DBC－偶氮氯膦光度法测定微量铜  

Spectrophotometric Determination of Microamount Copper with DBC－Chlorophosphonazo

作　　者：李民菁 

机构地区：[1]郑州铝厂研究所

出　　处：《冶金分析》1994年第3期24-26,共3页Metallurgical Analysis

摘　　要：在ＰＨ＝５时，Ｃｕ（Ⅰ）与ＤＢＣ－偶氮氯膦形成１：２的蓝色配合物，其最大吸收峰位于６１０ｎｍ处，摩尔吸光系数为９．１８×１０￣４，铜含量在０～２５μｇ／５０ｍｌ范围内符合比尔定律。采用氟化铵为掩蔽剂，已成功地应用于铝合金中铜的测定。Copper（Ⅰ）reacts with DBC- CPA to form a 1:2 bluw complex in acetate buffer soluti-on.The absorption maximum of the complex is at 610nm. Beer′s law is obeyed far 0-25μg copper in 50ml solution.The molar absorptivity is 9．8×10~4.In the presence of ammonium fluoride，this method has been applied direetly to determination of microamount copper in aluminium alloy with satisfac-tory results.

关 键 词：铜 分光光度法 铝合金 微量分析 

分 类 号：TG146.21[一般工业技术—材料科学与工程]