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  • Title: Decrease of 4,5,6,7-tetrachlorophthalide in paddy field soil after aerial application.
    Author: Iwashita M, Maeda T, Hori T, Asada T, Oikawa K, Kawata K.
    Journal: Bull Environ Contam Toxicol; 2008 Oct; 81(4):383-6. PubMed ID: 18670728.
    Abstract:
    Variation in the fungicide, 4,5,6,7-tetrachlorophthalide (phthalide), in paddy field soil was investigated in order to evaluate its decrease after aerial application by a radio-controlled helicopter. The maximum concentrations of phthalide were 309-320 microg/kg dry, which were 83%-96% of the applied phthalide. The organic carbon normalized soil sorption coefficient (K(oc)) was calculated to be 94-96 mL/g at 1 h after the application. The calculated K(oc) values increased to 620-1,300 mL/g from 1 through 9 days after the application and then 4,700-7,200 mL/g 14 days after the application. The half-life of the phthalide was calculated to be 20-31 days.
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