Pesticides were evaluated during 12 sampling campaigns, performed
from February 2011 to November 2012 (in the months of February,
April, June, July, September and November; for both years). The
rainy season included the months of November, February and April,
and the dry season included the months of June, July and September;
these periods were defined by the Portuguese Environment Agency
(APA) for the Alentejo region (ARHAlentejo, 2011). During the study
period, a total of 60 water samples (1 L) were collected at a depth of
50 cm, transported to the laboratory at 4 °C, and stored in amber PET
bottles in the dark at −18 °C until analysis. This sampling followed
the same temporal and spatial scheme used in the previous studies in
order to make the results as much comparable as possible, always taking
into account the uncertainty introduced by varying conditions, such as rainfall, temperature, and/or pesticide application, on the results
obtained.
Pesticides were evaluated during 12 sampling campaigns, performed
from February 2011 to November 2012 (in the months of February,
April, June, July, September and November; for both years). The
rainy season included the months of November, February and April,
and the dry season included the months of June, July and September;
these periods were defined by the Portuguese Environment Agency
(APA) for the Alentejo region (ARHAlentejo, 2011). During the study
period, a total of 60 water samples (1 L) were collected at a depth of
50 cm, transported to the laboratory at 4 °C, and stored in amber PET
bottles in the dark at −18 °C until analysis. This sampling followed
the same temporal and spatial scheme used in the previous studies in
order to make the results as much comparable as possible, always taking
into account the uncertainty introduced by varying conditions, such as rainfall, temperature, and/or pesticide application, on the results
obtained.
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