Data/hora: 06/06/2024 07:49:21

Provedor de dados: 	Journal of Soil Science and Plant Nutrition	
País: 	Chile	
Título: 	PREDICTION OF BIOAVAILABILITY OF CHLORPYRIFOS RESIDUES IN SOIL TO EARTHWORMS	
Autores: 	Wu,X.M; Yu,Y.L; Li,M; Long,Y.H; Fang,H; Li,S.N.	
Data: 	2011-01-01	
Ano: 	2011	
Palavras-chave: 	Chlorpyrifos; Residue; Soil; Earthworm; Bioavailability; Prediction.	
Resumo: 	An incubation test was conducted to investigate the effect of aging on bioavailability of chlorpyrifos in soil and to assess the feasibility of chemical extraction techniques for predicting bioavailability of chlorpyrifos in soil. Chlorpyrifos was spiked into sterilized soil and aged in microcosms for up to 120 days. The earthworms were incubated in the spiked soils, at 0, 7, 14, 30, 60, and 120 days after spiking, for a period of 7 days. After exposure, chlorpyrifos concentrations in the earthworm tissues were determined. Change in chemical extractability of soil-chlorpyrifos was measured using a several solvent systems including methanol, methanol-water (9:1), acetone-water (5:3), and water. The results show that chemical extractability and earthworm bioavailability of chlorpyrifos in soil decreased with aging. The amount of aged and unaged chlorpyrifos recovered from soil varied with the individual chemical extractant and extraction method. Concentrations of chlorpyrifos in Eisenia foetida were significantly higher than in Allolobophora caliginosa, suggesting that the bioavailability of chlorpyrifos was a species-dependent process. The extractability of chlorpyrifos by chemical solvents was significantly correlated with bioavailability fraction of E. foetida and A. caliginosa, showing that these extraction techniques may be efficient for predicting bioavailability of chlorpyrifos in soil.	
Tipo: 	Journal article	
Idioma: 	Inglês	
Identificador: 	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-95162011000100004	
Editor: 	Chilean Society of Soil Science / Sociedad Chilena de la Ciencia del Suelo	
Formato: 	text/html	
Fonte: 	Journal of soil science and plant nutrition  v.11 n.1 2011