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Articles de revues sur le sujet « Column injection »

Auteur : Grafiati

Publié le 9 mars 2023

Mis à jour le 31 juillet 2025

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1

Wylie, Philip, and Katsura Uchiyama. "Improved Gas Chromatographic Analysisof Organophosphorus Pesticides with Pulsed Splitless Injectiony." Journal of AOAC INTERNATIONAL 79, no. 2 (1996): 571–78. http://dx.doi.org/10.1093/jaoac/79.2.571.

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Abstract Gas chromatographic (GC) analysis of 6 organo-phosphorus pesticides (methamidophos, acephate, omethoate, diazinon, dimethoate, and chlorpyrifos) was performed with cool on-column, splitless, and pulsed splitless injections and with nitrogen–phos phorus or mass-selective detection. The pulsed splitless technique uses a high column flow rate during injection to sweep the sample out of the inlet rapidly, reducing analyte loss due to adsorption or thermal decomposition. After injection, the column flow rate is automatically reduced to normal values for chromatographic analysis. Pesticide

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2

Hopper, Marvin L. "Analysis of Organochlorine Pesticide Residues Using Simultaneous Injection of Two Capillary Columns with Electron Capture and Electrolytic Conductivity Detectors." Journal of AOAC INTERNATIONAL 74, no. 6 (1991): 974–81. http://dx.doi.org/10.1093/jaoac/74.6.974.

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Abstract A system has been developed that will allow low level screening of 31 organochlorine pesticide residues using simultaneous injection on 2 dissimilar capillary columns. An electron capture detector was attached to a DB-1701 column, and an electrolytic conductivity detector in the halogen mode was attached to a DB-5 column. Chlorinated pesticide amounts ranging from 0.05 ng for γ-BHC to 1.5 ng for decamethrin can easily be quantitated and confirmed. The system can be used in either the column programmed mode or the isothermal column mode. Good reproducibility was obtained for injections

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3

Watanabe, Chuichi, and Keiji Hashimoto. "Direct injection of large sample volumes into capillary columns with packed column injector." Journal of High Resolution Chromatography 13, no. 9 (1990): 610–13. http://dx.doi.org/10.1002/jhrc.1240130905.

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4

Gong, Ya-Nan, Qi-Yu Ma, Ying Wang, et al. "Preparation of Chiral Porous Organic Cage Clicked Chiral Stationary Phase for HPLC Enantioseparation." Molecules 28, no. 7 (2023): 3235. http://dx.doi.org/10.3390/molecules28073235.

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Porous organic cages (POCs) are a new subclass of porous materials, which are constructed from discrete cage molecules with permanent cavities via weak intermolecular forces. In this study, a novel chiral stationary phase (CSP) has been prepared by chemically binding a [4 + 6]-type chiral POC (C120H96N12O4) with thiol-functionalized silica gel using a thiol-ene click reaction and applied to HPLC separations. The column packed with this CSP presented good separation capability for chiral compounds and positional isomers. Thirteen racemates have been enantioseparated on this column, including al

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5

Ma, R., and Yan Xiao. "Seismic Retrofit and Repair of Circular Bridge Columns with Advanced Composite Materials." Earthquake Spectra 15, no. 4 (1999): 747–64. http://dx.doi.org/10.1193/1.1586070.

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Experimental studies on seismic retrofit and repair of typical circular bridge columns with poor lap splice details utilizing prefabricated glass fiber reinforced polymer (FRP) composite jackets and epoxy are presented in this paper. A total of seven tests on three 1/2-scale model columns were conducted. One column was tested under “as-built” condition and the other two columns were retrofitted with prefabricated composite individual and continuous jackets respectively. The jackets were applied in the potential plastic hinge region of the column to increase its lateral confinement. Brittle fai

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Irfan, Hafeez* Muhammad Azam Zahid Mahmood Athar Amin Muhammad Aamir Adnan Akram. "RAPID ESTIMATION OF PHOSPHOLIPED BY IMMOBILIZED PHOSPHOLIPASE D FROM PISTACHIA KHINJUK IN FIA SYSTEM." INTERNATIONAL JOURNAL OF ENGINEERING SCIENCES & RESEARCH TECHNOLOGY 6, no. 3 (2017): 356–62. https://doi.org/10.5281/zenodo.400976.

