Catalogo Articoli (Spogli Riviste)

OPAC HELP

Titolo:
Abiological loss of endosulfan and related chlorinated organic compounds from aqueous systems in the presence and absence of oxygen
Autore:
Guerin, TF;
Titolo Testata:
ENVIRONMENTAL POLLUTION
fascicolo: 2, volume: 115, anno: 2001,
pagine: 219 - 230
SICI:
0269-7491(2001)115:2<219:ALOEAR>2.0.ZU;2-4
Fonte:
ISI
Lingua:
ENG
Soggetto:
INSECTICIDE CONTAMINATION; JAMAICAN ENVIRONMENT; ALPHA-ENDOSULFAN; BETA-ENDOSULFAN; DEGRADATION; PESTICIDES; MICROORGANISMS; METABOLITES;
Keywords:
endosulfan; degradation; pesticide; half-lives; hydrolysis; non-biological degradation; bi-phasic loss; persistence; abiotic loss; biodegradation; endosulfan sulfate; toxicity; physico-chemical; risk;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
25
Recensione:
Indirizzi per estratti:
Indirizzo: Guerin, TF Shell Engn Ltd, NSW State Off,POB 26, Granville, NSW 2142, Australia Shell Engn Ltd NSW State Off,POB 26 Granville NSW Australia 2142
Citazione:
T.F. Guerin, "Abiological loss of endosulfan and related chlorinated organic compounds from aqueous systems in the presence and absence of oxygen", ENVIR POLLU, 115(2), 2001, pp. 219-230

Abstract

Endosulfan is a cyclodiene organochlorine currently widely used as an insecticide throughout the world. This study reports that the endosulfan isomers can be readily dissipated from aqueous systems at neutral pH in the absence of biological material or chemical catalysts, in the presence or absenceof oxygen. The study showed that aldrin, dieldrin, and endosulfan exhibit bi-phasic loss from water in unsealed and butyl rubber sealed vessels. Half-lives are substantially increased for endosulfan I when oxygen is removed from the incubation vessel. The study conditions, where PTFE was used, weresuch that loss due to volatilization and alkaline chemical hydrolysis was eliminated. Half-lives determined from these data indicate that the parent isomers are much less persistent than the related cyclodienes, aldrin and dieldrin, confirming the findings of previous studies. The major oxidation product of endosulfans I and II, endosulfan sulfate, is less volatile and can persist longer than either of the parent isomers. Endosulfan sulfate was not formed in any of the treatments suggesting that it would not be formed in aerated waters in the absence of microbial activity or strong chemical oxidants. Since endosulfan sulfate is formed in many environments through biological oxidation, and is only slowly degraded (both chemically in sterilemedia and biologically), it represents a predominant residue of technical grade endosulfan, which finds its way into aerobic and anaerobic aquatic environments. The data obtained contributes to and confirms the existing bodyof half-life data on endosulfan I and II and its major oxidation product, endosulfan sulfate. The half-life data generated from the current study canbe used in models for predicting the loss of chlorinated cyclodiene compounds from aqueous systems. The findings also highlight the importance of critically reviewing half-life data, to determine what the predominant processes are that are acting on the compounds under study. (C) 2001 Elsevier Science Ltd. All rights reserved.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 01/10/20 alle ore 01:24:06