Academic literature on the topic 'Zn-EDTA'
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Journal articles on the topic "Zn-EDTA"
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Setyawati, Harsasi. "SINTESIS DAN KARAKTERISASI SENYAWA KOMPLEKS Zn(II)-EDTA SEBAGAI SENAYAWA ANTIALGA PADA COOLING WATER INDUSTRI." Jurnal Kimia Riset 2, no. 1 (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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Elad, Yigal, Ziv Nisan, Ziv Kleinman, Dalia Rav-David, and Uri Yermiyahu. "Effects of Microelements on Downy Mildew (Peronospora belbahrii) of Sweet Basil." Plants 10, no. 9 (2021): 1793. http://dx.doi.org/10.3390/plants10091793.
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We recently demonstrated that spraying or irrigating with Ca, Mg and K reduces the severity of sweet basil downy mildew (SBDM). Here, the effects of Mn, Zn, Cu and Fe on SBDM were tested in potted plants. The effects of Mn and Zn were also tested under semi-commercial and commercial-like field conditions. Spray applications of a mixture of EDTA-chelated microelements (i.e., Fe-EDTA, Mn-EDTA, Zn-EDTA, Cu-EDTA and Mo) reduces SBDM severity. The application of EDTA chelates of individual microelements (i.e., Fe-EDTA, Mn-EDTA and Zn-EDTA) significantly reduces SBDM in potted plants. Foliar applications of Mn-EDTA and Zn-EDTA are found to be effective under semi-commercial conditions and were, thus, further tested under commercial-like conditions. Under commercial-like conditions, foliar-applied Mn-EDTA and Zn-EDTA decreased SBDM severity by 46–71%. When applied through the irrigation solution, those two microelements reduce SBDM by more than 50%. Combining Mg with Mn-EDTA and Zn-EDTA in the irrigation solution does not provide any additional disease reduction. In the commercial-like field experiment, the microelement-mixture treatment, applied as a spray or via the irrigation solution, was combined with fungicides spray treatments. This combination provides synergistic disease control. The mode of action in this plant–pathogen system may involve features of altered host resistance.
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Nugegoda, D., and P. S. Rainbow. "Effect of a chelating agent (EDTA) on zinc uptake and regulation by Palaemon elegans (Crustacea: Decapoda)." Journal of the Marine Biological Association of the United Kingdom 68, no. 1 (1988): 25–40. http://dx.doi.org/10.1017/s0025315400050074.
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The littoral prawn Palaetnon elegans Rathke regulates the body concentration of zinc at higher external zinc concentrations in the presence of EDTA. The dissolved zinc concentration in artificial sea water corresponding to the threshold of regulation breakdown changed from ca. 100 μg Zn 1-1 (ca. 1.53 μmol Zn 1-1) without EDTA, to ca. 316 μg Zn 1-1 (ca. 4.8 μmo1 Zn 1-1) in the presence of 8.6μmol EDTA 1-1 at 10 °C. The regulated body Zn concentration remained unchanged at 77–79 μg Zn g-1 dry wt with or without EDTA. Increased levels of EDTA in the medium decreased the rate of uptake of labelled zinc by P. elegans. The presence of 3 μmol EDTA 1-1 decreased the mean Zn uptake rate of prawns in 100 fig Zn 1-1 (ca. 1.53 μmol Zn 1-1) from 2.9 to 0.25% of total body Zn g-1 day"1 at 10 °C. The increased ability of P. elegans to regulate zinc in the presence of EDTA may be explained by the reduced bioavailability of the zinc-EDTA complex for uptake. There is marked individual variation in the rate of uptake of labelled zinc in prawns, even in the presence of the same concentration of zinc or zinc-EDTA.
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Heerema, Richard J., Dawn VanLeeuwen, Marisa Y. Thompson, Joshua D. Sherman, Mary J. Comeau, and James L. Walworth. "Soil-application of Zinc-EDTA Increases Leaf Photosynthesis of Immature ‘Wichita’ Pecan Trees." Journal of the American Society for Horticultural Science 142, no. 1 (2017): 27–35. http://dx.doi.org/10.21273/jashs03938-16.
