Test on Recirculation Fumigation under Film with Mized Gas of PH3-CO2 in Steel Cylinder
In order to research the applied technology of film sealing technology of the grain surface combined with recirculation fumigation of a mixed gas of PH3-CO2 PH32%+CO2 98% （w/w) ,we performed field tests on recirculation fumigation under film in a warehouse. The warehouse was 54.36m long,35.26m wide and the loaded grain height 6m. There were 7650t of bulk wheat stored in the warehouse, and five test points of gas concentration and five testinsect cages were located in the warehouse. Supply 250kgs of mixed gas of PH3+CO2 and open recirculation ventilator to run for 12 hours, and then stop. Begin to test the gas concentration three hours after application, after that test the gas concentration of PH3 in the warehouse once a day,degas after 21 days and take the testinsect cages out to check mortality. Culture the tested insects for 30 days (25 ℃75% RH) and then check mortality. In this research, we used No. 23 warehouse with the same conditions as the control warehouse which used normal aluminum phosphide fumigation with application on grain surface and application on buried bags. The No. 23 warehouse is the same as the tested warehouse in terms of locations of test points of gas concentration and testinsect cages, and sampling and testing methods. The result shows that the pressure halflife of the tested warehouse were 4s (-30Pa to -15Pa), and the average, M in.and Max. concentration of PH3at each location of the tested warehouse on the 7th day, 14th day and 21st day were 198 (136-266),132(86-170) and 86(58-115) mL/m3 respectively,the ratio of Min.concentration and Max. concentration of each gas sampling point was 1 : 2. The distribution of PH3 concentration at each location in the warehouse was uniform and four kinds of tested pests of fullstages (adult, egg, larvae and pupa) preburied in grain piles before test were killed completely;the pest control was 100%. The dosage applied to the control warehouse was three times as much as that of the recirculation fumigation under film with mixed gas of PH3 CO2; on the 7h day and 14th day after fumigation, the tested gas concentrations of PH3 at the same location and same depth were 173 (45-251)and 101 (26-156)mL/m3 respectively; the ratio of Min. concentration and Max. concentration was more than 1:5,and the distribution of PH3 concentration was not very uniform; degas 14 days after end of fumigation and there was no live adult found after sampling and checking, the death ratio of adults being 100%. But after three weeks, live adults were found again in parts of the warehouse, and the density was 7 aduhs/kg,in which there were two Rhizopertha dominica (Fabricius) and five Cryptolestes ferrugineus (Stephens); the pest control was worse. Therefore, pest killing technology of recirculation fumigation under film with mixed gas of PH3-CO2 not only improves airtightness and uniformity of fumigation, reducing dosage and improvirig efficacy, but also saves time and work. It is an easy and safe operation.
high and flat warehouse stored-grain pests hydrogen phosphide carbon diozide recirculation fumigation
Yang Xinzhong Song Lishan Li Hailong Xin Liyong Li Guangtao Shi Zhiguo Liu Guihe Li Yanyu Cao Yang
China Grain Reserves Corporation Beijing Branch Beijing 100045 State Grain Reserves Sanhe Depot, Hebei 065206 Academy of State Administration of Grain, Beijing 100037
国际会议
成都
英文
274-279
2008-09-21（万方平台首次上网日期，不代表论文的发表时间）