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We developed the method for estimating the region-specific predicted paddy pesticide concentrations in river in Tier 2 level (PECTier2) for 29 pesticides. The important region-specific parameters of environmental conditions, which are river flow, paddy rice cropped area, and pesticide usage ratio, were prepared at 350 river flow monitoring sites in Japan. Estimated region-specific PECTier2 suggested that the property of horizontal distribution, effect of each parameter for PEC calculation, and relative position of PECTier2 calculated by standard scenario differed among pesticides. The calculation of region-specific PECTier2 was validated by comparing with measured concentrations in Sakura river (Ibaraki prefecture). Differences between measured and predicted concentrations were within 10-folds for all but one pesticide. This suggests that preparing region-specific parameters (river flow, paddy rice cropped area, and pesticide usage ratio) enable to largely predict realistic environmental concentration for various kind of pesticide use. © Pesticide Science Society of Japan

Analysis of region-specific predicted environmental concentration of paddy pesticides at 350 river flow monitoring sites