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Zinc deficiency is common in pecan (Carya illinoinensis) grown in alkaline, calcareous soils. Zinc (Zn)-deficient pecan leaves exhibit interveinal chlorosis, decreased leaf thickness, and reduced photosynthetic capacity. Low photosynthesis (Pn) contributes to restricted vegetative growth, flowering, and fruiting of Zn-deficient pecan trees. Our objectives were to measure effects of soil-applied ethylenediaminetetraacetic acid (EDTA)-chelated Zn fertilizer on gas exchange of immature ‘Wichita’ pecan and characterize the relationship between leaf Zn concentration and Pn. The study orchard had alkaline and calcareous soils and was planted in Spring 2011. Zinc was applied throughout each growing season as Zn EDTA through microsprinklers at rates of 0 (Control), 2.2, or 4.4 kg·ha−1 Zn. Leaf gas exchange and SPAD were measured on one occasion in the 2012 growing season, four in 2013, and five in 2014. Soil Zn-EDTA applications significantly increased the leaf tissue Zn concentration throughout the study. On all measurement occasions, net Pn was significantly increased by soil-applied Zn EDTA compared with the control, but Pn was not different between the two soil-applied Zn-EDTA treatments. Leaf Pn in midseason did not increase at leaf tissue Zn concentrations above 14–22 mg·kg−1. Leaf SPAD consistently followed a similar pattern to Pn. Soil Zn-EDTA application increased leaf stomatal conductance (gS) compared with the Control early through midseason but not after August. Intercellular CO2 concentration was significantly lower for Zn-EDTA-treated trees than the Control even on dates when there was no significant difference in gs, which suggests that soil application of Zn-EDTA alleviated nonstomatal limitations to Pn caused by Zn deficiency.
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Hurrell, Richard F., Sandra Ribas, and Lena Davidsson. "NaFe3+EDTA as a food fortificant: influence on zinc, calcium and copper metabolism in the rat." British Journal of Nutrition 71, no. 1 (1994): 85–93. http://dx.doi.org/10.1079/bjn19940113.
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The general acceptance of NaFe3+EDTA for food Fe fortification has been partly restricted by concern over the influence of EDTA on the metabolism of other nutritionally important trace elements and minerals. We have investigated the influence of NaFe3+EDTA, and of increasing dietary levels of Na2EDTA, on Zn, Cu and Ca metabolism in rats fed on Zn-sufficient and Zn-deficient soya-bean-isolate- based diets. With the Zn-deficient diets, changing the dietary Fe compound from FeSO4 to NaFe3+- EBTA significantly (P < 0·05) increased mean apparent Zn absorption from 50·2 to 67·4%. urinary Zn excretion from 2·0 to 4·0% of intake, and Zn retention from 48·2 to 63·4%. Increasing the dietary EDTA level to 1000 mg/kg further increased Zn absorption to 78·1%, urinary Zn excretion to 15·6% of intake and Zn retention to 62·5%. Increased Zn retention was accompanied by a significant increase in weight gain indicating that the extra Zn was available for normal metabolic processes. With rats fed on the Zn-sufficient diet, NaFe3+EDTA and Na2EDTA similarly increased the absorption, urinary excretion and retention of Zn but to a lesser extent. NaFe3+EDTA, however, had no influence on the absorption, urinary excretion and retention of Cu and Ca, and additional Na2EDTA caused only minor increases in Cu absorption and retention and in the urinary excretion of Ca. We conclude that using NaFe3+EDTA as a food fortificant would have no detrimental effect on the metabolism of Zn, Cu and Ca and, in some situations, could improve Zn absorption and retention from low-bioavailability diets.
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Gonzalez, Demetrio, Patricia Almendros, and Jose M. Alvarez. "Effects of synthetic Zn chelates on flax response and soil Zn status." Spanish Journal of Agricultural Research 14, no. 3 (2016): e1104. http://dx.doi.org/10.5424/sjar/2016143-8765.
