How the effect of bound residue due to soil ageing is considered during setting of MRL of Pesticides? As the Bound residue formation is not the final end point of pesticide. The BRs may be desorbed/remobilized by root exudates/microbes.
The BRs are very strange as these can release the residues at their own whims and fancy. Therefore, sometime it has been observed that certain phenomena in soil suddenly decrease or increase due to this and hence these are very important parameter for setting MRL of pesticides.
Thank you Mr. Ghosh for your opinion. I wonder that how the BR can be considered? As many researcher setting MRL based on OECD/EPA guidelines without counting BRs as an interfering issues.
As you may know, the MRL is set as the upper 95th%tile of measured residues in the portion of the plant that is actually eaten. The residue results are from a large set of studies that are designed to measure the residues across the range of environmental conditions that are expected to occur. Therefore, if there was a release of soil-bound residues that affected the amount of residues in the portion of the plant that is actually eaten, then those measured residues would be part of the MRL calculation. Note also that the MRL is not a statement about the safety of the exposure, it is a measure of the legally acceptable residues at the point of food consumption.
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