Gas chromatography/inductively coupled plasma mass spectrometry (GC/ICP-MS) coupled with solid phase micro-extraction can provide a simple, extremely selective and sensitive technique for the analysis of volatile sulf...Gas chromatography/inductively coupled plasma mass spectrometry (GC/ICP-MS) coupled with solid phase micro-extraction can provide a simple, extremely selective and sensitive technique for the analysis of volatile sulfur and selenium compounds in the headspace of growing plants. In this work, the technique was used to evaluate the volatilization of selenium in wild-type and genetically-modified Brassica juncea seedlings. By converting toxic inorganic selenium in the soil to less toxic, volatile organic selenium, B. juncea might be useful in bioremediation of selenium contaminated soil.展开更多
Inductively-coupled plasma mass spectrometry (ICP-MS) has made much progress since its birth in the late 1990s. This paper will give a rather systematic overview on the use of this technique in new devices and technol...Inductively-coupled plasma mass spectrometry (ICP-MS) has made much progress since its birth in the late 1990s. This paper will give a rather systematic overview on the use of this technique in new devices and technologies related to plasma source, sample-introducing device and detecting spectrometer etc. In this overview, an emphasis will be put on the evaluation of the ICP- MS technique in combination with a series of physical, chemical and biological techniques, such as laser ablation (LA), capillary electrophoresis (CE) and high performance liquid chromatograph (HPLC), along with their representative high accuracy and high sensitivity. Finally, comprehensive and fruitful applications of the ICP-MS and its combinative techniques in the detection of trace metallic elements and isotopes in complex biological and environmental samples will be revealed.展开更多
建立了四甲基氢氧化铵(TMAH)提取-高分辨电感耦合等离子体质谱法测定头发中碘含量。取干燥剪碎后的头发样品0.1 g,置于耐高温的50 m L塑料离心管中,加入5 m L质量分数为2%的TMAH溶液,旋紧盖子,涡旋1min后,于恒温干燥箱中(85±5)℃提...建立了四甲基氢氧化铵(TMAH)提取-高分辨电感耦合等离子体质谱法测定头发中碘含量。取干燥剪碎后的头发样品0.1 g,置于耐高温的50 m L塑料离心管中,加入5 m L质量分数为2%的TMAH溶液,旋紧盖子,涡旋1min后,于恒温干燥箱中(85±5)℃提取3 h。冷却后用水定容至标线,离心,取上层清液,用0.45μm滤膜过滤,以高分辨电感耦合等离子体质谱仪测定滤液中碘含量。以铑作为内标元素校正仪器信号漂移,选择合适的分辨率,有效消除基体效应及多原子离子产生的质谱干扰。碘的质量浓度在0~20.0 ng/m L内与对应的质谱信号强度线性相关,检出限为0.005 58 mg/kg。该方法用于国家一级标准物质和实际样品的分析,测定值的相对误差为1.25%,测定值的相对标准偏差为3.55%~4.59%(n=12),加标回收率为97.3%~104%。该方法简单、准确,适用于头发样品中碘含量的测定。展开更多
文摘Gas chromatography/inductively coupled plasma mass spectrometry (GC/ICP-MS) coupled with solid phase micro-extraction can provide a simple, extremely selective and sensitive technique for the analysis of volatile sulfur and selenium compounds in the headspace of growing plants. In this work, the technique was used to evaluate the volatilization of selenium in wild-type and genetically-modified Brassica juncea seedlings. By converting toxic inorganic selenium in the soil to less toxic, volatile organic selenium, B. juncea might be useful in bioremediation of selenium contaminated soil.
文摘Inductively-coupled plasma mass spectrometry (ICP-MS) has made much progress since its birth in the late 1990s. This paper will give a rather systematic overview on the use of this technique in new devices and technologies related to plasma source, sample-introducing device and detecting spectrometer etc. In this overview, an emphasis will be put on the evaluation of the ICP- MS technique in combination with a series of physical, chemical and biological techniques, such as laser ablation (LA), capillary electrophoresis (CE) and high performance liquid chromatograph (HPLC), along with their representative high accuracy and high sensitivity. Finally, comprehensive and fruitful applications of the ICP-MS and its combinative techniques in the detection of trace metallic elements and isotopes in complex biological and environmental samples will be revealed.