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Throughout the world, flax (Linum usitatissimum L.) is often grown in Zn-deficient soils, but appropriate fertilizer management can optimize both crop yield and micronutrient content. A greenhouse experiment was conducted on Typic Haploxeralf (pH 6.1) and Typic Calcixerept (pH 8.1) soils to study the relative efficiency of chelated Zn using two application rates of three different Zn sources [Zn-EDDHSA, ethylenediamine-di-(2-hydroxy-5-sulfophenylacetate of Zn); Zn-HEDTA, N-2-hydroxyethyl-ethylenediaminetriacetate of Zn; and Zn-EDTA, ethylenediaminetetraacetate of Zn]. Dry matter /DM) yield, Zn concentration, chlorophyll content, crude fiber and tensile properties were monitored and the soil-Zn status (available-Zn, Zn-fractions and total-Zn) was assessed. Zinc chelate applications increased the most labile forms of Zn in soils and Zn concentrations in plants. The low rate of Zn generally had a beneficial effect on DM yield and tensile properties. The exception was Zn-EDTA in the weakly acidic soil, where the highest Zn concentrations were observed in leaves and whole shoots; this coincided with the largest concentrations of labile Zn in soil. The most efficient fertilizers were Zn-EDDHSA (in both soils) and Zn-EDTA (in the calcareous soil). The relatively large amounts of labile and available Zn present in both of the soils fertilized with Zn-EDTA points to the applying this chelate at lower rate than 5 mg Zn/kg; this should, in turn, reduce the cost of Zn fertilization and minimize environmental pollution risk.
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Smith, Cyrus A., James L. Walworth, Mary J. Comeau, Richard J. Heerema, and Joshua D. Sherman. "Does Foliar Zinc Application Boost Leaf Photosynthesis of ‘Wichita’ Pecan Fertigated with Zinc-EDTA?" HortScience 56, no. 5 (2021): 579–82. http://dx.doi.org/10.21273/hortsci15692-21.
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Many growers fertigating their orchards with zinc–ethylenediaminetetraacetic acid (Zn-EDTA) are still using supplemental zinc foliar sprays because of a lack of confidence that soil-applied Zn-EDTA is supplying enough Zn to the trees. A field study was conducted in a pecan orchard located near San Simon, AZ, on 8-year-old ‘Wichita’ trees growing in an alkaline, calcareous Vekol loam soil to evaluate the effectiveness of supplemental foliar Zn sprays. All trees were fertigated with 6.0 kg⋅ha–1 Zn in the form of Zn-EDTA in 2018 and 11.0 kg⋅ha–1 Zn in 2019 and did not exhibit visible signs of Zn deficiency. Foliar treatments of 3.75 mL⋅L–1 urea–ammonium nitrate (UAN), 3.6 g⋅L–1 zinc sulfate monohydrate (ZnSO4·H2O), 3.6 g⋅L–1 ZnSO4·H2O with 3.75 mL⋅L–1 UAN, 11 mL⋅L–1 Zn-EDTA, and water alone were applied to individual fruiting shoot terminals of trees on two dates each in 2018 and 2019. Treatments were sprayed directly onto the leaves of the selected terminals. Zn-EDTA was included as a foliar treatment in 2019 only. Leaf photosynthesis was measured to determine the impact of leaf Zn concentrations on plant function. Midday stem water potential (MDSWP) was measured to verify that water stress was not limiting photosynthesis. Both measurements were taken about 2 to 4 weeks after the application of foliar treatments. MDSWP measurements indicated a lack of water stress and therefore no effect on photosynthesis. Leaf samples collected from untreated branches indicated that the average foliar Zn concentration of untreated leaves was 21.3 mg⋅kg–1 in 2018 and 15.7 mg⋅kg–1 in 2019. No differences were observed in photosynthesis rates of treated branches. No additional benefit to leaf photosynthetic function or appearance was observed from spraying Zn on foliage of trees fertigated with Zn-EDTA.
