1. EPA No 507 (Method I), The American Environment Protection Agency, USA.
2. 76/646/EEC council directive on pollution.
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4. G. Durand, R. Forteza, D. Barcelo, Chromatographia28, 597 (1989).
5. M. C. Hennion, P. Scribe, in “Environmental Analysis”, D. Barcelo, Ed., Elsevier, Amsterdam, 1993, p. 23.