众所周知,磷化氢是目前和以后一定时期内防治储藏物害虫的主要熏蒸剂,因其分子量小,钻透性好,可及时熏蒸一定深度内的储粮害虫。从理论上讲,磷化氢的钻透深度达3m左右。实际上,随着粮食堆装的升高,人力进仓和保管方式的影响,粮堆板结程度不断加大,阻碍了毒气的钻透,远达不到理论熏杀要求。我县曾针对常规熏蒸药剂钻透深度进行浓度测定,发现2m以下已测不出药剂浓 It is well-known that phosphine is the main fumigant for controlling pests in storage for a certain period at present and in the future. Due to its small molecular weight and good drilling ability, phosphine can fumigate stored grain pests in a certain depth in time. In theory, phosphine penetration depth of about 3m. In fact, with the increase of foodstuffs stacking, manpower into warehouses and custody of the way, the degree of grain piling increased, hindering the penetration of gas, far less than the theoretical requirements of smoked. My county had for the conventional fumigation drug penetration depth determination, found below 2m drug concentration can not be measured