5-(4-磺酸铀苯偶氮)-8-氨基喹啉与镍的显色反应研究

Studies on Colour Reaction of Nickel(Ⅱ) with 5-(4-sodium sulfonate Phhenylazo)-8-aminoquinoline

研究了５－（４－磺酸钠苯偶氮）－８－氨基喹啉（ＳＰＡＱ）与镍的显色反应及其最佳条件。在ＣＴＭＡＢ存在下，强碱性介质中，ＳＰＡＱ与镍形成２：１的红紫色络合物，其最大吸收峰位于５９８ｎｍ处，摩尔吸光系数为２．０×１０５Ｌ·ｍｏｌ－１·ｃｍ－１；镍量在０～２０μｇ／５０ｍｌ范围内符合比尔定律。方法已用于矿石中微量镍的测定。

The colour reaction of nickel(Ⅱ) with 5-(4-sodium sulfonate phenylazo)-8-aminoquinoline(SPAQ) and its optimum conditions have been investigated.A method for the spectrophotometric determination of nickel with SPAQ has been developed.In the presence of cetyltrimethylammonium bromide,SPAQ reacts with nickel(Ⅱ) in alkaline solution to form a 1:2 complex which exhibits a maximum absorbance at 598nm.The molar absorptivity of the complex is found to be 2.0×10 5.Beer's law is obeyed over the concentration range 0～20μg/50ml for nickel.The method has been used for the determination of microamounts of nickel in real samples with satisfactory results.