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本文报告了采用小布袋埋藏法、探管投药法和磷化氢发生器仓外施药法点 (局部 )施药后磷化氢在散装粮堆中的运动分布情况。结果表明 ,在试验仓中三种方式施药后磷化氢的主要运动方向为施药点下方 ,向四周扩散比较少 ,在施药点上方几乎检测不到磷化氢气体。小布袋埋藏施药后基本在 1～ 2d后施药点可测到浓度 ,磷化氢在施药点 (主要在下方 )滞留的时间约 3～ 6d ;探管施药时磷化氢在主要分布的施药点下方 ,在第 8～ 10d后检测不出磷化氢 ,但总体浓度水平较低 ;用钢瓶装二氧化碳气体与发生器混合施入气体时 ,在施药点下方 2h后即可检测到较高浓度 ,但 1d后在施药点 4m的范围内即基本检测不到磷化氢。
This paper reports on the distribution of phosphine in bulk grain piles using the method of burying small sacks, probe dosing and the site-specific (partial) application of a phosphine generator. The results showed that the main movement directions of phosphine in the three modes of application in the test chamber were below the application point and less diffusion to the periphery, and almost no phosphine gas was detected above the application point. Small bag buried after the application of the basic 1 ~ 2d after the application point can be measured at the concentration of phosphine in the application point (mainly in the bottom) of the retention time of about 3 ~ 6d; Phosphine in the probe when the main application Distribution of drug points below the first 8 ~ 10d after the test did not detect phosphine, but the overall level of the lower; with carbon dioxide gas cylinder and generator mixed into the gas, after the application point below 2h Higher concentrations were detected, but no phosphine was detected substantially within 4 m of the application point after 1 day.