Chromium（Ⅵ）can react with diphenylcarbazide（DPC）in perchloric acidic medium to form the complex of chromium（Ⅵ）-DPC which can be extracted with n-pentanol.This was used for the determination of trace chromium...Chromium（Ⅵ）can react with diphenylcarbazide（DPC）in perchloric acidic medium to form the complex of chromium（Ⅵ）-DPC which can be extracted with n-pentanol.This was used for the determination of trace chromium（Ⅵ）and chromium（Ⅲ）in river water by flame atomic absorption spectrometry.KMnO4 was used as the oxidant for the oxidation of chromium（Ⅲ）to chromium（Ⅵ）which was then determined by the same way.The limit of detection was 0.0007 mg·L-1and Beer’s law was obeyed in a wide linear dynamic range of 0.0007～1.0 mg·L-1chromium（Ⅵ）.The recovery of chromium（Ⅵ）and chromium（Ⅲ）was 100%～112%and 89%～104%,respectively.展开更多
Closed-vessel microwave-assisted digestion was utilized for the decomposition of hard-to-dissolve optical glass samples for the determination of the ultra trace amount of cadmium by electrothermal evaporation atomic f...Closed-vessel microwave-assisted digestion was utilized for the decomposition of hard-to-dissolve optical glass samples for the determination of the ultra trace amount of cadmium by electrothermal evaporation atomic fluorescence spectrometry（ETV-AFS）and arsenic and lead by hydride generation atomic fluorescence spectrometry（HG-AFS）.The limits of detection were found to be 0.08,0.1 and 0.7ngmL-1for cadmium,arsenic and lead,respectively.Relative standard deviation（RSD）was between 2%-5% which was adequate for trace analysis.The analytical results were in good agreement with those obtained by inductively coupled plasma mass spectroscopy（ICP-MS）for cadmium and inductively coupled plasma atomic emission spectrometry（ICP-AES）for arsenic and lead.展开更多
文摘Chromium（Ⅵ）can react with diphenylcarbazide（DPC）in perchloric acidic medium to form the complex of chromium（Ⅵ）-DPC which can be extracted with n-pentanol.This was used for the determination of trace chromium（Ⅵ）and chromium（Ⅲ）in river water by flame atomic absorption spectrometry.KMnO4 was used as the oxidant for the oxidation of chromium（Ⅲ）to chromium（Ⅵ）which was then determined by the same way.The limit of detection was 0.0007 mg·L-1and Beer’s law was obeyed in a wide linear dynamic range of 0.0007～1.0 mg·L-1chromium（Ⅵ）.The recovery of chromium（Ⅵ）and chromium（Ⅲ）was 100%～112%and 89%～104%,respectively.
文摘Closed-vessel microwave-assisted digestion was utilized for the decomposition of hard-to-dissolve optical glass samples for the determination of the ultra trace amount of cadmium by electrothermal evaporation atomic fluorescence spectrometry（ETV-AFS）and arsenic and lead by hydride generation atomic fluorescence spectrometry（HG-AFS）.The limits of detection were found to be 0.08,0.1 and 0.7ngmL-1for cadmium,arsenic and lead,respectively.Relative standard deviation（RSD）was between 2%-5% which was adequate for trace analysis.The analytical results were in good agreement with those obtained by inductively coupled plasma mass spectroscopy（ICP-MS）for cadmium and inductively coupled plasma atomic emission spectrometry（ICP-AES）for arsenic and lead.
