Jianguo Chen

Publications (2)7.94 Total impact

• Article: Determination of trace mercury species by high performance liquid chromatography-inductively coupled plasma mass spectrometry after cloud point extraction.

  Haiting Chen, Jianguo Chen, Xianzhong Jin, Danyi Wei
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  ABSTRACT: A sensitive method for speciation analysis of inorganic mercury (Hg(2+)) and methyl mercury (MeHg(+)) has been developed by using high performance liquid chromatography (HPLC) combined with inductively coupled plasma mass spectrometry (ICP-MS) after cloud point extraction. The analytes were complexed with sodium diethyldithiocarbamate (DDTC) and preconcentrated by a non-ionic surfactant Triton X-114. Mercury species were effectively separated by HPLC in less than 6 min. The enhancement factors for 25 mL sample solution were 42 and 21, and the limits of detection were 4 and 10 ng L(-1) for Hg(2+) and MeHg(+), respectively. The developed method was successfully applied to the determination of trace amount of mercury species in environmental and biological samples.
  Journal of hazardous materials 09/2009; 172(2-3):1282-7. · 4.14 Impact Factor
• Article: Determination of ultra-trace amount methyl-, phenyl- and inorganic mercury in environmental and biological samples by liquid chromatography with inductively coupled plasma mass spectrometry after cloud point extraction preconcentration.

  Jianguo Chen, Hengwu Chen, Xianzhong Jin, Haiting Chen
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  ABSTRACT: The cloud point extraction (CPE) preconcentration of ultra-trace amount of mercury species prior to reverse-phase high performance liquid chromatography (HPLC) with inductively coupled plasma mass spectrometry (ICP-MS) detection was studied. Mercury species including methyl-, ethyl-, phenyl- and inorganic mercury were transformed into hydrophobic chelates by reaction with sodium diethyldithiocarbamate, and the hydrophobic chelates were extracted into a surfactant-rich phase of Triton X-114 upon heating in a water bath at 40 degrees C. Ethylmercury was found partially decomposed during the CPE process, and was not included in the developed method. Various experimental conditions affecting the CPE preconcentration, HPLC separation, and ICP-MS determination were optimized. Under the optimized conditions, detection limits of 13, 8 and 6 ng l(-1) (as Hg) were achieved for MeHg(+), PhHg(+) and Hg(2+), respectively. Seven determinations of a standard solution containing the three mercury species each at 0.5 ng ml(-1) level produced relative standard deviations of 5.3, 2.3 and 4.4% for MeHg(+), PhHg(+) and Hg(2+), respectively. The developed method was successfully applied for the determination of the three mercury species in environmental water samples and biological samples of human hair and ocean fish.
  Talanta 03/2009; 77(4):1381-7. · 3.79 Impact Factor