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Chlorpyrifos contamination of fresh water in a commercial vegetable cultivation area in Sri Lanka and factors affecting contamination

Authors:

A.M.W. Menike ,

Department of Chemical and Process Engineering, Faculty of Engineering, University of Peradeniya, Peradeniya., LK
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R. Shanthini,

Department of Chemical and Process Engineering, Faculty of Engineering, University of Peradeniya, Peradeniya., LK
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C.S. Kalpage,

Department of Chemical and Process Engineering, Faculty of Engineering, University of Peradeniya, Peradeniya., LK
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D.G.G.P. Karunaratne,

Department of Chemical and Process Engineering, Faculty of Engineering, University of Peradeniya, Peradeniya., LK
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Anuruddha Kankanamge

Department of Economics and Statistics, Faculty of Arts, University of Peradeniya, Peradeniya., LK
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Abstract

The study investigated the interrelationships among chlorpyrifos (CPF) concentrations in water resources, CPF application and rainfall during peak pesticide application period with usual rainfall pattern. Water samples were collected at three day intervals from groundwater and surface water resources at Marassana, a commercial vegetable cultivation area in the Kandy District, Sri Lanka, during a 5-month period. CPF application and rainfall data were also collected simultaneously. High performance liquid chromatography analyses revealed that the average CPF concentration in groundwater and surface water samples were 0.63 and 0.52 μg/L, respectively. The respective corresponding maximum values were 7.1 and 3.7 μg/L. Multiple linear regression analysis of the data established that 1 L of CPF 40 % (= 400 g/L concentration) applied in the catchments increased the CPF concentration in the groundwater and surface water by 0.65 μg/L and 0.120 μg/L, respectively; 1 mm of cumulative rainfall received increased the CPF concentration of surface water by 0.021 μg/L but did not affect the groundwater concentration significantly. Uncertainties in the model parameters analysed using Monte Carlo stochastic simulation established that there was an 88 % probability for the CPF concentration to remain positive in the surface water.

Doi: http://dx.doi.org/10.4038/jnsfsr.v40i4.5047

J.Natn.Sci.Foundation Sri Lanka 2012 40 (4): 333-344

How to Cite: Menike, A.M.W., Shanthini, R., Kalpage, C.S., Karunaratne, D.G.G.P. and Kankanamge, A., 2012. Chlorpyrifos contamination of fresh water in a commercial vegetable cultivation area in Sri Lanka and factors affecting contamination. Journal of the National Science Foundation of Sri Lanka, 40(4), pp.333–344. DOI: http://doi.org/10.4038/jnsfsr.v40i4.5047
Published on 19 Dec 2012.
Peer Reviewed

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