Gao Hong-Wen, Lu Xiao-Qiao, Ren Jiao-Rong
Key Laboratory of Yangtze Water Environment of Ministry of Education, College of Environmental Science and Engineering, Tongji University, Shanghai, PR China.
Anal Sci. 2005 Sep;21(9):1043-9. doi: 10.2116/analsci.21.1043.
The chromophore, 3-(5-chlor-2-hydroxy-3-sulfophenylazo)-6-(2,4,6-tribromophenylazo)-4,5-dihydroxynaphthalene-2,7-disulfonic acid (CSTDD) was used to complex Cu(II) and Co(II) in aqueous solution at pH 9.43. A binuclear complex of Cu-CSTDD-Co was formed and showed a high selectivity for the determination of Co(II). The spectral correction technique was applied to characterize the complexes. The results showed the formation of complexes of Cu(CSTDD), Co(CSTDD)3 and Cu2(CSTDD)2Co. The quantitative analysis of Co(II) at ng/ml level was carried out by the light-absorption ratio variation approach (LARVA). The results showed that the technique is satisfactory to determine Co(II) at trace level in water samples with a detection limit of 2.3 ng/ml.
发色团3-(5-氯-2-羟基-3-磺基苯基偶氮)-6-(2,4,6-三溴苯基偶氮)-4,5-二羟基萘-2,7-二磺酸（CSTDD）用于在pH 9.43的水溶液中与铜（II）和钴（II）络合。形成了Cu-CSTDD-Co双核络合物，对钴（II）的测定具有高选择性。应用光谱校正技术对络合物进行表征。结果表明形成了Cu(CSTDD)、Co(CSTDD)3和Cu2(CSTDD)2Co络合物。采用吸光率变化法（LARVA）对纳克/毫升水平的钴（II）进行定量分析。结果表明，该技术用于测定水样中痕量钴（II）令人满意，检测限为2.3纳克/毫升。
