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Journal articles on the topic 'Zn(II)'

Author: Grafiati

Published: 4 June 2021

Last updated: 1 February 2022

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1

Kimura, Eiichi, Tohru Koike, and Takeshi Shiota. "Zn(II)-metalloenzyme models by Zn(II)-macrocyclic polyamine complexes." Journal of Inorganic Biochemistry 36, no. 3-4 (August 1989): 305. http://dx.doi.org/10.1016/0162-0134(89)84464-2.

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2

Kandegedara, Ashoka, Saravanamuthu Thiyagarajan, Kalyan C. Kondapalli, Timothy L. Stemmler, and Barry P. Rosen. "Role of Bound Zn(II) in the CadC Cd(II)/Pb(II)/Zn(II)-responsive Repressor." Journal of Biological Chemistry 284, no. 22 (March 13, 2009): 14958–65. http://dx.doi.org/10.1074/jbc.m809179200.

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3

Chu, Qinghui, Doug A. Medvetz, Matthew J. Panzner, and Yi Pang. "A fluorescent bis(benzoxazole) ligand: Toward binuclear Zn(II)–Zn(ii) assembly." Dalton Transactions 39, no. 22 (2010): 5254. http://dx.doi.org/10.1039/c000989j.

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4

Peña, M. J., A. Arevalillo, I. Rucandio, and J. S. Jiménez. "Complex species of Zn(II) and Cu(II) in tris buffer solutions—I. Zn(II)." Electrochimica Acta 35, no. 3 (March 1990): 673–77. http://dx.doi.org/10.1016/0013-4686(90)87059-b.

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5

Santosa, Sri Juari, Narsito Narsito, and Aldes Lesbani. "SORPTION-DESORPTION MECHANISM OF Zn(II) AND Cd(II) ON CHITIN." Indonesian Journal of Chemistry 6, no. 1 (June 13, 2010): 47–51. http://dx.doi.org/10.22146/ijc.21772.

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This study reports the results of the elucidation of the sorption-desorption mechanism of Zn(II) and Cd(II) on chitin through the determination of capacity, energy, and rate constant of sorption as well as the investigation of their desorption properties in NaCl and Na2EDTA solutions. The chitin was isolated through deproteination followed by demineralization of crab (Portunus pelagicus Linn) shell using NaOH solutions. The sorption of both metal ions followed the Langmuir isotherm model, resulting the sorption capacities of 3.2 x 10-4 and 2.8 x 10-4 mol g-1 for Zn(II) and Cd(II), respectively, and sorption energies of 15.1 kJ mol-1 for Zn(II) and 17.9 kJ mol-1 for Cd(II). It was also observed that Zn(II) was sorbed slightly faster than Cd(II) with first order sorption rate constants of 2.82 x 10-3 min-1 for Zn(II) and 2.61 x 10-3 min-1 for Cd(II). The result of the desorption experiment showed that Cd(II) and especially Zn(II) could only be exchanged by Na(I) after desorbing those metal ions by strong chelating agent of EDTA2-. The easier desorption of Zn(II) than Cd(II) by EDTA2- must be attributed by the smaller sorption energy of Zn(II) and by harder acid property of Zn(II) than Cd(II) as EDTA2- contained hard electron donor elements. Keywords: sorption, desorption, chitin, Zn(II), Cd(II)

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6

Sobianowska-Turek, Agnieszka, Katarzyna Grudniewska, Paweł Maciejewski, and Małgorzata Gawlik-Kobylińska. "Removal of Zn(II) and Mn(II) by Ion Flotation from Aqueous Solutions Derived from Zn-C and Zn-Mn(II) Batteries Leaching." Energies 14, no. 5 (March 1, 2021): 1335. http://dx.doi.org/10.3390/en14051335.

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The Zn(II) and Mn(II) removal by an ion flotation process from model and real dilute aqueous solutions derived from waste batteries was studied in this work. The research aimed to determine optimal conditions for the removal of Zn(II) and Mn(II) from aqueous solutions after acidic leaching of Zn-C and Zn-Mn waste batteries. The ion flotation process was carried out at ambient temperature and atmospheric pressure. Two organic compounds used as collectors were applied, i.e., m-dodecylphosphoric acid 32 and m-tetradecylphosphoric 33 acid in the presence of a non-ionic foaming agent (Triton X-100, 29). It was found that both compounds can be used as collectors in the ion flotation for Zn(II) and Mn(II) removal process. Process parameters for Zn(II) and Mn(II) flotation have been established for collective or selective removal metals, e.g., good selectivity coefficients equal to 29.2 for Zn(II) over Mn(II) was achieved for a 10 min process using collector 32 in the presence of foaming agent 29 at pH = 9.0.

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7

Limphong, Pattraranee, Ross M. McKinney, Nicole E. Adams, Brian Bennett, Christopher A. Makaroff, Thusitha Gunasekera, and Michael W. Crowder. "Human Glyoxalase II Contains an Fe(II)Zn(II) Center but Is Active as a Mononuclear Zn(II) Enzyme." Biochemistry 48, no. 23 (June 16, 2009): 5426–34. http://dx.doi.org/10.1021/bi9001375.

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8

Blencowe, Dayle K., and Andrew P. Morby. "Zn(II) metabolism in prokaryotes." FEMS Microbiology Reviews 27, no. 2-3 (June 2003): 291–311. http://dx.doi.org/10.1016/s0168-6445(03)00041-x.

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9

Trojan, Miroslav, and Petra Šulcová. "The binary Cd(II)-Zn(II) cyclo-tetraphosphates." Thermochimica Acta 343, no. 1-2 (January 2000): 135–38. http://dx.doi.org/10.1016/s0040-6031(99)00340-8.

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10

Buhani, Buhani, and Suharso Suharso. "THE INFLUENCE OF pH TOWARDS MULTIPLE METAL ION ADSORPTION OF Cu(II), Zn(II), Mn(II), AND Fe(II) ON HUMIC ACID." Indonesian Journal of Chemistry 6, no. 1 (June 13, 2010): 43–46. http://dx.doi.org/10.22146/ijc.21771.

