催化动力学光度法测定锡-钴-锌三元合金镀液中的钴  

Determination of Cobalt in Tin-Cobalt-Zinc Alloy Plating Bath by Catalytic Dynamic Spectrophotometric Method

作　　者：郭振良[1] 牟起娜 唐清华[1] 孙言志[1] 

机构地区：[1]鲁东大学化学与材料科学学院,山东烟台264025 [2]烟台汽车工业学校,山东烟台265500

出　　处：《材料保护》2005年第11期69-70,共2页Materials Protection

摘　　要：在HC l介质、沸水浴中,Co2+能催化铋酸钠氧化硫堇褪色反应,据此建立了催化动力学光度法测定Co2+的新方法。Co2+在0~50μg/mL范围内遵守比尔定律,表观摩尔吸光系数为3.494×104L.mol/cm,检出限量为0.052 05μg/mL。该催化反应用于锡-钴-锌三元合金镀液中钴含量的测定,结果令人满意。A new determination method of Co^(2+) was built according to the oxidation fading reaction of sodium bismuthate and thionine catalyzed by Co^(2+) in boiling hydrochloride solution.Beer' law was obeyed as Co^(2+) concentration is in the region of 0~50 μg/mL,the apparent molar absorptivity is 3.494×10~4(L·mol/cm),and the detection limit is 0.052 05 μg/mL.The method can be used in concentration determination of Co^(2+) in Sn-Co-Zn alloy plating bath with satisfactory result.

关 键 词：钴的测定 催化动力学 光度法 硫堇 

分 类 号：TQ153[化学工程—电化学工业]