磷化液中钼的分光光度法测定  

Spectrophotometric Determination of Molybdenum in Phosphating Solution

作　　者：戴永盛[1] 裴如俊 戴惠 

机构地区：[1]天津市机电工业控股集团公司,天津300100 [2]天津市环境监测中心,天津300191 [3]展华电子精密仪器服务有限公司,北京100037

出　　处：《电镀与精饰》2007年第4期49-51,共3页Plating & Finishing

摘　　要：采用硫氰酸盐为显色剂的分光光度法,直接测定在磷化液中以钼酸盐作为磷化加速剂里的钼,采用弱还原剂硫脲,用铜盐催化加快显色速度,用Fe2+为显色液的稳定剂,生成的橙红色配合物。经试验测定钼在50～300μg范围内,符合比耳定律。λmax=460 nm;摩尔吸光系数ε460=9.65×103;回归方程为:A=2.01×10-3.ρ+0.084;相关系数=0.999。方法具有操作简单、准确度高的优点。Spectrophotometry with thiocyanate as developer was employed to directly determining molybdenum in molybdate used as an accelerator in phosphating solution. This method uses a weak reducing agent thiourea, a copper salt as a catalyst to speed up the developing reaction and Fe^2＋ as a stablizer of the developed solution forming an orange red complex. It is determined through experiment testing that when molybdenum in the solution is in the range of 1 000-6 000 μg/L the solution conforms to the Bill law. The maximum absorption wavelength λmax=460 nm. The mol absorptivity ε460=9.65×10^3. The regression equation is A=2.01×10^-3·ρ＋0.084. The correlation coefficient r is 0. 999. This method has advantages of simple in operation and high accuracy.

关 键 词：磷化加速剂 钼 分光光度法 硫氰酸盐 催化 稳定剂 

分 类 号：TG115.335[金属学及工艺—物理冶金]