Estimation of leaching distance of pesticides in leachate on column leaching study
2010
Watanabe, T., Food and Agricultural Materials Inspection Center, Tokyo (Japan) | Iwafune, T. | Yamashita, Y.
The OECD test guideline 312 recommends to measure a leaching distance of a test substance in the column leaching experiment and to calculate the relative mobility factor (RMF) using a reference substance, in order to evaluate its potential for movement into groundwater, While the leaching distance is generally calculated based on the distribution of test substance in the segments in a soil column, the leaching distance cannot be measured when the substance is eluted in leachate. In this study, a method to estimate the leaching distance of the compounds that flow out of the soil column under the guideline-recommended conditions was proposed, in which the elution volume was converted into the distance, by assuming that a fraction of leachate water with a weight of the water content in the 5 cm soil layer in the column corresponds to the soil segment of the same length.
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