光度法测定微量钴的方法报道不少,但大多都不甚完美,因而在实际应用中受到一定限制。常用的亚硝酸R盐法,虽然该法选择性尚可,但其灵敏度不高。近年来发展的卟啉类显色剂虽然灵敏度很高,但方法的选择性较差。三氮烯类试剂是一类广泛用于Cd(Ⅱ)、Hg(Ⅱ)分析的显色剂,但用于Co(Ⅱ)的光度分析,文献只有萃取光度法报道。为革除在萃取过程中有毒试剂的采用和提高分析速度,本文作者首次把新近合成的三氮烯类新显色剂之一——2,6-二氯-4-氨磺酰基苯基重氮氨基偶氮苯(DCSDAA)用于胶束增溶光度法测定微量钴获得了成功。在TritonX-100存在下,于硼砂-氢氧化钠缓冲液(pH 10.7)介质中,钴与该试剂生成稳定的红色络合物,其最大吸收波长位于537nm处,摩尔吸光系数可达1.73×10~5, There are a lot of methods for the determination of trace cobalt by photometry, but most of them are not perfect, so they are limited in practical application. R salt of nitrite commonly used method, although the selectivity of the law is acceptable, but its sensitivity is not high. In recent years, the development of porphyrin reagent although the sensitivity of high sensitivity, but the selectivity of the method is poor. Triazene reagents are a class of chromogenic reagent widely used in the analysis of Cd (II) and Hg (II), but are only used for the photometric analysis of Co (II). In order to get rid of the adoption of toxic reagents in the extraction process and improve the speed of analysis, the authors for the first time put one of the newly synthesized triazoles new reagent - 2,6-dichloro-4-sulfamoylphenyl diazide Amino azobenzene (DCSDAA) has been used successfully in micellar solubilization spectrophotometry for the determination of trace cobalt. In the presence of Triton X-100, cobalt forms a stable red complex with this reagent in a borax-sodium hydroxide buffer (pH 10.7) medium with a maximum absorption wavelength at 537 nm and a molar extinction coefficient of 1.73 × 10 ~ 5,