SPECTROPHOTOMETRIC DETERMINATION OF LEAD BY EXTRACTION OF THE MIXED-METAL COMPLEX PB(II)-CA-PURPURIN (1,2,4-TRIHYDROXYANTHRAQUINONE)

Authors
RAMIREZ AA GAZQUEZ D DELAROSA IM MORENO F
Citation
Aa. Ramirez et al., SPECTROPHOTOMETRIC DETERMINATION OF LEAD BY EXTRACTION OF THE MIXED-METAL COMPLEX PB(II)-CA-PURPURIN (1,2,4-TRIHYDROXYANTHRAQUINONE), Analytical letters, 27(8), 1994, pp. 1595-1611
Citations number
18
Categorie Soggetti
Chemistry Analytical
Journal title
Analytical letters → ACNP
ISSN journal
00032719
Volume
27
Issue
8
Year of publication
1994
Pages
1595 - 1611
Database
ISI
SICI code
0003-2719(1994)27:8<1595:SDOLBE>2.0.ZU;2-5
Abstract
Mixtures of Lead(II) and Ca(II) form with purpurin (P; 1, 2, 4-Trihydr oxyanthraquinone) the mixed-metal-complex PbCaP3, which is extracted w ith isobutyl methyl ketone (IBMK) at pH 7.8. The molar absorptivity of the complex is 2.8 x 10(4) l.mol(-1).cm(-1) at 575 nm and its conditi onal extraction constant: 2.5 x 10(17) l(4).mole(4). The use of this c omplex for the spectrophotometric determination of lead up to 40 mu g has been investigated. The proposed procedure has been successfully ap plied to the analysis of this metal in different samples.