论文部分内容阅读
三价铬的测定在水、食品和环境分析等方面日益为人们所重视.我们在前人工作的基础上,建立了在乳化剂聚乙二醇辛基苯基醚(OP)存在下,三价铬与2-(5-溴-吡啶偶氮-2)-5-二乙氨基苯酚(5-Br-PADAP)及三乙醇胺(TEA)的显色反应,TEA对显色反应有很强的加速作用,在微沸的水浴中只需5min即可形成稳定的紫红色络合物,以柠檬酸钠、EDTA为掩蔽剂,应用于不锈钢餐具中三价铬的测定,方法灵敏度高,选择性好.结果较满意.1 材料与方法1.1 试剂与仪器 三价铬标准溶液:准确称取金属铬(99.99%)0.5000g,加入5.0ml盐酸(1+1)溶解,
The determination of trivalent chromium has been paid more and more attention in the fields of water, food and environmental analysis, etc. Based on the previous work, we established a method for the determination of trivalent chromium in the presence of emulsifier polyethylene glycol octylphenyl ether (OP) The chromogenic reaction of chromium with 2- (5-bromo-pyridylazo-2) -5-diethylaminophenol and triethanolamine (TEA), the strong color reaction of TEA Accelerate the action in a slightly boiling water bath in just 5min to form a stable purple complex with sodium citrate, EDTA as masking agent, used in the determination of trivalent chromium in stainless steel tableware, high sensitivity, selectivity Good results satisfactory.1 Materials and methods 1.1 reagents and equipment trivalent chromium standard solution: accurately weighed metal chromium (99.99%) 0.5000g, add 5.0ml hydrochloric acid (1 + 1) dissolved,