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Blue green gains of Pistachia khinjuk was collected from area of Harnai Balochistan and crude Phospholipase D was isolated by simple protean precipitation. This enzyme was covalently bounded on the surface of controlled porosity glass beads and packed in small glass columns. Immobilized PLD was used for quantitative determination of Phosphatidylcholine (Lecithin) and Phosphorylcholine in flow-injection analysis system. Immobilized columns of Phospholipase C from rice and Choline oxidase from chicken intestine were also prepared in same manner. The phosphatidylcholine was estimated by incorpora

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7

Kehr, Ján, and Mikuláš Chavko. "Protection, efficiency, and some practical aspects of use of CGC columns in high performance liquid chromatography." Collection of Czechoslovak Chemical Communications 51, no. 10 (1986): 2091–97. http://dx.doi.org/10.1135/cccc19862091.

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Some practical adaptations of compact glass cartridge (CGC) columns and design of related components of the high-performance liquid chromatographic system are suggested; included are the design of a Teflon guard column and its filling procedure, an intra-column sample injector for on-column sample delivery or for injection into the precolumn, replacement of a contaminated packing or replenishment of packing at the top of the CGC column, a procedure for shortening the column to a desired length, and the possibility of thermostatting the column by means of a water jacket. These adaptations make

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8

Parfitt, Charles H. "Wide-Bore Capillary Gas Chromatographic Determination of Organophosphorus Pesticide Residues in Foods: Interlaboratory Trial." Journal of AOAC INTERNATIONAL 77, no. 1 (1994): 92–101. http://dx.doi.org/10.1093/jaoac/77.1.92.

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Abstract Wide-Bore capillary columns are often used as alternatives to traditionally packed columns for gas chromatographic (GC) determination of pesticide residues in foods. Fused silica columns with cross-linked, bonded stationary phases are reproducible, rugged, and easy to use and are substantially more inert than their packed column equivalents. An interlaboratory trial was conducted in 5 U.S. Food and Drug Administration laboratories to determine the practicability of using isothermal wide-bore capillary GC as an alternative to the packed column GC systems used in AOAC Official Methods f

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9

Dadonova, Anna, Ivan Yakoviv, and Valerii Kozlovskiy. "Method of protection of database management systems against sql-identifier injection attacks." Science-based technologies 52, no. 4 (2021): 305–12. http://dx.doi.org/10.18372/2310-5461.52.16385.

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The article reviews SQL injection and SQL identifier injection attacks in database management systems, identifies their nature, the threats they pose, and the types of these attacks. A new method of protecting database management systems from SQL identifier injection attacks is also covered. Proposed solution are functions that can be added to the prepared API statements: setColumnName: uses the column name and its index as arguments and setTableName: uses the table name and its index as arguments. This method allows you to prepare operators to fill placeholders with table and column names, pr

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10

Santos, Natalia G. P., Deyber A. V. Medina, and Fernando M. Lanças. "Development of Wall-Coated Open Tubular Columns and Their Application to Nano Liquid Chromatography Coupled to Tandem Mass Spectrometry." Molecules 28, no. 13 (2023): 5103. http://dx.doi.org/10.3390/molecules28135103.

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This work presents a study on the application of wall open tubular column (WCOT) in liquid chromatography coupled with tandem mass spectrometry. Each process step reports the column preparation method in detail, subdivided into column pretreatment, silanization, stationary phase coating, and immobilization. Then, an evaluation of the parameters that can affect the efficiency of these columns was made. Atrazine, clomazone, and metolachlor were used as probes during this step. Factors such as stationary phase composition, length, internal diameter, stationary phase mass employed, and injection v

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11

Hagman, Gunnar, and Johan Roeraade. "Automated at-column injection into narrow bore capillary GC columns." Journal of High Resolution Chromatography 14, no. 10 (1991): 686–88. http://dx.doi.org/10.1002/jhrc.1240141010.

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12

Penton, Z. "Gas-chromatographic determination of ethanol in blood with 0.53-mm fused-silica open tubular columns." Clinical Chemistry 33, no. 11 (1987): 2094–95. http://dx.doi.org/10.1093/clinchem/33.11.2094.

