研究了Meso 四 ( 3 ,5 二溴 4 羧基苯 )卟啉T(DBHP)P与铅的显色反应。在 0 0 8mol/LNaOH介质中 ,铅与T(DBHP)P反应生成 1∶2黄色配合物 ,λmax =479nm ,ε =2 .2× 10 5L·mol-1·cm-1。进一步研究表明 ,其二阶导数光度法有更高的灵敏度和选择性。由于该方法对钙、镁等金属离子的允许量较高 ,因而可以不经分离直接进行痕量铅的测定。 The color reaction of Meso tetrakis (3, 5 dibromo 4 carboxybenzene) porphyrin T (DBHP) P with lead was studied. In 0 0 8mol / L NaOH medium, lead reacted with T (DBHP) P to form a 1: 2 yellow complex with λmax = 479 nm and ε = 2.2 × 10 5 L · mol -1 cm -1. Further studies have shown that the second derivative spectrophotometry has a higher sensitivity and selectivity. Due to the high allowable amount of metal ions such as calcium and magnesium, the method can directly measure trace lead without separation.