钛铁试剂分光光度法测定氯化钾无氰镀镉溶液中的铁杂质  

Determination of iron impurities in cyanide-free potassium chloride cadmium plating bath by spectrophotometry with Tiron as color development agent

作　　者：郭崇武[1] 陈建锐[1] 李小花 

机构地区：[1]广州超邦化工有限公司,广东广州510460

出　　处：《电镀与涂饰》2017年第24期1325-1326,共2页Electroplating & Finishing

摘　　要：利用铁离子与钛铁试剂(即邻苯二酚-3,5-二磺酸钠)生成红色配合物的特效显色反应,制定了氯化钾无氰镀镉溶液中铁杂质的分析方法。用氨-氯化铵缓冲溶液调节试液的pH至9.2,以空白底液作参比,在波长480nm处测定吸光度。测定结果的相对平均偏差为0.35%,回收率为99.3%~100.9%。A spectrophotometric method for determining iron impurities in a cyanide-free potassium chloride cadmium plating bath was established based on the specific color development reaction of ferric ions with disodium 1,2-dihydroxybenzene-3,5-disulfonate （also called Tiron）. The pH of the solution to be tested is adjusted to 9.2 by ammonia-ammonium chloride buffer. The absorbance of the chromogenic solution is determined at a wavelength of 480 nm with the blank solution as reference. The method features a relative average deviation of 0.35% and a recovery ranging from 99.3% to 100.9%.

关 键 词：氯化钾无氰镀镉溶液 铁杂质 钛铁试剂 分光光度法 测定 

分 类 号：TQ153.17[化学工程—电化学工业] O655.25[理学—分析化学]