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钴的光度分析法,近年来已有评述。已往常用的试剂有亚硝基R盐、PAR、亚硝基-DMAP、2,6-二氨基-3,2’-偶氮吡啶等。用这些试剂测钴,摩尔消光系数在10~4数量级。近年来柴田提出了4-[(2-吡啶)偶氮]-1,3-二氨基苯(简称PADAB,下同)类试剂和5-[(2-吡啶)偶氮]-2,4-二氨基甲苯(简称PADAT,下同)类试剂。这些试剂可与钴形成紫色络合物,摩尔消光系数达10~5。尤其是在PADAT类试剂的苯环中引入甲基后,其选择性更高,可允许有
Cobalt spectrophotometry, has been reviewed in recent years. Formerly used reagents are nitroso R salt, PAR, nitroso-DMAP, 2,6-diamino-3,2’-azobis pyridine and so on. Cobalt with these reagents, the molar extinction coefficient in the order of 10 to 4. In recent years, Shibata put forward 4 - [(2-pyridyl) azo] -1,3-diaminobenzene (hereinafter referred to as PADAB, the same below) Diaminotoluene (referred to as PADAT, the same below) reagents. These reagents form a purple complex with cobalt with a molar extinction coefficient of 10-5. In particular, the introduction of methyl groups in the benzene ring of PADATs is more selective and allows