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Abstract Several 0.53 mm (i.d.) fused-silica open tubular columns were evaluated for the gas-chromatographic determination of ethanol and other volatiles in blood by both headspace and liquid injection. These columns offer the advantages of fused-silica technology without requiring expensive modification of the instrument for capillary. Methyl silicone columns of various lengths and film thicknesses were examined and also a polyethylene glycol column. The merits of each column are discussed and relative retention times are given.

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13

Alkhateeb, Fadi L., Taylor C. Hayward, and Kevin B. Thurbide. "A novel ultrashort capillary gas chromatography method using on-column injection and detection." Canadian Journal of Chemistry 94, no. 4 (2016): 259–64. http://dx.doi.org/10.1139/cjc-2015-0068.

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A novel method for ultrashort capillary column gas chromatography (GC) analysis is introduced, which employs on-column injection and detection and rapid temperature programming. Using 10–20 cm long capillary columns, results showed that the method provides efficient and very rapid separations for relatively simple mixtures. Moreover, the on-column aspect of the method used here is demonstrated to avoid the extra column analyte degradation that can occur in traditional approaches to such separations. As a result, the developed method allows for the first time the GC analysis of some very large

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14

Evans, R. Douglas, Andrei Izmer, Karima Benkhedda, Andrew Toms, Angelo Fernando, and Wei Wang. "Continuous online determination of 226Ra in liquid effluents using automated column chromatography-ICP-MS." Canadian Journal of Chemistry 93, no. 11 (2015): 1226–31. http://dx.doi.org/10.1139/cjc-2015-0247.

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A measurement system capable of continuous on-line matrix removal, pre-concentration and analysis of 226Ra using pre-packed columns coupled to a flow injection system and an ICP-MS was developed. Full instrumental control of both the ICP-MS and the flow injection system provided automatic integration of the transient signals. The flow injection system was programmed to control column conditioning, sample loading, column rinsing, analyte elution and column cleaning operations employing appropriate solutions. The application of this system to the 226Ra analysis of an industrial liquid effluent w

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15

Suzuki, Toshesari, Kumiko Yaguchi, Kazuo Ohnishi, and Tatsunori Yamagishi. "Gas Chromatographic Detection of Tris(2-chloroethyl) and Tris(2-butoxyethyl)phosphate in Groundwater by Large-Sample-Volume Injection." Journal of AOAC INTERNATIONAL 77, no. 6 (1994): 1647–50. http://dx.doi.org/10.1093/jaoac/77.6.1647.

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Abstract A capillary gas chromatograph equipped with a flame photometric detector (GC–FPD) for splitless injection of large sample volume was developed. The GC–FPD effectively diverted dichloromethane from the analytical column through a solvent diversion column and quantitatively retained tri(2-chloroethyl) phosphate (TCEP) and tris(2-butoxyethyl)- phosphate (TBXP) on a cold-trap column in front of the analytical column. The optimum conditions for 100 uL injections of TCEP and TBXP in dichloromethane at concentrations from 1 to 100 ng/mL were investigated. With the GC–FPD, relative standard d

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16

Jorge, Luiz Mario de Matos, Patrícia Aparecida Polli, Douglas Junior Nicolin, Regina Maria Matos Jorge, Paulo Roberto Paraíso, and Rubens Maciel Filho. "SIMULATION AND ANALYSIS OF AN INDUSTRIAL COLUMN SYSTEM OF BIOETHANOL DISTILLATION HEATED BY VAPOR DIRECT INJECTION." Engevista 17, no. 2 (2015): 254. http://dx.doi.org/10.22409/engevista.v17i2.657.

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Most commercial process simulators have its origin at the petrochemical industry and their use in other sectors depends on testing. In this context a model of an industrial column system of bioethanol distillation heated by direct injection of vapor was developed and implemented using the simulator Aspen HYSYS, which was compared with experimental data obtained in the industrial plant. The system basically consists of four columns heated by direct vapor injection and the model of the system was developed using this approach together with the simulation blocks for columns heated by reboilers av

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17

Li, Yeou-Fong, and Yi-Ying Sung. "Seismic repair and rehabilitation of a shear-failure damaged circular bridge column using carbon fiber reinforced plastic jacketing." Canadian Journal of Civil Engineering 30, no. 5 (2003): 819–29. http://dx.doi.org/10.1139/l03-042.

