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E-Journal of Chemistry
Volume 8 (2011), Issue 3, Pages 1114-1119

Supercritical Fluid Extraction of Metals Using Bis(2,4,4-trimethyl-pentyl)monothiophosphinic Acid as Chelating Agent for Subsequent ICP-MS Analyses of Mercury, Cadmium and Lead in Sediment

E. C. Roa,1,2 M. Schultz,3 and M. B. Capangpangan1

1Deparment of Chemistry, College of Science and Mathematics, Mindanao State University-Iligan, Institute of Technology (MSU-IIT), 9200 Iligan City, Philippines
2Institute of Fisheries Research and Development, Mindanao State University-Naawan, 9023 Naawan, Misamis Oriental, Philippines
3School of Physical and Chemical Sciences, Queensland University of Technology, Brisbane, Queensland 4001, Australia

Received 19 November 2010; Accepted 21 January 2011

Copyright © 2011 Hindawi Publishing Corporation. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


This study investigated and validated the optimum conditions for a supercritical fluid extraction (SFE) method using bis(2,4,4-trimethylpentyl)-monothiophosphinic acid as a chelating ligand, for subsequent ICP-MS analyses of mercury, cadmium and lead in sediment. Several combinations of pressure, temperature and modifier (P-T-M) conditions for SFE were tested and an appropriate collection solvent was also determined using a sediment certified reference material (CRM) as sample, to determine the optimum set of conditions. Validation results of the optimized method indicated high percent recoveries which are better compared to standard methods.