以溴代十六烷基吡啶为增敏剂催化动力学光度法测定痕量钴(Ⅱ)

食品科学 ›› 2008, Vol. 29 ›› Issue (1): 231-233.

以溴代十六烷基吡啶为增敏剂催化动力学光度法测定痕量钴(Ⅱ)

王晓菊, 郭飞君, 盖永胜

长春师范学院化学系；长春师范学院化学系吉林长春130032；吉林长春130032；

出版日期:2008-01-15 发布日期:2011-07-28

Catalytic Spectrophotometric Method for Determination of Trace Cobalt(Ⅱ) with Cetyl Pyridine Bromide as Sensitizet

WANG Xiao-Ju, GUO Fei-Jun, GAI Yong-Sheng

Department of Chemistry, Changchun Teachers College, Changchun 130032, China

Online:2008-01-15 Published:2011-07-28

摘要/Abstract

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。

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

Abstract: 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 0～100μg/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 B12 samples with satisfactory results.

Key words: catalytic spectrophotometry, cobalt, potassium periodate, acid chrome blue K cetyl pyridine bromide (CPB), amino acetic acid(AAA)

王晓菊, 郭飞君, 盖永胜. 以溴代十六烷基吡啶为增敏剂催化动力学光度法测定痕量钴(Ⅱ)[J]. 食品科学, 2008, 29(1): 231-233.

WANG Xiao-Ju, GUO Fei-Jun, GAI Yong-Sheng. Catalytic Spectrophotometric Method for Determination of Trace Cobalt(Ⅱ) with Cetyl Pyridine Bromide as Sensitizet [J]. FOOD SCIENCE, 2008, 29(1): 231-233.

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