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In this paper, the analytical and experimental results of tests on a benchmark and a damaged circular bridge column are presented. The benchmark column is a 40% scale reinforced concrete circular bridge column damaged as a result of shear failure during a cyclic-loading test; the benchmark column was then repaired by epoxy and non-shrinkage mortar and rehabilitated by carbon fiber reinforced plastic (CFRP) after the cyclic-loading test. The benchmark bridge column is tested under a cyclic-loading test with constant axial load. The result shows that the column suffered shear failure at low disp

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18

Gharries, Helen. "Clinical anatomy of the spine for pain interventionist." Journal of Anesthesia and Critical Care: Open access 10, no. 4 (2018): 140–45. http://dx.doi.org/10.15406/jaccoa.2018.10.00378.

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Pain interventionist emphasizes particular attention to the spinal anatomy. Spine pain generators differ from intervertebral disc to facet joint or ligaments. Injection at these critical structures requires a complete visualization of anatomical location. Spinal cord injury or intravascular injections are the serious complications of spine pain intervention. Understanding the neurovascular anatomy of the spinal column prevents misfortune injection and its unwanted complications. The purpose of this study is to review spine anatomy and responsible pain generators and to verify the importance of

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19

Fujinaga, Takashi, and Yuping Sun. "Structural Performance of Damaged Open-Web Type SRC Beam-Columns after Retrofitting." Sustainability 12, no. 4 (2020): 1381. http://dx.doi.org/10.3390/su12041381.

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The structural performance of damaged open-web type of steel encased reinforced concrete (SRC) beam-columns after retrofitting was experimentally investigated. The experimental parameters were the open-web type of the encased steel and the maximum tip displacement of the columns during the initial loading. First, each column was cyclically loaded to the targeted displacement. Subsequently, the test columns were retrofitted and reloaded. The damaged portions of each column were retrofitted with the polymer cement mortar, and the epoxy resin was injected into the cracks. The experimental results

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20

Porsch, B., J. Voslář, J. Rosol, and V. Kubánek. "Preparative high-performance liquid chromatographic columns with an intra-column injection system." Journal of Chromatography A 520 (November 1990): 295–305. http://dx.doi.org/10.1016/0021-9673(90)85113-a.

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21

Ariny Demong, Andrew Ragai Rigit, and Khairuddin Sanaullah. "Effect of Swirl Gas Injection on Bubble Characteristics in a Bubble Column." Journal of Advanced Research in Fluid Mechanics and Thermal Sciences 102, no. 2 (2023): 155–65. http://dx.doi.org/10.37934/arfmts.102.2.155165.

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Swirling gas injection is a well-known technique to improve mass transfer in bubble columns. It can be used to create small bubbles with a high surface area-to-volume ratio, which is beneficial for mass transfer. Swirl gas injection can also be used to create a more uniform bubble size distribution and improve the mixing of gas and liquid in the column. This study aims to determine the impact of swirl gas injection on bubble properties, including bubble shape, size, and velocity. A bubble detection approach has been developed for quick and precise determination of bubble size distributions in

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22

Korytár, Peter, Eva Matisová, Henrieta Lefflerová, and Jaroslav Slobodník. "Large Volume Injection in Fast Gas Chromatography with On-Column Injector." Journal of High Resolution Chromatography 23, no. 2 (2000): 149–55. http://dx.doi.org/10.1002/(sici)1521-4168(20000201)23:2<149::aid-jhrc149>3.0.co;2-6.

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23

Cinar, Muhammet. "Investigation of Mechanical and Physical Features of Cementitious Jet Grout Applications for Various Soil Types." Buildings 13, no. 11 (2023): 2833. http://dx.doi.org/10.3390/buildings13112833.

