新型指示反应催化分光光度法测定痕量钴

[Catalytic spectrophotometry for the determination of trace cobalt by the new indicating reaction].

作者信息

Qi Yan-juan, Wang Xiao-ju, Li Hong-mei, Gao Hong-wei

机构信息

Department of Chemistry, Changchun Normal College, Changchun 130032, China.

出版信息

Guang Pu Xue Yu Guang Pu Fen Xi. 2002 Jun;22(3):449-50.

PMID:12938331

Abstract

A kinetic spectrophotometric method for the determination of trace cobalt(II) was established. It was based on the Co(II) catalyzing the discoloring reaction of malachite green by potassium periodate in the presence of HBO3-Na2B4O7 solution (pH = 8.5). The sensitivity of the method is 2.1 x 10(-10) g.mL-1. The range of determination is 0-0.8 microgram.25 mL-1. The apparent activation of catalytic reaction is 37.94 kJ.mol-1. The method has been applied to the determination of cobalt in tea leaf and injection of vitamin B12 samples with satisfactory results.

摘要

建立了一种动力学分光光度法测定痕量钴（II）。该方法基于在HBO3-Na2B4O7溶液（pH = 8.5）存在下，钴（II）催化高碘酸钾使孔雀石绿褪色的反应。该方法的灵敏度为2.1×10（-10）g·mL-1。测定范围为0 - 0.8微克·25 mL-1。催化反应的表观活化能为37.94 kJ·mol-1。该方法已应用于茶叶和维生素B12注射液样品中钴的测定，结果令人满意。