论文部分内容阅读
测定饮用水中的微量铜,除经典的吡咯烷二硫代氨基甲酸铵—甲基异丁基酮萃取一原子吸收法外,文献中报道有离子交换-原子吸收法,活性炭吸附富集-原子吸收法,松香共沉淀浮选法,铜-无色荧光素-H_2O_2体系催化荧光法,电位溶出分析法等,但用溶剂浮选吸光光度法测定,还未见报道。我们以二乙基二硫代氨基甲酸钠(Na-DDTC)为捕集剂,用溶剂浮选吸光光度法测定了辽化地区自来水中的铜含量,取得满意的结果。试验部分一试剂与仪器铜标准溶液: 1 1mg·ml~(-1),将3.9280gCuSO_4·5H_2O溶于含有1ml浓H_2SO_4的水中,于1000ml量瓶中,用去离子水稀释至刻度。
Determination of trace amounts of copper in drinking water, in addition to the classic pyrrolidine dithiocarbamate - methyl isobutyl ketone extraction - atomic absorption method, reported in the literature ion exchange - atomic absorption method, activated carbon adsorption enrichment - atomic Absorption method, rosin coprecipitation flotation method, copper - colorless fluorescein - H 2 O 2 catalytic fluorescence spectrometry, potentiometric stripping analysis, etc., but the solvent flotation spectrophotometry has not been reported. We use sodium diethyldithiocarbamate (Na-DDTC) as collector, and determine the copper content in tap water in Liaohua area by solvent flotation spectrophotometry, and obtain satisfactory results. Test part of a reagent and the instrument standard solution of copper: 1 1 mg · ml -1, 3.9280gCuSO_4 · 5H_2O dissolved in water containing 1ml H_2SO_4 in 1000ml volumetric flask, diluted with deionized water to the mark.