Application of supercritical fluids to the reactive extraction and analysis of toxic heavy metals from environmental matrices-system optimisation

Authors
Elshani, S Smart, NG Lin, YH Wai, CM
Citation
S. Elshani et al., Application of supercritical fluids to the reactive extraction and analysis of toxic heavy metals from environmental matrices-system optimisation, SEP SCI TEC, 36(5-6), 2001, pp. 1197-1210
Citations number
24
Categorie Soggetti
Chemistry
Journal title
SEPARATION SCIENCE AND TECHNOLOGY
ISSN journal
01496395 → ACNP
Volume
36
Issue
5-6
Year of publication
2001
Pages
1197 - 1210
Database
ISI
SICI code
0149-6395(2001)36:5-6<1197:AOSFTT>2.0.ZU;2-3
Abstract
The extraction Of Cu2+, Pb2+, Cd2+ and Zn2+ utilising supercritical fluid c arbon dioxide containing dissolved organophosphorus reagents is shown to be feasible. Using the solubility parameter concept and investigation of a va riety of physical parameters favourable extraction conditions of 60 degrees C and 400 atm pressure were determined. Cyanex 302 was found to be the most favourable ligand in terms of stability and ability to complex a range of metal ions. A soil containing substantial amounts of Pb2+ and Cd2+ was stud ied using SFE and the technique was found to reduce the levels of leachable metal ions to near US EPA regulatory levels.