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Multiple metal ions adsorption of Cu(II), Zn(II), Mn(II) and Fe(II) on humic acid with a batch method has been carried out at pH interaction of 3, 5, and 6. Concentration of metal ions in solution before and after interaction was analyzed with Atomic Absorption Spectrophotometer (AAS). Result showed that adsorption multiple metal ions of Cu(II), Zn(II), Mn(II), and Fe(II) on humic acid is optimum at pH 5. Adsorption energies of the multiple metal ions Cu(II), Zn(II), Mn(II), and Fe(II) on humic acid at pH 3, 5, and 6 are around 35.0 - 37.6 kJ/mole. In general, capacity of competition adsorption of the multiple metal ions has an order as follows; Cu(II) < Fe(II) < Zn(II) < Mn(II). Keywords: Humic acid, adsorption, multiple metal

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11

Kapoor, Sudhir, and M. S. Sastry. "Redox reactions of peroxo terpyridine complexes of Cu(II), Zn(II), and Cu(II)?Zn(II): A pulse radiolysis study." International Journal of Chemical Kinetics 32, no. 2 (2000): 92–98. http://dx.doi.org/10.1002/(sici)1097-4601(2000)32:2<92::aid-kin4>3.0.co;2-n.

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12

Huo, Li-Hua, Shan Gao, and Seik Weng Ng. "Poly[bis[(pyridine-κN)zinc(II)](Zn—Zn)-μ4-carboxylatophenoxyacetato]." Acta Crystallographica Section E Structure Reports Online 61, no. 11 (October 12, 2005): m2254—m2255. http://dx.doi.org/10.1107/s1600536805031788.

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13

Ferenc, Wiesława, Dariusz Osypiuk, Jan Sarzyński, and Halina Głuchowska. "Complexes of Mn(II), Co(II), Ni(II), Cu(II) and Zn(II) with ligand formed by condensation reaction of isatin with glutamic acid." Eclética Química Journal 45, no. 3 (July 1, 2020): 12–27. http://dx.doi.org/10.26850/1678-4618eqj.v45.3.2020.p12-27.

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The complexes of Mn(II), Co(II), Ni(II), Cu(II) and Zn(II) with ligand (H2L=C13H12N2O5) formed by condensation reaction of isatin and glutamic acid were synthesized. Their physico-chemical properties were characterized using elemental analysis, XRF, XRD, FTIR, TG–DSC and TG–FTIR methods and magnetic measurements (Gouy’s and SQUID-VSM methods). The complexes were obtained in crystalline forms (monoclinic or triclinic) with the formulae: M(LH)2·nH2O for Mn(II), Ni(II) and Zn(II) and ML·nH2O for Co(II) and Cu(II), where LH=C13H11N2O5–, L-=C13H10N2O52–, n = 1 for Mn(II), Cu(II) and Zn(II), n = 2 for Co(II) and n = 3 for Ni(II). In air at 293–1173 K they decompose in three steps forming finally the oxides of the appropriate metals. The gaseous decomposition products were identified as: H2O, CO2, CO, hydrocarbons and N2O. The magnetic moment values for complexes (except Zn(II) complex) show their paramagnetic properties with the ferro- and antiferromagnetic interactions between central ions. The compounds of Mn(II) and Co(II) are high spin complexes with weak ligand field. In Co(II) and Cu(II) complexes two carboxylate groups take part in the metal ion coordination while in those of Mn(II), Ni(II) and Zn(II) only one carboxylate anion coordinates to central ion.

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14

Deswati, Deswati, Hamzar Suyani, and Safni Safni. "THE METHOD DEVELOPMENT OF ANALYSIS Cd, Cu, Pb AND Zn IN SEA WATER BY ABSORPTIVE STRIPPING VOLTAMMETRY (ASV) IN THE PRESENCE OF CALCON AS COMPLEXING AGENT." Indonesian Journal of Chemistry 12, no. 1 (February 14, 2012): 20–27. http://dx.doi.org/10.22146/ijc.21367.

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A sensitive and selective absorptive stripping voltammetric (AdSV) method to determine Cd(II), Cu(II), Pb(II) and Zn(II) in sea water is proposed. The aim of this study was to get optimum condition for the determination of Cd(II), Cu(II), Pb(II) and Zn(II). Absorptive stripping voltammetry has been used for ultra trace determination of Cd(II), Cu(II), Pb(II) and Zn(II) using calcon as a complexing agent (ligand). In this case, the optimum conditions were reached at 0.1 M KCl supporting electrolyte, concentration of 0.5 mM calcon for Cd(II), Cu(II) 0.3 mM while 0.7 mM for Pb(II) and Zn(II), pH 6 for Cu(II) and pH 7 for Cd(II), Pb(II) and Zn(II), accumulation potential -0.5 V for Cu(II) and Pb(II) and -0.6 V for Cd(II) and Zn(II) and accumulation time 70 sec for Cd(II), 90 sec for Cu(II) and Pb (II) while 50 s for Zn(II). At the optimum condition the relative standard deviations were 7.80%, 4.25%, 8.70% and 0.86% for Cd(II), Cu(II), Pb(II) and Zn(II) respectively for eight replicates (n = 8) measurements of 10 μg/L Cd(II), Cu(II), Pb(II) and Zn(II). The method was applied for the direct determination of Cd(II), Cu(II), Pb(II) and Zn(II) in sea water around Bungus, Padang City. Concentration Cd(II), Cu(II), Pb(II) and Zn(II) in sample were 13.200 μg /L for Cd(II), 17.200 μg/L for Cu(II), 0.089 μg/L for Pb(II) and 62.000 μg/L for Zn(II) with recovery of 98.68%, 97.99%, 96.17% and 99.96% for Cd(II), Cu(II), Pb(II) and Zn(II), respectively.

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15

Boscencu, Rica, Radu Socoteanu, Anabela Oliveira, and Vieira Ferreira. "Studies on Zn(II) monohydroxyphenyl mesoporphyrinic complexes: Synthesis and characterization." Journal of the Serbian Chemical Society 73, no. 7 (2008): 713–26. http://dx.doi.org/10.2298/jsc0807713b.