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The cementitious jet grout method (CJG) is one of the most preferred methods for the ground reinforcement of building foundations. As a result of the soil improvement made with the CJG, it was observed that there was a decrease in settlement, permeability, and liquefaction potential and an increase in the bearing capacity. In this study, columns with different grouting pressures (400, 450, and 500 bar) and water/cement ratios of 0.75, 1.00, and 1.25 were produced on several soil types (sand, clay, and alluvial soil) that have high liquefaction, settlement potential, and low bearing capacity. C

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Yang, Defeng, Guobin Xu, and Yu Duan. "Effect of Particle Size on Mechanical Property of Bio-Treated Sand Foundation." Applied Sciences 10, no. 22 (2020): 8294. http://dx.doi.org/10.3390/app10228294.

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In the field of geotechnical engineering, microbially induced calcium precipitation technology is feasible and sustainable alternative to improve the engineering characteristics of sand foundation under different geological conditions for a long time. However, it is unclear how the effects of different sand particle sizes on the engineering characteristics of bio-treated sand column. The method of intermittent injection in batches was used to develop a series of bio-treated sand columns. The results showed that the mechanical properties of the bio-treated column improved by increasing the part

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25

Schmid, Rainer, and Christian Wolf. "Construction of a new “closed on-column” injector for hot “on-column” injection in capillary gas chromatography." Fresenius' Zeitschrift für analytische Chemie 324, no. 3-4 (1986): 315–16. http://dx.doi.org/10.1007/bf00487956.

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Roeraade, J. "At-column injection: An improved method for accurate sample transfer to capillary columns." Journal of High Resolution Chromatography 8, no. 11 (1985): 801–2. http://dx.doi.org/10.1002/jhrc.1240081116.

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27

Ghazali, Nurul Aimi, T. A. T. Mohd, N. Alias, et al. "Gas Lift Optimization of an Oil Field in Malaysia." Advanced Materials Research 974 (June 2014): 367–72. http://dx.doi.org/10.4028/www.scientific.net/amr.974.367.

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Gas lift is an artificial lift method which is commonly used in offshore operation with sufficient gas sources as it consumes minimum space on the platform. Gas lift operates by injecting a high pressure gas down through the tubing casing annulus of a well and the injected gas enters the tubing through a gas lift valve installed on the tubing. Gas lift increases production by two means, density reduction of oil column inside the tubing so that the flowing bottom-hole pressure which is affected by the hydrostatic pressure of the fluid column is reduced and by providing external energy to the oi

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28

Schweitzer, Jeffrey S., Bin Song, Pierre R. Leblanc, Melissa Feitosa, Bob S. Carter, and Kwang-Soo Kim. "Columnar Injection for Intracerebral Cell Therapy." Operative Neurosurgery 18, no. 3 (2019): 321–28. http://dx.doi.org/10.1093/ons/opz143.

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Abstract BACKGROUND Surgical implantation of cellular grafts into the brain is of increasing importance, as stem cell-based therapies for Parkinson and other diseases continue to develop. The effect of grafting technique on development and survival of the graft has received less attention. Rate and method of graft delivery may impact the cell viability and success of these therapies. Understanding the final location of the graft with respect to the intended target location is also critical. OBJECTIVE To describe a “columnar injection” technique designed to reduce damage to host tissue and resu

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29

Akchurin, Ruslan Z., Filyus F. Davletshin, Denis F. Islamov, Rim A. Valiullin, and Ayrat Sh Ramazanov. "Features of the thermal field during fluid injection into the well during induction heating of the casing." Tyumen State University Herald. Physical and Mathematical Modeling. Oil, Gas, Energy 9, no. 4 (2023): 44–58. http://dx.doi.org/10.21684/2411-7978-2023-9-4-44-58.

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Pumping water into productive formations is one of the most common methods of oil field development. The effectiveness of reservoir flooding technology largely depends on the compliance of the design and actual volumes of water injection. Due to the violation of the tightness of the cement ring, fluid flows occur in the column space, which cause non-project withdrawal of the injected liquid into non-perforated layers. Identification and prompt elimination of backwater flows during injection of liquid into injection wells is one of the important tasks of efficient and environmentally friendly d

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Kuznetsov, V. G., and O. A. Makarov. "PRESSURE CONTROL SYSTEM AT CEMENTATION OF WELLS." Oil and Gas Studies, no. 1 (March 1, 2017): 62–67. http://dx.doi.org/10.31660/0445-0108-2017-1-62-67.

