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首页> 外文期刊>Journal of environmental science and health >Comparison Of Surface Emissions And Subsurface Distribution Of Cis- And Trans-1,3-dichloropropne And Chloropicrin In Sandy Field Beds Covered With Four Different Plastic Films
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Comparison Of Surface Emissions And Subsurface Distribution Of Cis- And Trans-1,3-dichloropropne And Chloropicrin In Sandy Field Beds Covered With Four Different Plastic Films

机译：四种不同塑料膜覆盖的沙地床中顺式和反式1,3-二氯丙烯和氯霉素的表面发射和地下分布的比较

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The purpose of this study was to conduct a field study at a Florida field site on surface emissions and subsurface distribution of cis-and trans-1,3-dichloropropene (1,3-D) and chloropicrin (CP) in raised beds injected with Telone C35 with four replications. A total of 16 beds were applied with Telone C35 by chisel injection and covered with four different plastic films, 4 beds for each film. Each bed was installed with five 20-cm long soil pore air probes and a surface air collection pan at arbitrarily locations along the length of each bed for sampling soil pore air and surface air, respectively, for analysis of the three biologically active compounds, cis- and trans-1,3-D and CP. We found that average concentrations of the three compounds at 20-cm depth among the beds covered with four different plastic films generally were not statistically different. Among the four beds covered with the same plastic film, average concentrations of the three compounds were statistically different only in the four metallic PE covered beds at 5 and 24 hours after injection. Volatilization rates of the three compounds among the beds covered with four different plastic films, with the exception of CP at 48 hours after injection, were not statistically different. It appeared that initial upward diffusion and volatilization flux were influenced by solar radiation. Initial subsurface concentrations of the three compounds and volatilization flux, especially cis-1,3-D, were greater in the beds on the east side of the field than that in the beds on the west side of the field. Whether or not difference in initial subsurface concentrations of the compounds between east side beds and west side beds may influence fumigant efficacy remains to be determined.
机译：这项研究的目的是在佛罗里达州的一个现场进行田间研究，研究在注入了高岭土的高床中，顺式和反式-1,3-二氯丙烯（1,3-D）和氯仿（CP）的表面排放和地下分布Telone C35具有四个副本。通过凿子注射总共用Telone C35施加了16个床，并覆盖了四个不同的塑料薄膜，每个薄膜有4个床。每张床在每张床的长度上任意位置安装了五个20-cm长的土壤孔隙空气探头和一个地面空气收集盘，分别用于采样土壤孔隙空气和地面空气，以分析三种生物活性化合物顺式-以及trans-1,3-D和CP。我们发现，在覆盖有四种不同塑料薄膜的床层中，三种化合物在20厘米深度处的平均浓度通常没有统计学差异。在覆盖有相同塑料薄膜的四张床中，三种化合物的平均浓度仅在注射后5小时和24小时在四张金属PE覆盖床中具有统计学差异。三种化合物在覆盖有四种不同塑料薄膜的床中的挥发速率（注射后48小时的CP除外）没有统计学差异。似乎最初的向上扩散和挥发通量受到太阳辐射的影响。三种化合物的初始地下浓度和挥发通量，特别是顺式1,3-D，在田野东侧的层中比在田野西侧的层中大。东侧床和西侧床之间化合物初始地下浓度的差异是否会影响熏蒸效力，还有待确定。

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