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A series of four Zn(II) complexes with asymmetrical porphyrinic ligands were synthesized: [5-(4-hydroxyphenyl)-10,15,20-triphenyl-21H,23H-porphinato]Zn(II) (Zn(II)TPPOHP), [5-(3-hydroxyphenyl)-10,15,20-triphenyl-21H,23H- -porphinato]Zn(II) (Zn(II)TPPOHM), [5-(2-hydroxyphenyl)-10,15,20-triphenyl- -21H,23H-Zn(II)-porphinato]Zn(II) (Zn(II)TPPOHO) and the well-known (5,10,15,20- -tetraphenyl-21H,23H-porphinato]Zn(II) (Zn(II)TPP) as reference, in a 1:1 mole ratio. In all cases, the free-base porphyrin served as a tetradentate ligand through the four pyrrole nitrogen atoms. The complexes were characterized by elemental analysis, FTIR and UV-Vis spectroscopy, which fully confirmed the structure of the complexes. UV-Vis showed that the spectral absorption of the four complexes was blue-shifted by at least 50 nm compared to that of the free ligands. Also important structural data were obtained from several different NMR experiments (including 1H-NMR, 13C-NMR, DEPT, COSY, HMBC and HMQC). Influences of external substituents on the porphyrin ring were observed. .

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16

Reyes, J. G., M. P. Arrate, M. Santander, L. Guzman, and D. J. Benos. "Zn(II) transport and distribution in rat spermatids." American Journal of Physiology-Cell Physiology 265, no. 4 (October 1, 1993): C893—C900. http://dx.doi.org/10.1152/ajpcell.1993.265.4.c893.

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Zn(II) is an essential trace element. In spermatozoa, Zn(II) modulates metabolism and chromatin condensation. The mechanisms of uptake and distribution of this ion in sperm cells have not been explored. In rat spermatids, our results indicate that 1) 65Zn(II) binds with fast kinetics to a labile, presumably extracellular, compartment. This binding is temperature insensitive and not modified by metabolic inhibitors. 2) Entry of 65Zn(II) in the absence of externally added proteins occurs through a mediated transport system that allows exchange to reach steady state in approximately 15 min at 34 degrees C. 3) Upon entering the cells, 65Zn(II) binds tightly to cellular organelles. 4) Exchangeable Zn(II) bound to cytoplasmic proteins plus free intracellular Zn(II) appears to be < 20% of total exchangeable Zn(II). 5) The intracellular exchangeable Zn(II) compartment is decreased by metabolic inhibitors, showing a direct or indirect link between energy metabolism and cellular Zn(II) levels. 6) 65Zn(II) efflux from rat spermatids is a process with a rate constant of 0.16 +/- 0.13 min-1 at 34 degrees C. This exit rate of Zn(II) is likely to be affected by Zn(II) release from cytoplasmic binding sites or organelles.

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17

Anderson, Oren P., Agnete la Cour, Andrew Dodd, Andrew D. Garrett, and Mark Wicholas. "Syntheses and Structures of Isoindoline Complexes of Zn(II) and Cu(II): An Unexpected Trinuclear Zn(II) Complex." Inorganic Chemistry 42, no. 1 (January 2003): 122–27. http://dx.doi.org/10.1021/ic011246n.

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18

Biswas, Ranjit Kumar, and Muhammad Saidur Rahman. "Kinetics of Partitioning of Zn(II) in Zn(II)/SO42−- BTMPPA/Kerosene and H2SO4- Zn-BTMPPA Complex/BTMPPA/Kerosene Systems." Solvent Extraction and Ion Exchange 31, no. 6 (October 2013): 652–67. http://dx.doi.org/10.1080/07366299.2013.787236.

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19

Lin, Yu‐Po, and J. Robert Selman. "Electrodeposition of Ni‐Zn Alloy: II . Electrocrystallization of Zn, Ni, and Ni‐Zn alloy." Journal of The Electrochemical Society 140, no. 5 (May 1, 1993): 1304–11. http://dx.doi.org/10.1149/1.2220975.

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20

Spinu, Cezar, Angela Kriza, Aurelia Meghea, and Cristian Tigae. "STUDIES ON N-[2-THIENYLMETHYLIDENE)-2-AMINOPYRIDINE COMPLEXES OF Fe(II), Co(II), Ni(II), Cu(II), Zn(II) AND Cd(II)." SOUTHERN BRAZILIAN JOURNAL OF CHEMISTRY 9, no. 10 (December 20, 2001): 17–22. http://dx.doi.org/10.48141/sbjchem.v9.n10.2001.20_2001.pdf.

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Metal complexes ML2Cl2, where M is Fe(II), Co(II), Ni(II), Cu(II), Zn(II) and Cd(II) and L is Schiff base formed by condensation of 2-thiophenecarboxaldehyde and 2-aminopyridine, N-[2-thienylmethylidene]-2-arninopyridine (TNAPY), have been prepared and characterized by elemental analysis, magnetic and spectroscopic measurements. IR and NMR spectra show that the nitrogen of the azomethyne group and the sulphur of the thiophene ring take part in coordination. Magnetic, ESR and electronic spectral studies show a distorted octahedral structure for the Fe(II), Co(II), Ni(II) and Cu(II) complexes and a tetrahedral geometry for the Zn(II) and Cd(II) complexes. Conductance measurements suggest the non-electrolytic nature of the complexes, with the exception of the Zn(TNAPY)2Cl2 and Cd(TNAPY)2Cl2 compounds which are 1:2 electrolytes.

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21

Journal, Baghdad Science. "sw uobaghdad edu iqSynthesis and Characterization of Mn(II), Co(II), Ni(II), Cu(II), Zn(II), and Hg(II) Complexes with Symmetrical Schiff base." Baghdad Science Journal 10, no. 3 (September 1, 2013): 618–26. http://dx.doi.org/10.21123/bsj.10.3.618-626.

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New binuclear Mn(II), Co(II), Ni(II), Cu(II), Zn(II), and Hg(II) Complexes of N2S2 tetradentate or N4S2 hexadentate symmetric Schiff base were prepared by the condensation of butane-1,4-diylbis(2-amino ethylcarbamodithioate) with 3-acetyl pyridine. The complexes having the general formula [M2LCl4] (where L=butane-1,4-diyl bis (2-(z)-1-(pyridine-3-ylethylidene amino))ethyl carbamodithioate, M= Mn(II), Co(II), Ni(II), Cu(II), Zn(II), and Hg(II)), were prepared by the reaction of the mentioned metal salts and the ligand. The resulting binuclear complexes were characterized by molar conductance, magnetic susceptibility ,infrared and electronic spectral measurements. This study indicated that Mn(II), Ni(II) and Cu(II) complexes have octahedral geometry, while Co(II) Zn(II) and Hg(II) complexes are proposed to be tetrahedral structure .K

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22

Zhao, Shixiang, Na Ta, and Xudong Wang. "Absorption of Cu(II) and Zn(II) from Aqueous Solutions onto Biochars Derived from Apple Tree Branches." Energies 13, no. 13 (July 7, 2020): 3498. http://dx.doi.org/10.3390/en13133498.

