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卟啉类试剂是一种高灵敏显色剂,其金属络合物的摩尔吸光系数大都在10~5以上,有的甚至达10~6数量级。应用该类试剂进行痕量金属离子测定已有不少报道、用meso-四(对三甲铵基苯)卟啉光度法测定铅的工作也有发表。这一方法虽有很高的灵敏度,但
Porphyrin reagent is a highly sensitive reagent, the molar absorption coefficient of the metal complexes are mostly in the 10 ~ 5 or more, and some even up to 10 to 6 orders of magnitude. There are many reports on the determination of trace metal ions using such reagents. The work on the determination of lead by meso-tetra (p-trimethylaminophenyl) porphyrin spectrophotometry has also been published. Although this method has a high sensitivity, however