铅、镉-卟啉配合物的研究及其分析应用  

Study and Analytic Application of theLead and Cadmium Porphyrin Complexes

作　　者：李方[1] 侯旭[1] 张新申[2] 

机构地区：[1]四川大学化学学院,成都610064 [2]四川大学皮革化学与工程教育部重点实验室,成都610065

出　　处：《四川大学学报（自然科学版）》2003年第2期305-309,共5页Journal of Sichuan University(Natural Science Edition)

基　　金：四川省科技厅应用基础研究基金 (0 2GY0 2 9 0 3 8)

摘　　要：研究了卟啉与铅、镉的反应及其相应配合物的电子吸收光谱。并结合巯基棉富集分离方法 ,将该具有特定光学性质的分析体系成功地应用于中药中痕量铅、镉的测定 .方法简便 ,测定体系抗干扰的效果好 ,灵敏度高 .对Pb(Ⅱ )、Cd(Ⅱ )的摩尔吸光系数分别为 2 .5× 10 5L·mol- 1·cm- 1和 5 .1× 10 5L·mol- 1·cm- 1.实际样品测定的RSD在 3.3%～ 13.0 %之间 .样品加标回收率在 85 %～ 110In this research article, the reaction of α β γ δ Tetra(p sulfophenyl)porphyrin(TPPS 4) with Pb(Ⅱ)or Cd(Ⅱ) has been studied, and the spectrums of the Pb(Ⅱ) TPPS 4 and Cd(Ⅱ) TPPS 4 shown the spectral absorption of these complexes with high sensitivity. So the molar absorptivities of Pb(Ⅱ) TPPS 4 and Cd(Ⅱ) TPPS 4 are 2.5×10 5 L·mol -1 ·cm -1 and 5.1×10 5 L·mol -1 ·cm -1 respectively. With the sulfhydryl cotton fiber separation enrichment method, this analytical system of porphyrin complexes has been successfully applied to determining the trace amounts of Pb(Ⅱ)and Cd(Ⅱ) in Ginkgo biloba L. leave and tea. The RSD of determining 10 -6 ～10 -7 g/g Pb(Ⅱ)or Cd(Ⅱ) in samples lies between 3.3%～13.0%, and the recovery of added standard lies between 85%～110%.The proposed analytical method has the advantage of high sensitivity, simplicity and high efficiency of interfere resisting.

关 键 词：卟啉金属配合物 铅 镉 巯基棉 分离富集 电子吸收光谱 光学性质 摩尔吸光系数 显色剂 

分 类 号：O657.32[理学—分析化学]