【摘要】 本文研究了弱酸性介质中钴（Ⅱ）与ＴＰＰＳ４的显色反应条件。实验发现胺类化合物质子化后，不参与成络反应，而均能使ＴＰＰＳ４试剂的吸光度大大降低，从而提高了测定的灵敏度，Ｃｏ（Ⅱ）－ＴＰＰＳ４络合比为１：１，ε＿（４２６）＝３．５４×１０￣５，钴含量在０～５．０μｇ／２５ｍＬ范围内呈线性，并用于烟草、茶叶中痕量钴的测定，得到了满意的结果。更多还原

【Abstract】 he condition of the color reaction ofmesotetrakis（4-sulfophenyl）porphyrin with Co（Ⅱ）were studied in the presence of ethylene diamine andsome other aminocompounds at pH4.0.It was foundthat the protonated aminocompound can react withTPPS₄ and become electroneutral,therefore theabsorption of TPPS₄ declines and the sensitivity of thecomplex increases,The complex has maximumabsorption at 426nm with a mola absorbtivitycofficient of 3.54 ×10￣5L. mol￣（-1）. cm￣（-1）.The calibrationcurve is linear in the range of 0 to 5 μg/25mL for Co（Ⅱ）,This method has been applied to thedetermination of Co（Ⅱ）intea-leave and tobacco withsatisfactory results.更多还原