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卟啉的衍生物作为光度试剂测定铜,主要有TPPS_3、TPP、T(3-MPy)P、T(4-MPy)P和T(4-SP)P等。这些卟啉类化合物都有共同的母体—卟吩核,与铜(Ⅱ)形成稳定的络合物(络合比为1∶1),在波长400—500nm之间有一极强的吸收带(通称Soret带),其摩尔吸光系数在2—5×10~5之间,反应具有很高的灵敏度和良好的选择性。在表面活性剂或还原剂存在下,可在水相以直接光度法测定铜,也有用萃取分光光度法测定超微量铜。在应用上,双波长分光光度法测定海水
Porphyrin derivatives were used as photometric reagents for the determination of copper, mainly TPPS_3, TPP, T (3-MPy) P, T (4-MPy) P and T (4-SP) These porphyrins all have a common parent porphin nucleus, forming a stable complex with copper (II) (complex ratio of 1: 1), with a very strong absorption band between 400-500 nm Commonly known as Soret), the molar absorption coefficient between 2-5 × 10 ~ 5, the reaction has a high sensitivity and good selectivity. In the presence of a surfactant or a reducing agent, copper can be measured by direct photometry in the aqueous phase and also by extractive spectrophotometry. In application, dual wavelength spectrophotometric determination of seawater