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The aim of this study was to investigate the adsorption of Cu(II) and Zn(II) onto apple tree branches biochar (BC) produced at 300, 400, 500 and 600 °C (BC300, BC400, BC500, and BC600), respectively. The effect of adsorbent dosage, pH value, contact time, initial concentration of Cu(II) or Zn(II), and temperature on the adsorption process were investigated. The result showed that 5 g BC·L−1 was the optimal dosage to remove Cu(II) and Zn(II) from wastewater and the maximum adsorption efficiency was achieved at a pH of 5.0 for all the BCs when the initial concentration of Cu(II) and Zn(II) were 64 and 65 mg L−1, respectively. Adsorption kinetics and isotherm experiments showed that the pseudo-second order equation and the Langmuir isotherm could best describe the adsorption process, indicating that the adsorption of Cu(II) and Zn(II) onto BCs were monolayer processes and chemisorption was the rate limiting step. The values of ΔG0 for the absorption of Cu(II) and Zn(II) on all BCs were negative, while the values of ΔH0 were positive, suggesting that the absorption was a spontaneous endothermic process. The mechanisms of BC adsorption of metal ions adsorption include surface precipitation, ion exchange, and minor contribution by cation-π interaction. BC500 had highest Cu(II) and Zn(II) adsorption capacity under various conditions (except at pH 2.0). The maximum adsorption capacities of Cu(II) and Zn(II) on BC500 were 11.41 and 10.22 mg·g−1, respectively. Therefore, BC derived from apple tree branches produced at 500 °C can be used as an adsorbent to remove Cu(II) and Zn(II) from wastewater.

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23

Chandra, S., Laveena Gupta, and Virendra P. Tyagi. "Co(II), Ni(II), Cu(II) and Zn(II) Complexes of Thiosemicarbazones." Synthesis and Reactivity in Inorganic and Metal-Organic Chemistry 26, no. 1 (January 1996): 125–37. http://dx.doi.org/10.1080/00945719608004251.

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24

Palma, Aniello, John F. Gallagher, Helge Müller-Bunz, Joanna Wolowska, Eric J. L. McInnes, and Donal F. O'Shea. "Co(ii), Ni(ii), Cu(ii) and Zn(ii) complexes of tetraphenylazadipyrromethene." Dalton Trans., no. 2 (2009): 273–79. http://dx.doi.org/10.1039/b811764k.

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25

Konstantinovic, Sandra, Blaga Radovanovic, Zoran Todorovic, and Slavica Ilic. "Spectrophotometric study of Co(II), Ni(II), Cu(II), Zn(II), Pd(II) and Hg(II) complexes with isatin-β-thiosemicarbazone." Journal of the Serbian Chemical Society 72, no. 10 (2007): 975–81. http://dx.doi.org/10.2298/jsc0710975k.

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The composition and stability of the complexes of isatin-?-thiosemicarbazone with Co(II), Ni(II), Cu(II), Zn(II), Pd(II) and Hg(II) have been investigated using spectrophotometric method at 30?C and constant ionic strength of 0.1 mol dm-3 (KNO3) in 70 % ethanol. Experimental results indicate the formation of MeL and MeL2 complexes for Ni(II) and Co(II), and MeL for Cu(II), Zn(II), Pd(II) and Hg(II) complexes, whose stability constants, ?n, have been calculated using a computerized iterative method of successive approximation.

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26

VAN HARLING, VINA N. "KUALITAS AIR TANAH BERDASARKAN KANDUNGAN TEMBAGA [Cu(II)], MANGAN [Mn(II)] DAN SENG [Zn(II)] DI DUSUN – DUSUN SEKITAR TEMPAT PEMBUANGAN AKHIR (TPA) SAMPAH NGRONGGO, SALATIGA." SOSCIED 1, no. 1 (July 13, 2018): 5. http://dx.doi.org/10.32531/jsoscied.v1i1.108.

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Penelitian tentang kualitas air tanah berdasarkan kandungan tembaga [Cu(II)], mangan [Mn(II)], dan seng [Zn(II)] di dusun - dusun sekitar Tempat Pembuangan Akhir (TPA) sampah Ngronggo, Salatiga. Data dianalisa di Laboratorium Kimia Lingkungan, Fakultas Sains dan Matematika, Universitas Kristen Satya Wacana, Salatiga. Tujuan dari penelitian ini adalah: Pertama, menentukan kualitas air sumur berdasarkan kandungan tembaga [Cu(II)], mangan [Mn(II)], dan seng [Zn(II)] dalam sumur di dusun – dusun sekitar TPA dalam radius kurang dari 1 km dan lebih dari 1 km ditelaah dengan PP No. 82 Tahun 2001. Kedua, menentukan tingkat pencemaran air sumur dengan menggunakan Indeks Pencemaran (IP). Contoh air sumur diambil dari 37 lokasi secara acak stratifikasi disproporsional di dusun – dusun sekitar TPA dalam radius kurang dari 1 km dan lebih dari 1 km. Data hasil analisis logam berat, parameter kimiawi dibandingkan dengan PP No. 82 Tahun 2001, sedangkan parameter fisiko dan bakteriologis dibandingkan dengan Keputusan MenKes RI No.907/MENKES/SK/VII/2002. Untuk menentukkan tingkat pencemaran air tanah digunakan Indeks Pencemaran (IP) berdasarkan keputusan Menteri Negara Lingkungan Hidup No.115 Tahun 2003. Hasil penelitian menunjukkan bahwa dalam radius kurang dari 1 km dari TPA Ngronggo, dari 15 sumur yang telah diteliti terdapat 6 sumur tercemar Cu(II), Mn(II) dan Zn(II) (40%), 3 sumur tercemar Cu(II)dan Mn(II) (20%). 3 sumur tercemar Mn(II) dan Zn(II)(20%), sedangkan 3 sumur yang lain hanya tercemar Zn(II) (20%). Selanjutnya dari ke 22 sumur yang telah diteliti dalam radius lebih dari 1 km dari TPA Ngronggo terdapat 4 sumur yang tercemar Cu(II), Mn(II) dan Zn(II) (18,18%), 10 sumur tercemar Mn(II) dan Zn(II) (45,45%), 2 sumur tercemar Cu(II)dan Zn(II) (9,09%), dan 6 sumur hanya tercemar Zn(II) (27,27%). Berdasarkan indeks pencemaran dari 37 sumur yang diteliti semua sumur berstatus cemar ringan (100%) baik yang berada dalam radius kurang dari 1 km maupun lebih dari 1 km

