摘要
在增敏剂溴代十六烷基吡啶和活化剂氨基乙酸存在下,钴对高碘酸钾氧化酸性铬兰K的反应具有催化作用,据此建立了一种测定痕量钴(Ⅱ)的新方法。考察该反应的最佳条件,测定反应动力学参数。在表面活性剂和活化剂存在下,本法灵敏度提高12倍。线性范围为0~100μg/L,检出限为9.06×10-7g/L。此法用于茶叶、VB12等样品中钴的测定,结果令人满意。
A new catalytic spectrophotometrin method for the determination of trace amounts of Co( Ⅱ ) has been developed. The method is based on the catalytic effect of Cobalt( Ⅱ)on oxidation of acid chrome blue K by potassium periodate with aminoacetic acid as an activator and cationic surfactant of cetyl pyridine bromide(CPB) as a sensitizer. The optimum conditions of reaction and kinetic parameters were assayed. On the optimum experimental conditions, the linear range is 0-100 μg/L, and the detection limit is 9.06× 10^-7 g/L. The sensitivity is increased by 12 times in the absence of the surfactant and activetor. The method can be used for the determination of cobalt(Ⅱ) in tea and Vitamin B 12 samples with satisfactory results.
出处
《食品科学》
EI
CAS
CSCD
北大核心
2008年第1期228-230,共3页
Food Science
关键词
催化动力学光度法
钴
高碘酸钾
酸性铬兰K
溴代十六烷基吡啶
氨基乙酸
catalytic spectrophotometry
cobalt
potassium periodate
acid chrome blue K cetyl pyridine bromide(CPB)
amino acetic acid(AAA)