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Stover, Ed, Michael Fargione, Richard Risio, Warren Stiles, and Kevin Iungerman. "Prebloom Foliar Boron, Zinc, and Urea Applications Enhance Cropping of Some `Empire' and `McIntosh' Apple Orchards in New York." HortScience 34, no. 2 (1999): 210–14. http://dx.doi.org/10.21273/hortsci.34.2.210.
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This study was initiated to determine if prebloom sprays of B, Zn, and urea would enhance cropping of apple (Malus×domestica Borkh.) after cold injury, hypothesizing that they may accelerate recovery of damaged vascular tissue. The following foliar nutrient treatments were applied prebloom to `McIntosh' and `Empire' trees at two sites in 1994 and 1995: 1) control; 2) B (22.8 mm) at half-inch-green; 3) Zn-EDTA (0.75 mm) at half-inch-green; 4) B and Zn-EDTA at half-inch-green; 5) B, Zn-EDTA, and urea (59.4 mm) at half-inch-green; 6) B and Zn-EDTA at half-inch-green, followed by B, Zn-EDTA, and urea at pink. In 1994, following a very severe winter that caused visible damage to vascular tissue, `Empire' at both sites cropped more heavily following all treatments that included both B and Zn; such treatments increased cropload by an average of 22% and 35% at the two test sites. Despite a mild winter preceding the 1995 season, prebloom nutrient treatments again increased cropping of `Empire'. In 1996, treatments included a control and a single foliar treatment (B + Zn-EDTA at half-inch-green followed by B, Zn-EDTA, and urea at pink) on `McIntosh' and `Empire' at seven orchard sites. Treatment enhanced cropping in `McIntosh' at three of the seven sites, but there was no effect on `Empire'. Factors influencing differences in response were not apparent from this study, although a complex of factors may be involved. Data for all years indicated that prebloom nutrients did not enhance spur leaf development or fruit set; such treatments probably enhance cropping by increasing retention of flower buds that would otherwise abscise before anthesis. Where cropping was increased, mean fruit weight was not reduced at P ≤ 0.05 but fruit weight was significantly less at P ≤ 0.10 in 1995. Chemical names used: boron (Solubor, disodium octaborate tetrahydrate); zinc (Zn-EDTA, zinc chelate).
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HAYNES, R. J. "Micronutrient status of a group of soils in Canterbury, New Zealand, as measured by extraction with EDTA, DTPA and HCl, and its relationship with plant response to applied Cu and Zn." Journal of Agricultural Science 129, no. 3 (1997): 325–33. http://dx.doi.org/10.1017/s0021859697004735.
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The Cu, Zn and Mn status of 44 fields from the Canterbury region of New Zealand under winter wheat was investigated in Spring 1993. Micronutrient status was assessed using EDTA, DTPA and HCl as extractants. The Mn status of soils was generally high and unaffected by soil development. However, when samples were separated according to soil series, it was found that extractable Cu and Zn levels in both the 0–15 and 15–30 cm soil layers generally decreased with increasing soil development (increasing soil age and annual rainfall). Twenty-three percent of fields had EDTA-extractable Cu levels <1 μg g−1 whilst 34% had EDTA-extractable Zn levels <1 μg g−1.Twenty-two of the soils were used in a glasshouse experiment in which wheat was grown in the soils with or without the addition of added Cu and/or Zn. Plant dry matter responses to added Cu were recorded in soils with extractable Cu levels <1·1 μg g−1 EDTA, 0·4 μg g−1 DTPA and 0·9 μg g−1 HCl. Responses to added Zn occurred in soils with extractable Zn levels <0·8 μg g−1 EDTA, 0·25 μg g−1 DTPA and 1·4 μg g−1 HCl. Significant linear correlations were found between EDTA-, DTPA- and HCl-extractable Cu and Zn and Cu and Zn uptake respectively by wheat. Correlation coefficients were closer for Cu than for Zn uptake. It was concluded that many sites on the more strongly developed soils of the Canterbury Plains are potentially deficient in Cu and/or Zn and that these can be identified using conventional micronutrient soil tests.