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27

Wierzba, Sławomir. "Biosorption of lead(II), zinc(II) and nickel(II) from industrial wastewater by Stenotrophomonas maltophilia and Bacillus subtilis." Polish Journal of Chemical Technology 17, no. 1 (March 1, 2015): 79–87. http://dx.doi.org/10.1515/pjct-2015-0012.

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Abstract The biosorption of Pb(II), Zn(II) and Ni(II) from industrial wastewater using Stenotrophomonas maltophilia and Bacillus subtilis was investigated under various experimental conditions regarding pH, metal concentration and contact time. The optimum pH values for the biosorption of the three metals were in the range 5.0-6.0, while the optimal contact time for the two bacterial species was 30 min. Experimental data was analyzed using Langmuir and Freundlich isotherms; the former had a better fit for the biosorption of Pb(II), Zn(II) and Ni(II). The maximum adsorption uptakes (qmax) of the three metals calculated from the Langmuir biosorption equation for S. maltophilia were 133.3, 47.8 and 54.3 for Pb(II), Zn(II) and Ni(II), respectively, and for B. subtilis were 166.7, 49.7 and 57.8 mg/g, respectively. B. subtilis biomass was more favorable for the biosorption of Pb (II) and Ni (II), while S. maltophilia was more useful for the biosorption of Zn (II).

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28

Mohammadi, Sayed Zia, Tayebeh Shamspur, Elham Shahsavani, and Samieh Fozooni. "Simultaneous Separation and Preconcentration of Trace Amounts of Cu(II), Ni(II), Zn(II), and Cd(II) with Modified Nanoporous Pumpellyite Zeolite." Journal of AOAC INTERNATIONAL 98, no. 3 (May 1, 2015): 828–33. http://dx.doi.org/10.5740/jaoacint.12-421.

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Abstract A procedure for determination of trace levels of Cu(II), Zn(II), Ni(II), and Cd(II) by flame atomic absorption spectrometry using a preconcentration system has been proposed. In this system, we used modified nanoporous pumpellyite zeolite loaded with 2-phenyl-4-[1-(2-thienyl) methylidene]-5-oxazolone as a sorbent for extracting Cu(II), Zn(II), Ni(II), and Cd(II) ions from real samples. Several parameters such as pH of the sample solution, amount of nanoporous pumpellyite zeolite, amount of ligand, volumes of sample and eluent, type of eluent, flow rates of sample and eluent, and the effects of diverse ions on the preconcentration were investigated. The LODs for Cu(II), Zn(II), Ni(II), and Cd(II) in the original solution were 2.6, 1.3, 3.2, and 1.1 ng/mL, respectively. The preconcentration factor was 250 for Zn and Ni, 100 for Cd, and 125 for Cu. The developed method was applied to the determination of trace metal ions in certified reference material tea leaves and water samples with satisfactory results.

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Putri, Antyka Lutfiana, Sri Sumarsih, and Harsasi Setyawati. "SINTESIS, KARAKTERISASI DAN UJI AKTIVITAS SENYAWA KOMPLEKS Zn(II)-KATEKIN SEBAGAI INHIBITOR ENZIM LIPASE." Jurnal Kimia Riset 4, no. 1 (June 30, 2019): 33. http://dx.doi.org/10.20473/jkr.v4i1.13154.

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ABSTRACT The study aims to synthesis, characterization and activity testing of Zn(II)-catechin as lipase inhibitor activity. The complex compound from synthesis result is characterized by its maximum wavelength, functional groups, metals and ligands bonds, and it’s melting point. This complex compound tested of Zn(II)-catechin as lipase inhibitor activity to p-NPP (para-nitrofenilpalmitat) substrate. The result shows that Zn(II)-catechin could be synthesized from Zn(II) ligans and metals with ratio ligands and metals mol is 1:1, that has maximum wavelength 454 nm, which contain Zn-O bond at 354,90 and 478,35 cm-1, and melting point of Zn(II)-catechin >250 oC. Zn(II)-catechin can inhibition 60,63% from concentration 50 µg/mL with mixed inhibition Keyword : Zn(II)-catechin, lipase, mixed inhibition ABSTRAK Penelitian ini bertujuan untuk melakukan sintesis, karakterisasi dan uji aktivitas senyawa kompleks Zn(II)-katekin terhadap aktivitas inhibitor enzim lipase. Senyawa kompleks hasil sintesis dikarakterisasi panjang gelombang maksimumnya, gugus fungsi serta ikatan logam dan ligannya, serta titik lelehnya. Senyawa kompleks diuji aktivitas inhibitor enzim lipase terhadap substrat p-NPP (paranitrofenilpalmitat). Hasil penelitian menunjukkan bahwa senyawa kompleks Zn(II)-katekin dapat disintesis dari ligan katekin dan logam Zn(II) dengan perbandingan mol ligan logam 1:1, mempunyai panjang gelombang maksimum 454 nm, mengandung ikatan Zn-O pada 354,90 dan 478,35 cm-1 dan titik leleh senyawa kompleks >250 oC. Senyawa kompleks Zn(II)-katekin pada konsentrasi 50µg/mL mempunyai daya inhinbisi sebesar 60,63% terhadap enzim lipase dengan jenis inhibisi campuran. Kata kunci : Zn(II)-katekin, lipase, inhibitor campuran

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30

Lavaee, Parirokh, Hossein Eshtiagh-Hosseini, Mohammad Reza Housaindokht, Joel T. Mague, Abbas Ali Esmaeili, and Khalil Abnous. "Synthesis, Characterization and Fluorescence Properties of Zn(II) and Cu(II) Complexes: DNA Binding Study of Zn(II) Complex." Journal of Fluorescence 26, no. 1 (November 4, 2015): 333–44. http://dx.doi.org/10.1007/s10895-015-1719-6.

