Journal
JOURNAL OF CHROMATOGRAPHY A
Volume 889, Issue 1-2, Pages 261-269Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/S0021-9673(00)00425-8
Keywords
water analysis; environmental analysis; pesticides; chlorothalonil; dichlofluanid; Sea-Nine 211; Irgarols; thiocyanomethylthiobenzothiazole
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A simple multiresidue method has been developed for the determination of five pesticides, commonly used as active ingredients in antifouling paints, in seawater samples. The pesticides studied were: chlorothalonil (2,4,5,6-tetrachloro-isophthalonitrile), dichlofluanid (N-dimethyl-N-phenylsulphamide), Sea-Nine 211 (4,5-dichloro-2-n-octyl-4-isothazolin-3one), Irgarol 1051 (2-methylthio-4-tert.-butylamino-6-cyclopropylamino-s-triazine) and TCMTB (2-thiocyanomethylthiobenzothiazole). The analytes were extracted from 200 ml water samples, using solid-phase extraction. A copolymer with hydrophilic-lipophilic balance was used as sorbent yielding good recoveries (82-95%) for most compounds except dichlofluanid and Sea-Nine 211 (<60%). Large volume injection (10 mu l) gas chromatography and electron impact ionization MS (selected ion monitoring mode) detection enabled these compounds to be identified and quantified at the 1.2-3.0 ng/l level. Analysis of samples performed in three marinas in Almeria (Spain) revealed the presence of Irgarol 1051 in all the cases, at concentration levels between 25 and 450 ng/l. (C) 2000 Elsevier Science B.V. All rights reserved.
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