UNASSIGNED: Methodology using solid phase extraction and high performance liquid chromatography (SPE-C18/HPLC-DAD) was applied to pesticide determinations in ten water reservoirs in the semidarid region of northeastern Brazil.  The validated method was suitable for determination of herbicides and insecticide in surface water. The recovery efficiency of @entity12472 , @entity35882 and @entity14458 was approximately 70  %. The method also showed good linearity and selectivity with correlation coefficients (R) greater than 0.99. The limits of detection were below the maximum residue limits (MRLs) established by government agencies. Studied reservoirs showed presence of @entity12472 at mean levels from 7.0 to 15.0    g/L. @entity14458 and @entity35882 were not detected during the period. The @entity12472 levels measured from this semiarid region are of the same magnitude as those found in regions with moderate to high agricultural activity. According to detected @entity12472 concentrations, the annual health risk to @entity1 was insignificant. However, the control of herbicides is important to maintain the quality of water in the reservoirs of @entity16872  , Brazil.

Estimated Levels of Environmental Contamination and Health Risk Assessment for Herbicides and Insecticides in Surface Water of XXXX  , Brazil.

@entity1 :: ('9606', 'Species') :: ['humans'] @entity16872 :: ('4670', 'Gene') :: ['Cear'] @entity12472 :: ('MESH:D001280', 'Chemical') :: ['atrazine'] @entity14458 :: ('MESH:D012839', 'Chemical') :: ['Simazine', 'simazine'] @entity35882 :: ('MESH:D008743', 'Chemical') :: ['methyl parathion', 'methyl-parathion']
@entity16872 :: (4670,Gene) :: ['Cear']
