【摘要】 储粮害虫防治使用磷化铝熏蒸,在密闭和通风期间,对粮仓内外空间和粮堆的PH₃气体浓度变化规律及其分布情况,进行了测试研究。结果表明, PH₃ 在粮仓内的分布和浓度变化,在熏蒸放气后相当长一段时间内仍超过卫生标准。在常规熏蒸和“双低”熏蒸时,仓内PH₃浓度在26天和41天内均超标。仓外四周PH₃浓度在熏蒸密闭期间,距仓10米以内和通风放气期间距仓20米以内,在一定时间也有超标现象。更多还原

【Abstract】 A determination and study has been made on the changes of PH concentration and its distribution in the atmosphere inside and outside the storehouse when the storehouse where PH is used to fumigate stored grain pests are tightly closed and ventilated. The results show that the distribution and concentration of PH inside the storehouse still exceeds the normal health standard, when the storehouse is opened after fumigating. Within 26 and 41 days after normal fumigating or fumigating with low dosage of PH and in atmosphare of less oxygen.The PH concentration inside the storehouse exceeds the health standard.The PH concentration outside the storehouse within 10m from the storehouse goes beyond the standard when the storehouse is closed for fumigatihg, so does that within 20m from the storehouse during a period after the storehouse is opened for ventilation.更多还原