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Titolo:
Pesticide storage and release in unsaturated soil in Illinois, USA
Autore:
Roy, WR; Krapac, IG; Chou, SFJ; Simmons, FW;
Indirizzi:
Illinois State Geol Survey, Champaign, IL 61820 USA Illinois State Geol Survey Champaign IL USA 61820 Champaign, IL 61820 USA Univ Illinois, Dept Nat Resources & Environm Sci, Urbana, IL 61801 USA Univ Illinois Urbana IL USA 61801 es & Environm Sci, Urbana, IL 61801 USA
Titolo Testata:
JOURNAL OF ENVIRONMENTAL SCIENCE AND HEALTH PART B-PESTICIDES FOOD CONTAMINANTS AND AGRICULTURAL WASTES
fascicolo: 3, volume: 36, anno: 2001,
pagine: 245 - 260
SICI:
0360-1234(2001)36:3<245:PSARIU>2.0.ZU;2-F
Fonte:
ISI
Lingua:
ENG
Soggetto:
ATRAZINE DEGRADATION; CHLORPYRIFOS; PERSISTENCE; NITRATE; IMMUNOASSAY; DISSIPATION; SEDIMENTS; NITROGEN; MOBILITY; ALACHLOR;
Keywords:
nonpoint pollution; dissipation; atrazine; chlorpyrifos;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
29
Recensione:
Indirizzi per estratti:
Indirizzo: Roy, WR Illinois State Geol Survey, 615 E Peabody Dr, Champaign, IL 61820 USA Illinois State Geol Survey 615 E Peabody Dr Champaign IL USA 61820
Citazione:
W.R. Roy et al., "Pesticide storage and release in unsaturated soil in Illinois, USA", J ENVIR S B, 36(3), 2001, pp. 245-260

Abstract

The chemical fate and movement of pesticides may be subject to transient storage in unsaturated soils during periods of light rainfall, and subsequent release into shallow groundwater by increased rainfall. The objective of this study was to conduct field-scale experiments to determine the relativeimportance of transient storage and subsequent release of agrichemicals from the vadose zone into potential aquifers. Two field-scale experiments were conducted under a rain exclusion shelter. In the 1(x) experiment, atrazine and chlorpyrifos were applied at application-rate equivalents (1.6 kg ha(-1) and 1.3 kg ha(-1), respectively). In the 4(x) experiment, atrazine was applied in an amount that was four times greater than that usually applied to fields (6.7 kg ha(-1)). Water was either applied to simulate rain or withheld to simulate dry periods. In the 1(x) experiment, atrazine was detected in the water samples whereas chlorpyrifos was not detected in the majority of the samples. The dry period imposed on the treatment plot did not appear to result in storage of the chemicals, whereas the wet period resulted in greater leaching of atrazine, although the concentrations remained less than the Maximum Contaminant Level of 3 mug L-1. Both chemicals were detected in soil samples collected from a 20- to 30-cm depth, but it appeared thatboth chemicals dissipated before the field experiment was concluded. It appeared that the one-time application of atrazine and chlorpyrifos at the label rates did not result in a sufficient mass to be stored and flushed in significant concentrations to the saturated zone. When atrazine was applied at 4(x) and a longer drought period was imposed on the treatment plot, the resulting concentrations of dissolved atrazine were still less than 3 mug L-1. Atrazine was detected in only the near-surface (0 to 15 cm) soil samples and the hc herbicide dissipated before the onset of the dry period in thetreatment plot. The results of this field study demonstrated that atrazineand chlorpyrifos wore not sufficiently persistent to be stored and then released in significantly large concentrations to the saturated zone. The dissipation half-life of atrazine in the 4(x) application was about 44 days. This study, in addition to others, suggested that atrazine may be less persistent in surface soil than has been generally reported.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 27/09/20 alle ore 11:28:44