土壌中の残留農薬の調査における試料採取誤差

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タイトル別名
  • Variation of Concentrations of Pesticide Residues in Field Soil
  • Study on Soil-Persistency Test of Pesticide (Part 3)

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The variation of concentrations of pesticide residues in soil samples collected from farms was investigated. Four increments (500g) of soil were collected from a strawberry garden 0 and 1 day after spraying DDVP emulsion, and their DDVP concentrations were determined individually. Twenty increments were taken from a spinach garden 0 and 7 days after spraying diazinon emulsion. Four increments were used for determination of diazinon contents individually. The remaining were mixed by four increments and resulting 4 samples were analysed. Fifteen increments of soil were collected from a paddy field of rice 0 to 7 days after application of diazinon granule. The increments were divided to 3 increment samples and 3 mixed samples by treating as mentioned above, and diazinon concentration in each sample was determined. The results are summarized in Table 1. The average of the coefficients of variation (CV) of the increment analysis and that of the analysis of mixed samples were 52% and 26%, respectively. In the soil-persistency test, the half life (HL) of a chemical in soil is calculated from the slope of the regression line (A) of logarithms of the chemical concentrations (Y) and intervals (X) after application of the chemical. If HL of a chemical and CV are 12 months and 25% respectively and samples are collected 0, 4, 8 and 12 months after the application, the standard deviation (s) of Y and the error of A are calculated as 0.11 and 0.012, respectively, and the confidence limit of HL is estimated as 3.9 months-∞. If X are 0, 3, 6, 9, 12 and 15, the error of A and the confidence limit of HL are estimated as 0.0087 and 6.1 months-25 years, respectively. To reduce the confidence limit of the estimated HL, not only CV should be decreased but the number of X should be increased.

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