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络天青常用于铝、铍等金属元素的光度测定,但用于测定铜时的摩尔吸光系数比前者高。本文在pH为5.0～6.0下,不加表面活性剂,在适当掩蔽剂存在下,利用络天青与铜生成的络合物在583.5nm处有强烈特征吸收。可用于各种合金、岩石、污水和多种食物中微量铜的测定。 1 试验部分 1.1 仪器与试剂 GBC UV/VIS 916型紫外可见分光光度计 VIS-723型分光光度计 DZ-Z型酸度计 TH-2型恒温水浴 铜标准溶液;0.1mg·ml~(-1) 络天青标准溶液:1g·L~(-1),用乙醇(1+1)溶液配制。 缓冲溶液:六次甲基四胺40g,加水90ml,6mol·L~(-1)盐酸20ml,稀释至500ml。
Cymbalta commonly used in aluminum, beryllium and other metal elements photometric determination, but when used for the determination of copper molar extinction coefficient higher than the former. In this paper, at a pH of 5.0-6.0, no surfactant was added and the complex formed by cypermethrin and copper was strongly adsorbed at 583.5 nm in the presence of a suitable masking agent. Can be used for a variety of alloys, rocks, sewage and a variety of food trace determination of copper. 1 Experimental 1.1 Instruments and reagents GBC UV / VIS 916 UV-Vis spectrophotometer VIS-723 spectrophotometer DZ-Z acidimeter TH-2 type thermostatic water bath copper standard solution; 0.1mg · ml -1 Cystatin standard solution: 1g · L -1, formulated with ethanol (1 + 1) solution. Buffer solution: hexamethylenetetramine 40g, add water 90ml, 6mol · L ~ (-1) hydrochloric acid 20ml, diluted to 500ml.