分光光度法测定低氰镀锌溶液中硫脲的含量  

Spectrophotometric Determination of Thiourea in Low-Cyanide Zinc Plating Bath

作　　者：王孝熔[1] 

机构地区：[1]烟台师范学院化学系

出　　处：《电镀与涂饰》1996年第1期34-36,共3页Electroplating & Finishing

摘　　要：根据硫脲在ｐＨ２～３醋酸介质中可被ＮａＮＯ２氧化成ＨＳＣＮ，利用ＨＳＣＮ与Ｆｅ（ＮＯ３）３反应生成红色的硫氰酸铁配合物的性质，建立了分光光度法测定低氰镀锌液中硫脲合量的方法。该方法线性范围为０～２．５ｍｇ／２５ｍＬ，回收率为９８．８～１０２．５％。The method is based on the fact that thiourea can be oxidized to HSCN by NaNO2 in acetic acid solution at pH 2￣3, and HSCN reacts with Fe (NO3 )3 to form red iron(Ⅲ) - thiocyanate complex which is detectable by spectrophotometry with a linear range of 0￣2.5mg/25mL, and a recovery of 98.8 ￣ 102.5%.

关 键 词：分光光度法 镀锌 硫脲 镀液 电镀 

分 类 号：TQ153.15[化学工程—电化学工业]