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Mahatmanti, F. Widhi. "Pengaruh Derajad Keasaman (pH) pada Kesetimbangan Kompleks Zn(II)-EDTA oleh Adsorben Kitosan." Jurnal Kimia Sains dan Aplikasi 7, no. 2 (2004): 50–54. http://dx.doi.org/10.14710/jksa.7.2.50-54.
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Telah dilakukan penelitian tentang pengaruh derajad keasaman (pH) terhadap kesetimbangan kompleks Zn(II)-EDTA oleh adsorben kitosan. Adsorpsi oleh adsorben kitosan dilakukan pada pH buffer 2-10 dengan wak-tu interaksi 3 hari. Analisis hasil Zn(II)-EDTA yang teradsorpsi digunakan Spektroskopi Serapan Atom (AAS). Hasil penelitian menunjukkan bahwa pada pH = 6, khelat Zn(II)-EDTA mayoritas terdapat dalam dalam bentuk ZnL2- sehingga akan berinteraksi dengan kitosan melalui interaksi elektrostatik menurut persamaan reaksi: RcNH3+ + ZnL2- menjadi RcNH3+ ZnL2-.
Dissertations / Theses on the topic "Zn-EDTA"
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Costa, Roberto Savério Souza [UNESP]. "Aplicação de quelatos de zinco em um solo deficiente cultivado com milho em casa de vegetação." Universidade Estadual Paulista (UNESP), 2008. http://hdl.handle.net/11449/96935.
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costa_rss_me_jabo.pdf: 196990 bytes, checksum: c75125a9aa5fdd7fdef314a312cabaed (MD5)<br>Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)<br>O zinco é um micronutriente considerado limitante à produção do milho no Brasil, sendo a sua deficiência muito comum em todas as regiões do país. Com o objetivo de avaliar os efeitos de doses e fontes de Zn nas concentrações do micronutriente no solo, na planta e na produção de matéria seca da parte aérea do milho, foi conduzido um experimento em casa de vegetação, empregando-se amostra de um Latossolo Vermelho textura média. O delineamento experimental foi inteiramente casualizado, com três repetições, segundo um arranjo fatorial 6 x 3 (seis doses de Zn e três fontes). Foram empregadas as seguintes doses de Zn: 0; 0,5; 1; 2; 4 e 6 mg kg-1, utilizando-se as fontes: Zn-EDTA, Zn-lignosulfonato (Zn-LS) e sulfato de zinco. Verificou-se que a aplicação de Zn, independentemente da fonte considerada, aumentou significativamente a produção de matéria seca da parte aérea de milho e as concentrações do micronutriente no solo e na planta. A fonte Zn-LS proporcionou concentrações de Zn no solo e na planta significativamente superiores, particularmente em relação à fonte inorgânica. As fontes de Zn apresentaram um comportamento semelhante em termos de produção de matéria seca. Os níveis críticos de Zn no solo e na parte aérea da planta foram respectivamente, 0,9 e 16 mg kg-1.<br>The zinc is a micronutrient that limits the production of the maize in Brazil, being its very common deficiency in all the regions of the country. With the objective of evaluating the effect of the zinc rates in micronutrients concentration in soil, in plants and maize shoot dry matter production, an experiment in pots containing Haplustox (Latossolo Vermelho). It was used a complete randomized design, with three replications of treatments, in a factorial arrangement 6 x 3 (six rates of zinc and three sources). It was used following rates of zinc: 0; 0.5; 1; 2; 4 e 6 mg kg-1, and sources: Zn-EDTA, Zn-lignosulfonate (Zn-LS) and zinc sulfate. It was observed zinc application, own the sources, increased corn shoot dry matter and the micronutrient concentration in soil and plant. The source Zn-LS provided more Zn concentration in soil and plant than inorganic source. The zinc sources showed the same performance in dry matter production. The Zn level critic in soil and plant were respectively 0.9 mg kg-1 and 16 mg kg-1.