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At cementing of casing of oil and gas wells during the process of injecting of cement slurry in the casing column the slurry can move with a higher speed than it’s linear injection speed. A break of continuity of fluid flow occurs, what can lead to poor quality isolation of producing formations and shorten the effective life of the well. We need to find some technical solution to stabilize the linear velocity of the cement slurry in the column. This task can be resolved with an automated control system.

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Arrendale, R. F., J. T. Stewart, and R. M. Martin. "Effects of the pre-column in automated on-column injection capillary gas chromatography." Journal of Chromatography A 518 (January 1990): 307–18. http://dx.doi.org/10.1016/s0021-9673(01)93192-9.

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Syamsuri, Syamsuri, Wulandari Mirzayanti Yustia, Lillahulhaq Zain, and Bagus Hidayat Achmad. "Implementation of packed column for biogas purification as fuel for motorcycle injection systems for performance improvement." Eastern-European Journal of Enterprise Technologies 4, no. 1 (112) (2021): 86–93. https://doi.org/10.15587/1729-4061.2021.239027.

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The use of gasoline for primary energy consumption can reduce crude oil, contained in the earth. The development of alternative fuels such as biogas and biofuel is very critical to overcoming this problem. Biogas requires purification to remove some contaminant particles that interfere with the combustion process. The packed column is generally applied to absorb and separate gas and liquid mixture. It is more efficient due to the liquid flows down the column of steam naturally without the supply of energy from outside the system. This study focuses on determining the effect of the packed colum

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Nguyen, Thanh-Tuan, Do-Gun Kim, and Seok-Oh Ko. "Degradation of Oxytetracycline in Saturated Porous Media by In Situ Chemical Oxidation Using Oxygen-Doped Graphitic Carbon Nitride and Peroxymonosulfate: Laboratory-Scale Column Experiments." Water 16, no. 16 (2024): 2355. http://dx.doi.org/10.3390/w16162355.

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Oxytetracycline (OTC) is frequently detected in groundwater and soil, posing substantial risks to the subsurface environment via persistence, phytotoxicity, changing bacterial communities, and antibiotic resistance. In situ chemical oxidation (ISCO) is one of the best alternatives for removing OTC from groundwater. However, its feasibility has rarely been investigated using columns for which optimal conditions can be obtained for practical applications. Thus, a system consisting of oxygen-doped graphitic carbon nitride (OgCN) and peroxymonosulfate (PMS) (OgCN/PMS) was tested for OTC removal us

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Engelhardt, H., R. Klinkner, and G. Schöndorf. "Post-column reaction detection and flow injection analysis." Journal of Chromatography A 535 (December 1990): 41–53. http://dx.doi.org/10.1016/s0021-9673(01)88934-2.

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Janák, Karel, Anders Colmsjö, and Conny Östman. "Increased on-column injection temperature for gas chromatography." Journal of High Resolution Chromatography 18, no. 2 (1995): 117–20. http://dx.doi.org/10.1002/jhrc.1240180211.

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36

Fehringer, Norbert V., and Stephen M. Walters. "Evaluation of Capillary Gas Chromatography for Pesticide and Industrial Chemical Residue Analysis. II. Comparison of Quantitative Results Obtained on Capillary and Packed Columns." Journal of AOAC INTERNATIONAL 69, no. 1 (1986): 90–93. http://dx.doi.org/10.1093/jaoac/69.1.90.

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Abstract Results of pesticide and industrial chemical residue determinations, using both capillary and packed column gas chromatography (GC), in 3 Food and Drug Administration (FDA) laboratories have been compiled and compared. Samples consisted of food products collected for routine residue screening by the respective laboratories. Extracts were prepared by conventional multiresidue methodology. Capillary column systems and operating conditions were selected at the discretion of each laboratory and were therefore variable, although split/splitless injectors in the split mode were used with pr

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Berg, Jonathan D., and Brendan M. Buckley. "Rapid Measurement of Anticonvulsant Drug Concentrations in the Out-Patient Clinic, Using HPLC with Direct Injection of Plasma." Annals of Clinical Biochemistry: International Journal of Laboratory Medicine 24, no. 5 (1987): 488–93. http://dx.doi.org/10.1177/000456328702400511.

