Kinetics of atrazine hydrolysis in water

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Abstract
This study determined the kinetics of decomposition of atrazine in well water and deionized water refrigerated (4°C) and at slightly above room temperature (30°C.) When water samples containing normal groundwater pHs and dissolved organic carbon levels were brought to a known concentration of atrazine (400 nmol L‐1) and stored 19 weeks, no significant loss in atrazine concentration occurred. First‐order rate constants ranged from ‐2.4 × 10‐3 to ‐3.7 × 10‐3 weeks‐1. These results indicate that those quality assurance/quality control protocols that require holding times of less than 48 hours in the laboratory prior to extraction should be updated to allow flexibility dependent on the pesticide provided that the appropriate controls and documentation are in place.

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