土壤中单甲脒挥发的研究-环境科学学报.PDF

19 2 Vol. 19, No. 2 1999 3 ACTA SCIENT IAE CIRCUMSTANT IAE Mar. , 1999 * * * * * * 张晓辉 莫汉宏 杨克武 安凤春 ( , 100085) . , ; ; , ; , . ; ; ; ; . Volatilization of N ( 2, 4dimethylphenyl) N methylformamidine from soil ZHANG Xiaohui, MO Hanhong, YANG Kewu, AN engchun ( Research Center for EcoEnvironmental Sci ences, Chines Academy of Sciences, Beijing 100085) Abstract The volatilization of N ( 2, 4dimethylphenyl) N methyl_formamidine ( DMA) from the surface of DMA pure substance and soil were initially measured in laboratory. The result shown that at the air flow of 3. 33m/ min, the vapor flux of DMA from the surface of pure DMA w as 2. 59, 6. 67 and 2 18. 13 mg/ ( m !h) , at 30, 35 and 40 ∀ , respectively. There was a linear relationship between the recip rocal of the temperature and the logarithm of the value for DMA vapor flux from the surface of DMA pure substance. actors influencing the volatilization of DMA from soil were also investigated. Under the same condition, the volatilization of DMA from soil with low organic matter was generally greater than that from soil with high organic matter. In a limited extent, the vapor flux of DMA increased w ith the in crease of DMA concentration in soils, the temperature or the air flow rate. The increase of water content in soil was able to raise the DMA volatilization at first, however, more water probably reduce the volatilization of DMA. Without water evaporation from soil at 25 ∀ , total amount of DMA vaporized from sand loam soil during the first four days was measured as 0. 28mg, which is 5. 6% of all used pesti cide. Keywords N ( 2, 4 dimethylphenyl) N methylformidine, pesticide, soil, volatiolization. , . , . ( ) * ( * * : * * * 2 :