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Costa, Roberto Savério Souza. "Aplicação de quelatos de zinco em um solo deficiente cultivado com milho em casa de vegetação /." Jaboticabal : [s.n.], 2008. http://hdl.handle.net/11449/96935.
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Orientador: Edson Luiz Mendes Coutinho<br>Banca: Salatier Buzetti<br>Banca: Mara Cristina Pessôa da Cruz<br>Resumo: O zinco é um micronutriente considerado limitante à produção do milho no Brasil, sendo a sua deficiência muito comum em todas as regiões do país. Com o objetivo de avaliar os efeitos de doses e fontes de Zn nas concentrações do micronutriente no solo, na planta e na produção de matéria seca da parte aérea do milho, foi conduzido um experimento em casa de vegetação, empregando-se amostra de um Latossolo Vermelho textura média. O delineamento experimental foi inteiramente casualizado, com três repetições, segundo um arranjo fatorial 6 x 3 (seis doses de Zn e três fontes). Foram empregadas as seguintes doses de Zn: 0; 0,5; 1; 2; 4 e 6 mg kg-1, utilizando-se as fontes: Zn-EDTA, Zn-lignosulfonato (Zn-LS) e sulfato de zinco. Verificou-se que a aplicação de Zn, independentemente da fonte considerada, aumentou significativamente a produção de matéria seca da parte aérea de milho e as concentrações do micronutriente no solo e na planta. A fonte Zn-LS proporcionou concentrações de Zn no solo e na planta significativamente superiores, particularmente em relação à fonte inorgânica. As fontes de Zn apresentaram um comportamento semelhante em termos de produção de matéria seca. Os níveis críticos de Zn no solo e na parte aérea da planta foram respectivamente, 0,9 e 16 mg kg-1.<br>Abstract: The zinc is a micronutrient that limits the production of the maize in Brazil, being its very common deficiency in all the regions of the country. With the objective of evaluating the effect of the zinc rates in micronutrients concentration in soil, in plants and maize shoot dry matter production, an experiment in pots containing Haplustox (Latossolo Vermelho). It was used a complete randomized design, with three replications of treatments, in a factorial arrangement 6 x 3 (six rates of zinc and three sources). It was used following rates of zinc: 0; 0.5; 1; 2; 4 e 6 mg kg-1, and sources: Zn-EDTA, Zn-lignosulfonate (Zn-LS) and zinc sulfate. It was observed zinc application, own the sources, increased corn shoot dry matter and the micronutrient concentration in soil and plant. The source Zn-LS provided more Zn concentration in soil and plant than inorganic source. The zinc sources showed the same performance in dry matter production. The Zn level critic in soil and plant were respectively 0.9 mg kg-1 and 16 mg kg-1.<br>Mestre
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Karlsson, Lovisa. "Waste Water Treatment - A Case Study : Removal of Ni, Cu and Zn through precipitation and adsorption." Thesis, Örebro universitet, Institutionen för naturvetenskap och teknik, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:oru:diva-26130.
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Waste water containing high concentrations of dissolved metals were delivered to the environmental company SAKAB. After standard treatment procedure, involving regulation of pH and addition of flocculation agents, the water still contained nickel concentrations of 26 mg/l. Since SAKAB’s regulatory concentration limit value for nickel in outgoing water is 0.5 mg/l, further treatment was necessary. According to the supplier of the water, a complexing agent similar to EDTA had been added to the water. The aim of this study was to decrease concentrations of nickel, zinc and copper. One part of this study was the precipitation experiments as hydroxide, sulphide and adsorption to hydrous ferric oxide. The other part was adsorption to natural, organic materials such as peat, wood chips and one commercial bark compost. Adsorption to hydrous ferric oxide was the most efficient of the precipitation experiments. When 2000 mg FeCl3 was added to 100 ml waste water and pH of the solution was adjusted to pH 8, a decrease up to 74 % of total nickel concentrations was achieved. Most efficient of the adsorption experiments were the one with commercial bark compost which decreased nickel concentrations in solution up to 94 % after 20 hours of agitation.
