磷化氢缓释熏蒸中的气体分布均匀性与实仓熏蒸有效性的研究

Study on Gas Distribution Uniformity of phosphine in Controlled Release Fumigation and the Efficiency of Full Storage Fumigation

本文研究了缓释熏蒸中PH_3气体在玉米、小麦堆垛内的升降规律和分布均匀性、仓房气密性的检验标准。结果表明:PH_3以低浓度开始逐渐上升至最高值,尔后缓慢下降向四下扩散逐步均匀;昆虫在PH_3有效气体中暴露36-45天能彻底杀虫;全仓PH_3平均最低浓度在暴露期结束时,大于最低控虫浓度(0.01mg/l),可适用于检验仓房良好的气密性;暴露期的1/4时间内,PH_3最低最高浓度比值大于0.25,且以后时间大于该值,能有效地检验PH_3分布的均匀性。

The paper makes a study on increase and decrease regularity and distribution uniformity of phosphine slowly released for fumigation in corn and wheat stacks. The results show that the concentration of pH_3 gradually increases to the maximum value, then slowly decreases and the gas diffuses in all directions and reaches uniform distribution. pests, exposed in effective phosphine for 36-45 days, can be killed wholly the mean of minimum concentration of pH_3 in the whole storehouse after exposure period is greater than the minimum controlled concentration ( 0.0lmg/ 1 ) . This concentration can be used for verifying the air tight of storage. During first quater of exposure period the ratio minimum to maximum concentration of phosphine is greater than 0.25, and during later parts of the exposure period it is still greater that the value, which can effectively verify the distribution uniformity of pH_3.