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A manual column-switching technique is described for the measurement of phenytoin, phenobarbitone, carbamazepine, and carbamazepine 10,11-epoxide. The analytical system is designed to be portable for use at the out-patient clinic and comprises an isocratic pump, UV detector and injection valve, together with a preparation column. Diluted plasma or serum is injected, without pre-extraction, onto a preparation column which replaces the sample loop on the injection valve. After washing unwanted material to waste, the preparation column is switched in-line with the analytical column, where separat

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38

Burakham, R., and K. Grudpan. "Flow Injection and Sequential Injection On-line Pre-column Derivatization for Liquid Chromatography." Journal of Chromatographic Science 47, no. 8 (2009): 631–35. http://dx.doi.org/10.1093/chromsci/47.8.631.

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39

Hinshaw, J. V., and W. Seferovic. "Programmed-temperture split-splitless injection of triglycerides: Comparison to cold on-column injection." Journal of High Resolution Chromatography 9, no. 2 (1986): 69–72. http://dx.doi.org/10.1002/jhrc.1240090203.

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Kodama, K., K. Yamanaka, T. Nakata, and M. Aoyama. "Liquid-chromatographic assay of urinary vanillylmandelic acid and homovanillic acid, with clean-up by on-column injection of acetonitrile or methanol." Clinical Chemistry 32, no. 10 (1986): 1944–47. http://dx.doi.org/10.1093/clinchem/32.10.1944.

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Abstract To separately measure vanillylmandelic acid (VMA) and homovanillic acid (HVA) in urine, the sample is diluted 10-fold with 50 mmol/L phosphoric acid, then exactly 5 microL is injected directly onto a 50 X 4.6 mm column of Nucleosil 3C18. Samples can be injected at 5-min intervals because all peaks after these compounds of interest are washed away. VMA is eluted from the column after 2.8 min with 50 mmol/L phosphate buffer, pH 2.2, and measured by electrochemical detection. All peaks eluting after VMA are washed away together, by injection of 50 microL of acetonitrile onto the column.

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Wang, Cong. "Integrated technology for layered sand control and layered water injection." Journal of Physics: Conference Series 2683, no. 1 (2024): 012044. http://dx.doi.org/10.1088/1742-6596/2683/1/012044.

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Abstract In order to solve the problem of water injection string failure caused by pipe creep and sand production in layered water injection wells, an integrated technology of layered sand control and layered water injection has been developed. A suspended large-radiuslayered mechanical sand control pipe column has been designed, providing sufficient design and usage space for the layered water injection pipe column. Developing a new type of anti-creep sealed packer can effectively improve the anti-creep performance of the water injection string and extend the validity period of the string. Th

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Petrov, Panayot, Simon Cowen, and Heidi Goenaga-Infante. "On-column internal standardisation as an alternative calibration strategy for speciation analysis: feasibility demonstration through analysis of inorganic As in rice." Analytical Methods 13, no. 33 (2021): 3641–48. http://dx.doi.org/10.1039/d1ay00699a.

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On-column species-specific internal calibration, based on the injection of internal standard, which is the same as the analyte species, compensates for on-column losses, signal drift and others, and provides accurate measurements with low uncertainty.

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Chen, Meilan, Jiasheng Yu, Mingli Ye, and Weiqiang Guo. "Analysis of Ammonium in Seawater by Ion Chromatography With Single-Pump Column Switching." Marine Technology Society Journal 51, no. 3 (2017): 43–47. http://dx.doi.org/10.4031/mtsj.51.3.5.

