No abstract

Pesticides are between the major contaminants that invade aquatic environments. Pesticides monitoring programs were usually conducted using active sampling method in environmental water sites to evaluate the real state of the aquatic media. Polar Organic Chemical Integrative Sampler (POCIS) was recently used for the monitoring of polar pesticides residues in environmental water. The application requires its prior calibration in order to determine the sampling rate "Rs" needed to evaluate the real water concentration of analytes. This paper generates the "Rs" values in water for 24 pesticides never been generated previously. The POCIS laboratory-calibration was performed in glass beakers on the basis of static renewal exposure under stirred conditions for 25 days. The accumulation kinetics of these pesticides was evaluated and the Rs values found varied from 0.0186 to 0.316 L day-1 with RSD˂ 24%. The effect of hydrophobicity on sampling rates (Rs) was also evaluated. Furthermore, we evaluated the applicability of deuterated Atrazine (ATR d5) as Performance Reference Compounds (PRC) to account for between-site variation. High performance liquid chromatography (HPLC) coupled with triple quadrupole tandem mass spectrometry (LC-MS/MS) was used for the analysis.