Autocatalytic decomposition of cobalt complexes as an indicator system for the determination of trace amounts of cobalt and effectors
Autocatalytic decomposition of cobalt complexes as an indicator system for the determination of trace amounts of cobalt and effectors
复制标题
钴配合物的自催化分解作为测定痕量钴和效应物的指示系统
DOI：
10.1039/an9962100391
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发表时间：
1996
期刊：
影响因子：
4.2
通讯作者：
T. Yotsuyanagi
中科院分区：
文献类型：
--
作者：
M. Endo;Masahito Ishihara;T. Yotsuyanagi
从理论上考虑了利用金属络合物的自催化降解反应建立测定超痕量金属离子的恒灵敏度检测系统的可能性。这一想法是通过使用以硫代过氧单硫酸盐为氧化剂、钴离子为催化剂的惰性CoIII–2-(5-bromo-2-pyridylazo)-5-(N-propyl-N-sulfopropylamino)phenolate络合物的氧化分解来实现的。吸光度-时间曲线的拐点时间受钴(II)离子和过量配体等效应物的控制。基于这些性质，该体系被成功地应用于钴离子和效应剂的10-10moldm-3水平的光度测定。该方法不需要测量速率常数。
From theoretical considerations, the possibility of developing a constant sensitivity detection system for the determination of ultratrace levels of metal ions by the use of an autocatalytic degradation reaction of metal complexes was considered. The idea was realized by the use of the oxidative decomposition of the inert CoIII–2-(5-bromo-2-pyridylazo)-5-(N-propyl-N-sulfopropylamino)phenolate complex with peroxomonosulfate as oxidant and cobalt ion as catalyst. The inflection time of the absorbance–time curve is controlled by effectors such as cobalt(II) ion and ligands present in excess. Based on these properties, the system was successfully applied to the spectrophotometric determination of 10–10 mol dm–3 levels of cobalt ion and 10–5 mol dm–3 levels of effectors. The method does not require measurement of the rate constants.