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31

Thanh, Nguyen Mau, Nguyen Dinh Luyen, Tran Thanh Tam Toan, Nguyen Hai Phong, and Nguyen Van Hop. "Voltammetry Determination of Pb(II), Cd(II), and Zn(II) at Bismuth Film Electrode Combined with 8-Hydroxyquinoline as a Complexing Agent." Journal of Analytical Methods in Chemistry 2019 (July 3, 2019): 1–11. http://dx.doi.org/10.1155/2019/4593135.

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A novel method was developed for the simultaneous determination of Pb(II), Cd(II), and Zn(II) based on the cathodic stripping response at a bismuth film electrode associated with oxine as a chelating agent. The developed method provided a high and sharp electrochemical response compared with the method without oxine. A linear response of peak currents was observed for Pb(II), Cd(II), and Zn(II) concentration in the range from 2 ppb to 110 ppb. The detection limits of Pb(II), Cd(II), and Zn(II) were 0.45, 0.17, and 0.78 ppb, respectively. This method was successfully applied to the determination of Pb(II), Cd(II), and Zn(II) in lake-water and river-water samples. The metals were detected at the ultratrace level, showing the feasibility of the proposed method for environmental applications.

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32

Wu, H. B., and C. L. Tsou. "A comparison of Zn(II) and Co(II) in the kinetics of inactivation of aminoacylase by 1,10-phenanthroline and reconstitution of the apoenzyme." Biochemical Journal 296, no. 2 (December 1, 1993): 435–41. http://dx.doi.org/10.1042/bj2960435.

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The kinetics of reconstitution of apoacylase with either Zn(II) or Co(II) and the inactivation of the Co(II) reconstituted enzyme by 1,10-phenanthroline (OP) has been studied by following the substrate reaction continuously in presence of the metal ion or OP respectively. Although the native Zn(II)-containing and the Co(II)-reconstituted enzymes have closely similar Michaelis constants and maximal velocities, the kinetics for both the inactivation by OP and the reconstitution of the apoenzyme with the metal ions differs considerably. For Co(II), both the inactivation by OP and the reconstitution show simple kinetics, but for Zn(II), the inhibition by OP is a multi-phasic process [Wang, Wu, Wang, Zhou and Tsou (1992) Biochem. J. 281, 285-290], and the kinetics of reconstitution is also much more complicated. Both the native and the Co(II)-reconstituted enzymes are inhibited by excess of Zn(II), but not by Co(II). The inhibition by Zn(II) in excess and the reconstitution of the apoenzyme with Zn(II) are co-operative processes. The inhibition by Zn and its effect on the fluorescence emission of 1-anilinonaphthalene-8-sulphonic acid bound to the native enzyme indicate multiple Zn(II)-binding sites.

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33

Ajibade, Peter A., Fartisincha P. Andrew, Nandipha L. Botha, and Nolwazi Solomane. "Synthesis, Crystal Structures and Anticancer Studies of Morpholinyldithiocarbamato Cu(II) and Zn(II) Complexes." Molecules 25, no. 16 (August 6, 2020): 3584. http://dx.doi.org/10.3390/molecules25163584.

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Cu(II) and Zn(II) morpholinyldithiocarbamato complexes, formulated as [Cu(MphDTC)2] and [Zn(μ-MphDTC)2(MphDTC)2], where MphDTC is morpholinyldithiocarbamate were synthesized and characterized by elemental analysis, spectroscopic techniques and single-crystal X-ray crystallography. The molecular structure of the Cu(II) complex revealed a mononuclear compound in which the Cu(II) ion was bonded to two morpholinyl dithiocarbamate ligands to form a four-coordinate distorted square planar geometry. The molecular structure of the Zn(II) complex was revealed to be dinuclear, and each metal ion was bonded to two morpholinyl dithiocarbamate bidentate anions, one acting as chelating ligand, the other as a bridge between the two Zn(II) ions. The anticancer activity of the morpholinyldithiocarbamate ligand, Cu(II) and Zn(II) complexes were evaluated against renal (TK10), melanoma (UACC62) and breast (MCF7) cancer cells by a Sulforhodamine B (SRB) assay. Morpholinyldithiocarbamate was more active than the standard drug parthenolide against renal and breast cancer cell lines, and [Zn(μ-MphDTC)2(MphDTC)2] was the most active complex against breast cancer. The copper(II) complex had a comparable activity with the standard against renal and breast cancer cell lines but showed an enhanced potency against melanoma when compared to parthenolide.

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34

Yadav, M., and Debasis Behera. "Synthesis, Characterization, and Biological Activity of Mn(II), Fe(II), Co(II), Ni(II), Cu(II), Zn(II), and Cd(II) Complexes of N-Thiophenoyl-N′-Phenylthiocarbohydrazide." Journal of Chemistry 2013 (2013): 1–8. http://dx.doi.org/10.1155/2013/721397.

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Mn(II), Fe(II), Co(II), Ni(II), Cu(II), Zn(II), and Cd(II) complex of N-thiophenoyl -N′-phenylthiocarbohydrazide (H2TPTH) have been synthesized and characterized by elemental analysis, magnetic susceptibility measurements, infrared, NMR, electronic, and ESR spectral studies. The complexes were found to have compositions [Mn(H TPTH)2], [Co(TPTH) (H2O)2], [Ni(TPTH) (H2O)2], [Cu(TPTH)], [Zn(H TPTH)], [Cd(H TPTH)2], and [Fe(H TPTH)2(EtOH)]. The magnetic and electronic spectral studies suggest square planar geometry for [Cu(TPTH)], tetrahedral geometry for [Zn(TPTH)] and [Cd(H TPTH)2], and octahedral geometry for rest of the complexes. The infrared spectral studies of the 1 : 1 deprotonated complexes suggest bonding through enolic oxygen, thiolato sulfur, and both the hydrazinic nitrogens. Thus, H2TPTH acts as a binegative tetradentate ligand. H2TPTH and its metal complexes have been screened against several bacteria and fungi.

