Comparison of soil sorption parameters of pesticides measured by batch and centrifugation methods using an andosol

We compared the soil sorption coefficient (K _d) measured by batch and centrifugation methods using a Japanese andosol and ten pesticides. Although the K _d values measured by both methods increased with time, those obtained via the batch method tended to be higher during the test period. The difference in K _d values between the two methods affected pesticide concentrations estimated in the soil solution, and the results estimated using K _d values obtained via the batch method underestimated the observed trends.