The Experts below are selected from a list of 13074 Experts worldwide ranked by ideXlab platform
Jingtian Hu - One of the best experts on this subject based on the ideXlab platform.
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speciation analysis of Mercury in seafood by using high performance liquid chromatography on line coupled with cold vapor atomic fluorescence spectrometry via a post column microwave digestion
Analytica Chimica Acta, 2003Co-Authors: Lina Liang, Guibin Jiang, Jingtian HuAbstract:Abstract An automatic system, based on the on-line coupling of high-performance liquid chromatography (HPLC) separation, post column microwave digestion, and cold-vapor atomic fluorescence spectrometry (CVAFS) detection, was proposed for the speciation analysis of four Mercury Compounds. Post column microwave digestion, in the presence of potassium persulfate (in HCl), was applied in the system to improve the conversion efficiency of three organic Mercury Compounds into inorganic Mercury. Parameters influencing the on-line digestion efficiency and the separation effect were optimized. To avoid water vapor and methanol entering into the atomic fluorescence detector, ice–water mixture bath was used to cool the microwave-digested sample solution. Four Mercury species including inorganic Mercury chloride (MC), methylMercury chloride (MMC), ethylMercury chloride (EMC) and phenylMercury chloride (PMC) were baseline separated within 13 min by using RP C18 column with a mobile phase of 50% (v/v) methanol containing 10 mmol l−1 tetrabutyl ammonium bromide and 0.1 mol l−1 sodium chloride pumped at 1.2 ml min−1. Seafood samples, composed of three gastropod species and two bivalve species from Yantai port, China, have been analyzed by the proposed method. Dogfish muscle (DORM-2) was analyzed to verify the accuracy of the method and the result was in good agreement with the certified value.
H F Scholer - One of the best experts on this subject based on the ideXlab platform.
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interfacing high performance liquid chromatography and cold vapour atomic absorption spectrometry with on line uv irradiation for the determination of organic Mercury Compounds
Journal of Chromatography A, 1994Co-Authors: Ralf Falter, H F ScholerAbstract:A liquid chromatographic method with on-line UV irradiation was developed for the determination of organic Mercury Compounds by cold-vapour atomic absorption spectrometry (AAS). Methyl-, ethyl-, phenyl- and inorganic Mercury were separated on R.P C18 columns. An UV-irradiation lamp was used for the on-line destruction of the organoMercury Compounds. Sample and NABH4 solution were continuously fed to the reaction vessel where Mercury was reduced. The volatilized Mercury was swept into the absorption cell of a cold-vapour AAS system by nitrogen. The detection limit for methylMercury is 80 pg absolute (S/N = 3).
Lina Liang - One of the best experts on this subject based on the ideXlab platform.
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speciation analysis of Mercury in seafood by using high performance liquid chromatography on line coupled with cold vapor atomic fluorescence spectrometry via a post column microwave digestion
Analytica Chimica Acta, 2003Co-Authors: Lina Liang, Guibin Jiang, Jingtian HuAbstract:Abstract An automatic system, based on the on-line coupling of high-performance liquid chromatography (HPLC) separation, post column microwave digestion, and cold-vapor atomic fluorescence spectrometry (CVAFS) detection, was proposed for the speciation analysis of four Mercury Compounds. Post column microwave digestion, in the presence of potassium persulfate (in HCl), was applied in the system to improve the conversion efficiency of three organic Mercury Compounds into inorganic Mercury. Parameters influencing the on-line digestion efficiency and the separation effect were optimized. To avoid water vapor and methanol entering into the atomic fluorescence detector, ice–water mixture bath was used to cool the microwave-digested sample solution. Four Mercury species including inorganic Mercury chloride (MC), methylMercury chloride (MMC), ethylMercury chloride (EMC) and phenylMercury chloride (PMC) were baseline separated within 13 min by using RP C18 column with a mobile phase of 50% (v/v) methanol containing 10 mmol l−1 tetrabutyl ammonium bromide and 0.1 mol l−1 sodium chloride pumped at 1.2 ml min−1. Seafood samples, composed of three gastropod species and two bivalve species from Yantai port, China, have been analyzed by the proposed method. Dogfish muscle (DORM-2) was analyzed to verify the accuracy of the method and the result was in good agreement with the certified value.
Shiuhjen Jiang - One of the best experts on this subject based on the ideXlab platform.
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speciation analysis of Mercury in cereals by liquid chromatography chemical vapor generation inductively coupled plasma mass spectrometry
Journal of Agricultural and Food Chemistry, 2008Co-Authors: Lanfang Chang, Shiuhjen JiangAbstract:A simple and rapid procedure for the separation and determination of inorganic, methyl, and ethyl Mercury Compounds was described using liquid chromatography (LC) followed by vapor generation inductively coupled plasma-mass spectrometry (VG-ICP-MS). Well resolved chromatograms were obtained within 5 min by reversed-phase liquid chromatography with a C8 column as the stationary phase and a pH 4.7 solution containing 0.5% v/v 2-mercaptoethanol and 5% v/v methanol as the mobile phase. The separated Mercury Compounds were converted to Mercury vapors by an in situ nebulizer/vapor generation system for their introduction into ICP. The concentrations of NaBH4 and HNO3 required for vapor generation were also optimized. The method was applied for the speciation of Mercury in reference materials NIST SRM 1568a Rice Flour and NIST SRM 1567a Wheat Flour and also rice flour and wheat flour samples purchased locally. The accuracy of the procedure was verified by analyzing the certified reference material NRCC DOLT-3 Do...
Ralf Falter - One of the best experts on this subject based on the ideXlab platform.
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interfacing high performance liquid chromatography and cold vapour atomic absorption spectrometry with on line uv irradiation for the determination of organic Mercury Compounds
Journal of Chromatography A, 1994Co-Authors: Ralf Falter, H F ScholerAbstract:A liquid chromatographic method with on-line UV irradiation was developed for the determination of organic Mercury Compounds by cold-vapour atomic absorption spectrometry (AAS). Methyl-, ethyl-, phenyl- and inorganic Mercury were separated on R.P C18 columns. An UV-irradiation lamp was used for the on-line destruction of the organoMercury Compounds. Sample and NABH4 solution were continuously fed to the reaction vessel where Mercury was reduced. The volatilized Mercury was swept into the absorption cell of a cold-vapour AAS system by nitrogen. The detection limit for methylMercury is 80 pg absolute (S/N = 3).