A study was undertaken for the evaluation of the pesticide pollution caused by the agricultural activities in the
basin of Lake Vistonis, Greece during the years 2010–2012. Water samples were collected from Lake Vistonis,
four major rivers and various small streams and agriculture drainage canals. The concentration of 302
compounds was determined after solid-phase extraction of the water samples and subsequent LC-MS/MS and
GC-MS/MS analysis of the extracts. Overall, herbicides were the most frequently detected pesticides (57%),
followed by insecticides (28%) and fungicides (14%). In Lake Vistonis 11 pesticides were detected. Specifically,
fluometuron was detected in the 75% of the samples (maximum concentration 0.088 μg/L) whereas lambda–
cyhalothrin was detected in all the samples of spring 2011 and alphamethrin in all the samples of spring 2012
(maximum concentration 0.041 and 0.168 μg/L, respectively). In the rivers and drainage canals 68 pesticides
were detected. Specifically, fluometuron was detected in the 53% of the samples (maximum concentration
317.6 μg/L) followed by chlorpyrifos and prometryn (16 and 13% of the samples respectively). An environmental
risk assessment was performed by employing the Risk Quotient (RQ) method. The risk assessment revealed that
at least one pesticide concentration led to a RQ N 1 in 20% of the samples. In Lake Vistonis, alphamethrin and
lambda–cyhalothrin concentrations resulted in RQ N 1, whereas in the other water bodies this was mainly the
A study was undertaken for the evaluation of the pesticide pollution caused by the agricultural activities in thebasin of Lake Vistonis, Greece during the years 2010–2012. Water samples were collected from Lake Vistonis,four major rivers and various small streams and agriculture drainage canals. The concentration of 302compounds was determined after solid-phase extraction of the water samples and subsequent LC-MS/MS andGC-MS/MS analysis of the extracts. Overall, herbicides were the most frequently detected pesticides (57%),followed by insecticides (28%) and fungicides (14%). In Lake Vistonis 11 pesticides were detected. Specifically,fluometuron was detected in the 75% of the samples (maximum concentration 0.088 μg/L) whereas lambda–cyhalothrin was detected in all the samples of spring 2011 and alphamethrin in all the samples of spring 2012(maximum concentration 0.041 and 0.168 μg/L, respectively). In the rivers and drainage canals 68 pesticideswere detected. Specifically, fluometuron was detected in the 53% of the samples (maximum concentration317.6 μg/L) followed by chlorpyrifos and prometryn (16 and 13% of the samples respectively). An environmentalrisk assessment was performed by employing the Risk Quotient (RQ) method. The risk assessment revealed thatat least one pesticide concentration led to a RQ N 1 in 20% of the samples. In Lake Vistonis, alphamethrin andlambda–cyhalothrin concentrations resulted in RQ N 1, whereas in the other water bodies this was mainly the
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