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山东宁阳国家粮食储备库进行了平房仓散装小麦的磷化氢环流熏蒸试验 ,结果表明 ,粮堆内磷化氢浓度在投药开机 1 8小时后趋于均匀。最低浓度与最高浓度比为 0 .75;2 5小时后 ,比值为 0 .57,均高于国外资料推荐的浓度均匀性标准 ,即大于 0 .2 5。43小时以后的浓度测定结果也高于该值。可见磷化氢环流熏蒸系统对促进磷化氢气体在粮堆内的分布效果良好。熏蒸 1 4天后取得良好的杀虫效果。
The experiment of circulating phosphine in flue-cured tobacco in bulk warehouse in Nanjing Ningyang National Grain Reserve carried out the fumigation experiment. The results showed that the phosphine concentration in the grain piles tended to be uniform after 18 hours of starting-up. The lowest concentration to the highest concentration ratio was 0.75; after 25 hours, the ratio was 0.57, which was higher than the standard of concentration uniformity recommended by foreign data, ie, greater than 0.2. The concentration measurement results after 5.43 hours were also high At this value. Shows that phosphine circulating fumigation system to promote the distribution of phosphine gas in the grain within the good effect. Fumigation 14 days after a good insecticidal effect.