[Analysis of Pb(II), Cd(II) and Cu(II) in Chinese medicine by the system of porphyrin complexes and sulfhydryl cotton fiber].
The reaction of alpha beta gamma delta-tetra(p-sulfophenyl)porphyrin (TPPS4) with Pb(II), Cd(II) or Cu(II) has been studied in this article, and the spectra of the Pb(II)-TPPS4, Cd(II)-TPPS4 and Cu(II)-TPPS4 show the spectral absorption of these complexes with high sensitivity. The molar absorptivities of Pb(II)-TPPS4, Cd(II)-TPPS4 and Cu(II)-TPPS4 are 2.5 x 10(5) L x mol(-1) x cm(-1), 5.2 x 10(5) L x mol(-1) x cm(-1) and 4.2 x 10(5) L x mol(-1) x 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), Cd(II) and Cu(II) in Ginkgo bilobal leaves and tea leaves. The RSD of determining 10(-6)-10(-7) g x g(-1) Pb(II), Cd(II) or Cu(II) in samples lies between 3.3%-9.6%, and the recovery of added standard lies between 90%-103%. The proposed analytical method has the advantage of high sensitivity, simplicity and high efficiency of interfere-resisting.
Li
Fang
F
College of Chemistry, Sichuan University, Chengdu 610064, China.
Zheng
Huai-li
HL
D000327:Adsorption; D002104:Cadmium / Q000032:analysis*; D003300:Copper / Q000032:analysis*; D032561:Cotton Fiber; D007854:Lead / Q000032:analysis*; D008516:Medicine, Chinese Traditional; D011166:Porphyrins / Q000737:chemistry*; D012680:Sensitivity and Specificity; D013438:Sulfhydryl Compounds / Q000032:analysis
D011166:Porphyrins; D013438:Sulfhydryl Compounds; D002104:Cadmium; D007854:Lead; C016136:tetraphenylporphine sulfonate; D003300:Copper