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Titolo:
Degradation of endosulfan in a clay soil from cotton farms of western Queensland
Autore:
Ghadiri, H; Rose, CW;
Indirizzi:
Griffith Univ, Fac Environm Sci, Brisbane, Qld 4111, Australia Griffith Univ Brisbane Qld Australia 4111 , Brisbane, Qld 4111, Australia
Titolo Testata:
JOURNAL OF ENVIRONMENTAL MANAGEMENT
fascicolo: 2, volume: 62, anno: 2001,
pagine: 155 - 169
SICI:
0301-4797(200106)62:2<155:DOEIAC>2.0.ZU;2-V
Fonte:
ISI
Lingua:
ENG
Soggetto:
WATER; PERSISTENCE; PESTICIDES; SYSTEMS;
Keywords:
endosulfan pesticide; alpha-endosulfan; beta-endosulfan; persistence; degradation; half-life; attenuation; Thiodan;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
28
Recensione:
Indirizzi per estratti:
Indirizzo: Ghadiri, H Griffith Univ, Fac Environm Sci, Brisbane, Qld 4111, Australia Griffith Univ Brisbane Qld Australia 4111 Qld 4111, Australia
Citazione:
H. Ghadiri e C.W. Rose, "Degradation of endosulfan in a clay soil from cotton farms of western Queensland", J ENVIR MGM, 62(2), 2001, pp. 155-169

Abstract

The persistence and degradation of endosulfan isomers and their primary degradation product, endosulfan-sulfate, were studied in a clay soil from cotton farms of western Queensland. Endosulfan degradation in relation to soilmoisture, temperature, day and night temperature fluctuation, waterloggingand re-application were studied The results show that the degradation rates of both endosulfan isomers were greatly affected by changes in soil watercontent and temperature. Under a high water content-high temperature regime the concentration of alpha -endosulfan in the soil fell rapidly during the first 4 weeks of application, followed by a prolonged period of slower rate of degradation. Alpha endosulfan showed a bi-exponential form of degradation for all water content-temperature experiments except for extremes in both these two factors. In the submerged soils (and also in low-water content, low temperature, non-submerged experiments) no such rapid initial degradation of alpha -endosulfan was observed, and a single first-order rate equation describes the data. Degradation of beta -endosulfan was significantly slower than for the alpha -isomer under all conditions studied. A half-lifeof more than a year was recorded for the beta -isomer when both water content and temperature were low. The degradation of beta -endosulfan showed nosign of the bi-exponential function observed for alpha -isomer, and a single first order rate equation described the data obtained for each factor studied. Endosulfan-sulfate was the major degradation product in all non-submerged experiments. Ifs build up in the soil very closely followed the disappearance of alpha -endosulfan. Its highest build-up was in the high water content-low temperature experiments, but its persistence was primarily influenced by soil temperature. Both alpha and beta -isomers, and endosulfan sulfate, persisted longer in the submerged soil. Re-application of endosulfan,and day and night fluctuation of temperature had contrasting effects on the degradation of the two isomers. Both factors slowed down the degradation of alpha -endosulfan and enhanced that of beta -endosulfan, but their net effect was to prolong the overall persistence of this chemical in the soil. Submerged conditions reduced the net formation of endosulfan-sulfate and enhanced ifs degradation rate. (C) 2001 Academic Press.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 01/10/20 alle ore 00:40:47