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AbstractAn ion chromatograph single-pump column-switching system was developed for the determination of ammonium in high salt matrices. The simple system included a pump, a suppressor, two valves, two columns, a single eluent, and a conductivity detector. Using this method, both online collection and matrix elimination were achieved. Ammonium was eluted from the acceptor loop to the analytical column circularly. Under the optimized separation conditions, the method showed good linearity (r = 0.9997) in the range of 0.05‐2.0 mg/L and satisfactory repeatability (RSD < 4%, n = 6). The limit of

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Maris, Christophe, Alain Laplanche, Jean Morvan, and Marianne Bloquel. "Development of a Packed Precolumn for Capillary Gas Chromatographic Analysis of Amines in Acidic Aqueous Solution." Water Science and Technology 40, no. 6 (1999): 141–48. http://dx.doi.org/10.2166/wst.1999.0283.

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This paper describes an optimization of the analysis of amines in aqueous solution. Direct injection of the acidic sample (HCl 0.12 N) is performed by the coupling of packed precolumn with a capillary column. The basic support efficiently traps residual vapors of hydrochloric acid and water at the injection time; the capillary chromatographic performance is maintained. The precolumn coupling with PoraPLOT Amines capillary column enables a separation and quantification of the lower volatile aliphatic amines (methylamine, dimethylamine, trimethylamine and ethylamine). The ammonia addition to the

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Groutsi, F., M. R. J. Mason, P. N. Anderson, et al. "Retrograde viral transduction of cortical pyramidal neurons from the spinal cord." Restorative Neurology and Neuroscience 26, no. 6 (2008): 509–20. https://doi.org/10.3233/rnn-2008-00451.

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Purpose: The primary motor pathway, the corticospinal tract, is a major target for spinal cord regeneration studies. One way of improving the regeneration of corticospinal axons is to introduce regeneration-associated genes into cortical motor neurons using viral vector delivery. Methods: We used an engineered Herpes Simplex virus (HSV1) with the EF1α promoter encoding either LacZ or GFP to transduce cortical neurons through retrograde transport following the injection of vector into adult rat striatum or spinal cord. After three-days to one-month post-injection, sections of brain and spinal c

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Wang, Lu, and Shuhua Liu. "Mechanism of Sand Cementation with an Efficient Method of Microbial-Induced Calcite Precipitation." Materials 14, no. 19 (2021): 5631. http://dx.doi.org/10.3390/ma14195631.

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This paper presents an efficient method of microbial-induced calcite precipitation (MICP) for cementation of sand particles. First, the influence of initial pH value of the culture medium on the growth of bacteria was discussed. Then, the compressive strength and calcium carbonate content of cemented sand columns with different sand particle sizes were measured to indicate the cementation effectiveness. The microstructure of cemented sand columns as well as the mineral composition and distribution of calcium carbonate were characterised by means of scanning electron microscopy-energy dispersiv

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Deng, Weimin, and Randolph M. Beaudry. "Overcoming Gas Sampling Problems: Analysis of Volatiles Using Capillary Column Needles." HortScience 31, no. 4 (1996): 643f—643. http://dx.doi.org/10.21273/hortsci.31.4.643f.

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Sampling factors that could affect gas chromatograph (GC) response for volatile analysis such as syringe pumping time, injection volume, needle length, temperature, and the type of volatile were investigated. Capillary GC column segments (steel and glass) were installed in gas-tight syringes and used as needles for volatile analysis. Standard stainless-steel needles were also used. Hexylacetate, ethyl-2-methylbutyrate, 6-methyl-5-hepten-2-one, and butanol standard were measured. The number of pumps required to maximize GC response for each needle–volatile combination was determined. Maximal GC

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Shihabi, Z. K., and R. D. Dyer. "Serum Injection of the HPLC Column for Carbamazepine Assay." Journal of Liquid Chromatography 10, no. 11 (1987): 2383–91. http://dx.doi.org/10.1080/01483918708068919.

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Shihabi, Z. K., R. D. Dyer, and J. Scaro. "Serum Injection on the HPLC Column for Pentobarbital Assay." Journal of Liquid Chromatography 10, no. 4 (1987): 663–72. http://dx.doi.org/10.1080/01483918708069017.

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SATOH, IKUO, and IKUKO SAKURAI. "Use of a Laccase-Column for Flow-Injection Calorimetry." Annals of the New York Academy of Sciences 864, no. 1 ENZYME ENGINE (1998): 493–96. http://dx.doi.org/10.1111/j.1749-6632.1998.tb10366.x.

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