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Shih, Hsiu-Ling, and 石秀玲. "Synthesis of NB-TTDA, EDTA-bis(amide) and 1,4-DO2A, the stabilities of their complexes with Gd(III), Mn(II), Ca(II), Zn(II) and Cu(II) and relaxometric studies of Gd(III) and Mn(II) chelates." Thesis, 2001. http://ndltd.ncl.edu.tw/handle/79154034511216311364.
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碩士<br>高雄醫學大學<br>藥學研究所<br>89<br>The linear ligand of NB-TTDA (p-nitrobenzyl-N,N'-diethylene-N,N'- trimethylenetriamine-N,N, N', N'', N''-pentaacetic acid), four bis(amide) derivatives of EDTA(ethylenediamine-N,N'-tetraacetic acid), EDTA-BDEA(ethylenediamine-N,N'- diacetic-N,N'-bis(diethylamide)), EDTA-BCPA(ethylenediamine-N,N'-diacetic-N,N'-bis(cyclopentylamide)), EDTA- BMOBA (ethylene-diamine-N,N'-diacetic-N,N'-bis(2-methoxybenzylamide)), EDTA-BBA(ethylenediamine-N,N'-diacetic- N,N'-bis- (benzylamide)) and macrocyclic ligand of 1,4-DO2A(1,4,7,10-tetraaza- cyclododecane-1,4-diacetatic acid) were synthesized. Their protonation constants were determined by potentiometic titration and by NMR pH titration at 25.0°C. The stability constants of the complexes of calcium(II), copper(II), zinc(II), manganese(II) and gadolinium(III) were also determined by potentiometic titration. Spin-lattice relaxivity r1 (20MHz, 37.0±0.1°C) for Gd(III) and Mn(II) complexes were determined at different pH values. Finally, the influence of r1 values for the Gd(III) and Mn(II) complexes at different temperature range was also investigated. A monoexponential decrease of the observed relaxivity upon increasing temperature was found. This is characteristic of the fast chemical exchange behavior which occurs when the residence lifetime of the coordinated water molecule is much shorter than the relaxation time of the bond water proton. The EPR transverse electronic relaxation rate and 17O NMR transverse relaxation time were thoroughly investigated and the results obtained were compared with those reported previously for [Gd(DTPA)(H2O)]2-. The short exchange lifetime value was observed for [Gd(NB-TTDA)]2-.
Conference papers on the topic "Zn-EDTA"
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Ghani, M., S. V. Slycken, E. Meers, F. M. G. Tack, F. Naz, and S. Ali. "Enhanced Phytoextraction of Cadmium and Zinc Using Rapeseed." In ASME 2013 15th International Conference on Environmental Remediation and Radioactive Waste Management. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/icem2013-96362.
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In a green house pot experiment, the effects of three amendments, sulphur (S), ammonium sulphate ((NH4)2SO4) and ethylenediaminetetracetic acid (EDTA) were tested for phytoextraction of Cd and Zn by rapeseed (Brassica napus L.). Elemental sulphur was applied as 20.00, 60.00, and 120.00 mg.kg−1 soil. EDTA was tested at a dose of 585.00 mg.kg−1 soil, and (NH4)2SO4) at a rate of 0.23 mg.kg−1 soil. All treatments received a base fertilization (Hogland) before sowing. Plants were harvested after 51 days of growth and shoot dry matter and soil samples were analysed for metal contents. All amendments caused a significant increase in Cd and Zn contents in plant shoots of all treatments than control treatment. Further, EDTA was most effective for extraction metals concentrations in shoot biomass but the plants showed significant signs of toxicity and yield were severely depressed. The addition of sulfur favorably influenced plant biomass production. The fertilized ammonium sulfate treatment resulted in the highest phytoextraction of Cd and Zn and the amounts of these metals accumulated in plant shoot exceeded by a factor of 4 and 3 respectively. Finally, Brassica napus could be used for soil remediation keeping its other uses which will make the contaminated site income generating source for the farmers.
