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Automated liquid membrane extraction and trace enrichment of triazine herbicides and their metabolites in environmental and biological samples
Author(s) -
Megersa Negussie,
Chimuka Luke,
Solomon Theodros,
Jönsson Jan Åke
Publication year - 2001
Publication title -
journal of separation science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.72
H-Index - 102
eISSN - 1615-9314
pISSN - 1615-9306
DOI - 10.1002/1615-9314(20010801)24:7<567::aid-jssc567>3.0.co;2-b
Subject(s) - chemistry , analyte , chromatography , membrane , triazine , extraction (chemistry) , salting out , solid phase extraction , sample preparation , solvent , atrazine , organic chemistry , aqueous solution , pesticide , biochemistry , agronomy , biology
Abstract A selective liquid membrane extraction technique has been developed for enrichment of the s ‐Triazine herbicides and their common degradation products. The uncharged analyte molecules entering the donor channel diffuse through an organic solvent immobilized in a porous hydrophobic membrane. In the acceptor phase, a chemical ionization is facilitated so the diffused analyte molecules are irreversibly trapped, and thereby concentrated. The effect of addition of carrier molecules in the membrane liquid has been investigated, and trioctyl phosphine oxide (TOPO) was found to be the best. The analyte salting out effect was also studied by varying the concentration of sodium chloride in the extraction sample solution. The selectivity of the extraction methodology in surface water and urine samples has demonstrated the potential applications of the technique for enrichment of s ‐triazine herbicides and their metabolites in samples containing complex matrices.