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
The N,N,N’,N’-tetrabutsuccinylamide（TBSA） was synthesized and purified.The extractability of this diamide for Terbium（Ⅲ） has been studied.The effects of concentrations of nitric acid,extractant,and LiNO3 as wel...The N,N,N’,N’-tetrabutsuccinylamide（TBSA） was synthesized and purified.The extractability of this diamide for Terbium（Ⅲ） has been studied.The effects of concentrations of nitric acid,extractant,and LiNO3 as well as the temperature influence on the extraction distribution ratios were investgated in detail.The apparent equilibrium constant of extraction has been determined to be（0.77±0.02）L6/mol6at 298K.The enthalpy of the extraction was -25.64kJ·mol-1.The composition of the extracted species was found to be Tb（NO3）3·3TBSA,which was characterized by IR spectromery.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The N,N,N’,N’-tetrabutsuccinylamide（TBSA） was synthesized and purified.The extractability of this diamide for Terbium（Ⅲ） has been studied.The effects of concentrations of nitric acid,extractant,and LiNO3 as well as the temperature influence on the extraction distribution ratios were investgated in detail.The apparent equilibrium constant of extraction has been determined to be（0.77±0.02）L6/mol6at 298K.The enthalpy of the extraction was -25.64kJ·mol-1.The composition of the extracted species was found to be Tb（NO3）3·3TBSA,which was characterized by IR spectromery.