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Dan Guo, Xiuying Jia, Xiaoyue Wang, and Weiqin Zhu. "The enhancement effects of EDTA, citric acid and NTA on phytoremediation of vermicompost enriched with high Cu and Zn contents." In 2011 International Conference on Remote Sensing, Environment and Transportation Engineering (RSETE). IEEE, 2011. http://dx.doi.org/10.1109/rsete.2011.5964869.
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Liu, Guannan, Xiaosai Li, Jibo Wang, and Ming Chen. "Medium-scale ex suit electrokinetic remediation of Cd and Zn polluted soil enhanced by EDTA, tartaric acid, citric acid and acetic acid." In 2017 6th International Conference on Energy and Environmental Protection (ICEEP 2017). Atlantis Press, 2017. http://dx.doi.org/10.2991/iceep-17.2017.237.
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Siripornadulsil, Surasak, and Wilailak Siripornadulsil. "Characterization of Cadmium-Resistant Bacteria and Their Application for Cadmium Bioremediation." In ASME 2009 12th International Conference on Environmental Remediation and Radioactive Waste Management. ASMEDC, 2009. http://dx.doi.org/10.1115/icem2009-16072.
Full textAbstract:
On a global basis, trace-metal pollution is one of the most pervasive environmental problems. It is particularly difficult to prevent or clean up because the metals are toxic in their elemental form and cannot be decomposed. Bioremediation has been shown to be a powerful system for heavy metal pollution clean up and prevention. In this work, we characterized the cadmium (Cd)-resistant bacteria isolated from rice field soil downstream from zinc (Zn) mineralized area which the owners were contaminated at high level of cadmium content in their blood (&gt;10 μgCd/g creatinine). We found that all 24 isolated bacteria tolerated toxic Cd concentrations (2,500 μM). In order to determine whether the Cd toxicity affected the growth of isolated bacteria, we grew the isolated bacterial cells in the absence and presence of toxic concentrations of CdCl2 (500 μM). In the absence of Cd, all isolated bacterial cells grew slightly better than in the presence of toxic concentrations of Cd. In addition, the Cd binding capacity of all isolated bacteria were very high, ranging from 6.38 to 9.38 log[Cd(atom)]/cell when grown in the presence of 500 μM CdCl2. Furthermore, the stability of Cd-bacteria complex of all isolated bacteria was affected by 1mM EDTA. When grown in the presence of 500 μM CdCl2, Cd-resistant isolates S2500-6, -8, -9, -15, -17, -18, -19, and -22 increasingly produced proteins containing cysteine (SH-group) (from 1.3 to 2.2 times) as well as 11 isolates of Cd-resistant bacteria, including S2500-1, -2, -3, -5, -6, -8, -9, -11, -16, -20, and -21, increasingly produced inorganic sulfide (1.5 to 4.7 times). Furthermore, the Sulfur K-edge X-ray absorption near-edge structure (XANES) spectroscopy studies indicated that Cd-resistant isolated S2500-3 precipitated amounts of cadmium sulfide (CdS), when grown in the presence of 500 μM CdCl2. The results suggested that these Cd-resistant bacteria have potential ability to precipitate a toxic soluble CdCl2 as nontoxic insoluble CdS. Interestingly, Cd-resistant bacteria isolated S2500-3, -8, -9,and -20 increased cadmium tolerance of Thai jasmine rice (Kao Hom Mali 105) when grown in the presence of 200 μM CdCl2. These 4 isolates also decreased cadmium concentration accumulation in Kao Hom Mali 105 plant at 61, 9, 6, and 17%, respectively when grown in the presence of 200 μM CdCl2. They were identified by 16S rDNA sequence analysis and classified as Cupriavidus taiwanensis (isolate S2500-3) and Pseudomonas aeruginosa (isolates S2500-8, -9, and -20).