Biodegradation of chlorpyrifos in two soils of the VI region of Chile, using isotopic techniques.
2009; Pavia University Press; Volume: 53; Issue: 1 Linguagem: Inglês
ISSN
2283-5431
AutoresD. Potenza, O. Moll, Adriana Nario, Walter Luzio, Inés Pino, A. M. Parada,
Tópico(s)Pesticide Residue Analysis and Safety
ResumoAfter the application of a pesticide, only a part of it has an effect on the target, while other part of the pesticide circulates in different environments turning into an environmental risk. In Chile, one of the pesticides widely used is chlorpyrifos (CLP), where the highest percentage is traded at the VI Region. The objective of this study was to quantify the biodegradation of CLP in two Soil Series (Fluventic Haploxerolls) from the VI Region, using a labeled chlorpyrifos with 14 Carbon ( 14 C-CLP) in the molecular structure. The biodegradation of CLP was measured for a soil incubation period of 69 days for the Serie O'Higgins (S 1 ), and 57 days for Serie Rancagua (S 2 ). Every three days the 14 Co 2 produced was quantified, also the total 14 C-CLP bound and extractable residues in the soil were measured during the process. The results showed that 50 % of the biodegradation was attained after 40 days of incubation for S 1 , and 24 days in S 2 , while at the end of the total period 59.5 % and 61.3 % of pesticide were biodegraded for S 1 and S 2 , respectively. As an approach the GUS index was assessed assuming the 50 % of the CLP biodegradation as the CLP half life, representing a value of 1.38 for S 1 and 0.79 for S 2 . These indexes indicate CLP as a non leachable product and a low potential risk of groundwater contamination.
Referência(s)