Abstract：The condition of the color reaction meso-T( 4-phexamethoxy-3-sulfophonyl)porphyrin w ith cobalt were studied at pH4. 15. It has been show n that the maximum absorption wavelengths of the reagent and the complex respectively are 440nm and 427nm. After color reaction finished, the system was acidify to pH 2. 63,the complex can not be resolved. The results show that the ion of reaction w ith porphyrin is cobalt(Ⅱ). The coordination ratio of Co(Ⅱ)to T( 4 -MO-3-SP) P is 1∶ 1. The apparent molar absorption coefficient is 1. 95×105L·mol-1·cm-1. Beer' s law is obey in concentration range of 0～ 3. 0μ g/25mL. This method has been applied to the determination of micro Co(Ⅱ)in vitamin B12 . The results are favorable agreed with that obtained by AAS.
陈秀华 蔡国权 . Meso-四( 4-甲氧基-3-磺酸苯基) 卟啉 与钴的显色反应及其钴的价态研究
[J]. 浙江大学学报（理学版）, 1998, 25(4): 59-62.
Chen Xiuhua Cai Guoquan . Study on the Spectrophotometric Determination of Cobalt with Meso-T( 4-MO-3-SP) P and Its Valence Species
. Journal of ZheJIang University(Science Edition), 1998, 25(4): 59-62.