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35

Ur Rehman, Hanif, Gul Akhtar, Haroon Ur Rashid, Nauman Ali, Imtiaz Ahmad, Saeed Ur Rehman, Kamin Khan, and Muhammad Arshad. "Transport of Zn (II) by TDDA-Polypropylene Supported Liquid Membranes and Recovery from Waste Discharge Liquor of Galvanizing Plant of Zn (II)." Journal of Chemistry 2017 (2017): 1–9. http://dx.doi.org/10.1155/2017/7569354.

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The facilitated passage of Zn (II) across flat sheet supported liquid membrane saturated with TDDA (tri-n-dodecylamine) in xylene membrane phase has been investigated. The effect of acid and metal ion concentration in the feed solution, the carrier concentration in membrane phase, stripping agent concentration in stripping phase, and coions on the extraction of Zn (II) was investigated. The stoichiometry of the extracted species, that is, complex, was investigated on slope analysis method and it was found that the complex (LH)2·Zn(Cl2) is responsible for transport of Zn (II). A mathematical model was developed for transport of Zn (II), and the predicted results strongly agree with experimental ones. The mechanism of transport was determined by coupled coion transport mechanism with H+and Cl−coupled ions. The optimized SLM was effectively used for elimination of Zn (II) from waste discharge liquor of galvanizing plant of Zn (II).

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36

Andjelkovic, Katarina, Gordana Jakovljevic, Mario Zlatovic, Zivoslav Tesic, Dusan Sladic, Jonas Howing, and Roland Tellgren. "Synthesis and characterization of zinc(II), palladium(II) and platinum(II) complexes with 2’-[1-(2-pyridinyl)- ethylidene]oxamohydrazide: The crystal structure of biss2'-[1-(2-pyridinyl)ethylidene]oxa." Journal of the Serbian Chemical Society 69, no. 8-9 (2004): 651–60. http://dx.doi.org/10.2298/jsc0409651a.

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Complexes of Zn(II), Pd(II) and Pt(II) with 2?-[1-(2-pyridinyl)ethylidene ]oxamohydrazide (Hapsox) were synthesized and their structures were determined. All the complexes are of a neutral type with two apsox ligands coordinated to Zn(II) and one apsox ligand coordinated to Pd(II) or Pt(II). In each case, the polydentate was coordinated via pyridine and hydrazone nitrogens and ?-oxyazine oxygen, forming an octahedral geometry around Zn(II), and a square planar one around Pd(II) and Pt(II). The structure determination was performed by IR, 1H-NMR and 13C-NMR spectroscopy, and for the Zn(II) complex by X-ray structure analysis.

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37

Setyawati, Harsasi. "SINTESIS DAN KARAKTERISASI SENYAWA KOMPLEKS Zn(II)-EDTA SEBAGAI SENAYAWA ANTIALGA PADA COOLING WATER INDUSTRI." Jurnal Kimia Riset 2, no. 1 (June 13, 2017): 43. http://dx.doi.org/10.20473/jkr.v2i1.3689.

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ABSTRACTA research on the synthesis and characterization of complex compounds of Zn (II)-EDTA as antialgae compound is applied to the cooling water industry. This research aims to determine the activity of complex compounds of Zn (II)-EDTA against algae that live in the water cooling water. The activity antialgae assay of comple compound of Zn(II)-EDTA with luminescence method and dry cell weight method. Complex compound of Zn (II)-EDTA made with mole ratio of ZnCl2: Na2EDTA is 1:1. Complex compound of Zn (II)-EDTA analyzed using UV-Vis spectrophotometer and FTIR spectrophotometer. The results of UV-Vis spectrophotometer analysis showed that the complex compounds of Zn (II)-EDTA has a maximum wavelength at 752 nm. While the results of FTIR analysis showed Zn-O vibration absorption at wave number 478.35 cm-1 and Zn-N vibration absorption at wave number 516.92 cm-1. In the activity antialgae assay of complex compound of Zn (II)-EDTA made with a concentration of 5 ppm, 10 ppm, 50 ppm and 100 ppm. The test results showed that the activity of complex compounds of Zn (II) -EDTA can kill green algae and brown algae. Of the four concentrations of complex compounds of Zn (II)-EDTA, green algae and brown algae can be killed optimally at a concentration of 50 ppm.Keywords: complex Zn(II)-EDTA, cooling water, antialgae, green algae, brown algae

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38

Paira, M. K., J. Dinda, T. H. Lu, A. R. Paital, and C. Sinha. "Zn(II), Cd(II) and Hg(II) complexes of 8-aminoquinoline." Polyhedron 26, no. 15 (September 2007): 4131–40. http://dx.doi.org/10.1016/j.poly.2007.05.021.

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39

Oktavec, Drahomír, Jozef Lehotay, Viktor Vrábel, and Elena Korgová. "Extraction of Dithiocarbamate Chelates of Ni(II), Cu(II), Zn(II)." Collection of Czechoslovak Chemical Communications 61, no. 5 (1996): 673–80. http://dx.doi.org/10.1135/cccc19960673.

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Extraction has been investigated of chelates of alkali salts of dithiocarbamic (DTC) acids derived from (R-) dimethyl-, diethyl-, dipropyl-, diisopropyl-, dibutyl-, diisobutyl-, dipentyl-, and dihexylamine, piperidine, and morpholine with Ni(II), Cu(II), and Zn(II) from aqueous solutions of various pH values into chloroform for various time intervals. The optimum conditions have been determined for the maximum extraction yields of the metal connected with the minimum extraction yields of excess DTC ligand. The extraction of DTC chelates of Ni(II), Cu(II), and Zn(II) is best accomplished in a reaction period of 4.5 min in strong acid region (Ni, Cu) or in alkaline region with buffers of pH 8.5-9.0 (Zn). The advantage of DTC as compared with many other reagents lies in the possibility of quantitative extraction of Ni(II) and Cu(II) from strong acid media since in this region the excess DTC ligand is completely decomposed to carbon disulfide and amine in short time, and thus it does not interfere with the subsequent spectrophotometric determination.

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40

Ramírez, Araceli, María Luisa Gómez, Alejandro Guerrero, and Antonio Jerez. "Thermal decomposition of Co(II), Cu(II) AND Zn(II) methanesulfonates." Thermochimica Acta 124 (February 1988): 9–16. http://dx.doi.org/10.1016/0040-6031(88)87002-3.

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41

Wang, M., H. Jiang, and Z. C. Wang. "Dehydration studies of Co(II), Cu(II) and Zn(II) methanesulfonates." Journal of Thermal Analysis and Calorimetry 85, no. 3 (May 16, 2006): 751–54. http://dx.doi.org/10.1007/s10973-005-7064-2.

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42

Li, Hongchuan, Rui Jin, Hongxiang Hu, Yusef Kianpoor Kalkhajeh, Yingying Zhao, Yue Gao, and Borui Zhang. "Adsorption of As(III), Pb(II), and Zn(II) from Wastewater by Sodium Alginate Modified Materials." Journal of Analytical Methods in Chemistry 2021 (September 23, 2021): 1–11. http://dx.doi.org/10.1155/2021/7527848.

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Sodium alginate (SA), polyvinyl oxide (PEO), and ceramic nanomaterials were used to prepare alginate composite gel. The present study examined the removal rate and adsorption capacity of alginate composite gel for removal of wastewater As(III), Pb(II), and Zn(II). Batch experiments were conducted to study the influence of experimental parameters such as pH and temperature, as well as the mechanism of As(III), Pb(II), and Zn(II) adsorption with the new adsorbent. The results showed the high efficiency of sodium alginate composite gel for removal of wastewater As(III), Pb(II), and Zn(II). Under the condition of the best liquid-solid ratio and the contact time, the removal rates of As(III), Pb(II), and Zn(II) were 67.42%, 95.31%, and 93.96%, respectively. The pseudo-second-order kinetic equation was superior to fit the adsorption kinetics process. The isothermal adsorption models of As(III) and Pb(II) fitted well with the Freundlich model, and Zn(II) fitted well with the Langmuir model. The results of SEM, EDS, XPS, and FTIR analyses revealed that the adsorption process occurred mainly via chemisorption. The results of the present study suggest that new adsorbents can be effectively utilized for As(III), Pb(II), and Zn(II) removal from water.

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43

Motoyama, Yukihiro, and Hisao Nishiyama. "ChemInform Abstract: Mg(II) and Zn(II) Lewis Acids." ChemInform 33, no. 20 (May 21, 2010): no. http://dx.doi.org/10.1002/chin.200220272.

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44

Hensley, M. Patrick, David L. Tierney, and Michael W. Crowder. "Zn(II) Binding toEscherichia coli70S Ribosomes." Biochemistry 50, no. 46 (November 22, 2011): 9937–39. http://dx.doi.org/10.1021/bi200619w.

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45

Pucci, Daniela, Alessandra Crispini, Mauro Ghedini, Massimo La Deda, Paola F. Liguori, Claudio Pettinari, and Elisabeta I. Szerb. "“Green light” for Zn(ii) mesogens." RSC Advances 2, no. 24 (2012): 9071. http://dx.doi.org/10.1039/c2ra20700a.

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46

Kushvaha, Saroj Kumar, Bhaskaran Shankar, N. V. T. Sai Manoj Gorantla, and Kartik Chandra Mondal. "A Fluorescent Hexanuclear Zn(II) Complex." ChemistrySelect 4, no. 12 (March 25, 2019): 3334–39. http://dx.doi.org/10.1002/slct.201803745.

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47

Bal, Wojciech, Henryk Kozlowski, Elzbieta Masiukiewicz, Barbara Rzeszotarska, and Imre Sóvágó. "LHRH interaction with Zn(II) ions." Journal of Inorganic Biochemistry 37, no. 2 (October 1989): 135–39. http://dx.doi.org/10.1016/0162-0134(89)80036-4.

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48

Singer, D. M., F. Farges, and G. E. Brown. "Zn(II) sorption on nanoparticulate UO2." Geochimica et Cosmochimica Acta 70, no. 18 (August 2006): A592. http://dx.doi.org/10.1016/j.gca.2006.06.1099.

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49

Deng, Hua, Qiuyan Li, Meijia Huang, Anyu Li, Junyu Zhang, Yafen Li, Shuangli Li, Caiyan Kang, and Weiming Mo. "Removal of Zn(II), Mn(II) and Cu(II) by adsorption onto banana stalk biochar: adsorption process and mechanisms." Water Science and Technology 82, no. 12 (November 10, 2020): 2962–74. http://dx.doi.org/10.2166/wst.2020.543.

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Abstract Low-cost banana stalk (Musa nana Lour.) biochar was prepared using oxygen-limited pyrolysis (at 500 °C and used), to remove heavy metal ions (including Zn(II), Mn(II) and Cu(II)) from aqueous solution. Adsorption experiments showed that the initial solution pH affected the ability of the biochar to adsorb heavy metal ions in single- and polymetal systems. Compared to Mn(II) and Zn(II), the biochar exhibited highly selective Cu(II) adsorption. The adsorption kinetics of all three metal ions followed the pseudo-second-order kinetic equation. The isotherm data demonstrated the Langmuir model fit for Zn(II), Mn(II) and Cu(II). The results showed that the chemical adsorption of single molecules was the main heavy metal removal mechanism. The maximum adsorption capacities (mg·g−1) were ranked as Cu(II) (134.88) > Mn(II) (109.10) > Zn(II) (108.10)) by the single-metal adsorption isotherms at 298 K. Moreover, characterization analysis was performed using Fourier transform infrared spectroscopy, the Brunauer-Emmett-Teller method, scanning electron microscopy with energy-dispersive X-ray spectroscopy, X-ray diffraction, and X-ray photoelectron spectroscopy. The results revealed that ion exchange was likely crucial in Mn(II) and Zn(II) removal, while C-O, O-H and C = O possibly were key to Cu(II) removal by complexing or other reactions.

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50

Hino, Shiori, Moe Maeda, Kei Yamashita, Yumiko Kataoka, Motohiro Nakano, Tomoo Yamamura, Hiroyuki Nojiri, Maiko Kofu, Osamu Yamamuro, and Takashi Kajiwara. "Linear trinuclear Zn(ii)–Ce(iii)–Zn(ii) complex which behaves as a single-molecule magnet." Dalton Transactions 42, no. 8 (2013): 2683. http://dx.doi.org/10.1039/c2dt32812g.

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