Phosphine PH3 gas fumigation operation principle and precautions
Phosphine PH3 gas is naturally deliquesced by aluminum phosphide tablets and powders evenly under fumigation environment, releasing fumigant vapor gas phosphine, PH3 passes
The molecular diffusion effect will kill the pests in the stored grain after reaching a certain concentration, which has the effect of protecting the long-term storage of the grain.
The conventional fumigation operation refers to the conventional application method of aluminum phosphide. According to the "Technical Specifications for Grain and Oil Storage (Trial)", the "conventional application method" includes "
Grain application "and" Buried application ". 1. Grain application.
The first is to determine the food application point. According to the area of the warehouse. The surface area of the grain stack, arrange the application points on the surface of the grain stack or stack. Every point
Place a 300-500mm diameter applicator plate, and the distance between the gates of the application points is about 1.3m.
The second is drug application.
Under the direction of the fumigation personnel, the applicator placed the aluminum phosphide agent in the applicator pan on the surface of the grain pile. The tablets or pills in each applicator pan were not over
Over 150 g, powder does not exceed 100 g. Tablets or pills should not overlap; powders should be spread evenly and the thickness should not exceed 0.5cm. Canister (bottle)
After emptying, it should be placed near the applicator tray and must not be taken out of the warehouse. 2. Buried application.
A breathable small cotton cloth bag (8 × 10cm) is used as the pesticide application bag to hold aluminum phosphide, which is mainly used for fumigation of stored grains of about 3m.
The first is to determine the grain storage site;
The second is to put aluminum phosphide into a cloth bag. Choose clear and dry weather outside the warehouse, the charging staff is standing upwind, wearing gas masks and latex hands
Set, the tablets or pills in each bag should not exceed 30g, and the powder should not exceed 20g. The application bag should be bundled intact and connected with a small rope to prevent the medicine from being thrown.
Spread contaminated food and facilitate cleaning.
The third is to bury and apply medicine in small cloth bags. According to the application point selected in advance, the small medicine bag is buried into the grain pile with a hook rod to a depth of 50 to 80 cm. Pay attention to the mouth of the medicine bag
The rope came out of the grain.
The fourth is the withdrawal of the applicator. 3. Probe administration.
Features: It can improve the penetration and diffusion range and speed of phosphine, and improve the utilization rate of phosphine.
Fumigation of grain piles over 4m. The first is to determine the embedding point of the probe; the second is to embed the probe. The loading port of the probe is left 50 to 100 mm above the grain surface; the third is the probe
Tube application. The aluminum phosphide tablet or pill filled in each probe tube does not exceed 20g, and the sealing cap of the probe tube is sealed after being placed. Routine fumigation
The process can be roughly divided into six steps. One is fumigation preparation, the other is to develop a fumigation plan, the third is to check air tightness, the fourth is fumigation application, and the fifth is concentrated.
Degree detection, the sixth is the disposal of air and residue. Matters needing attention: 1. The operator must wear the drug whether in the warehouse or outside the warehouse.
Gas mask that can effectively protect fumigants. Before using the gas mask, carefully check its effectiveness and reliability, such as the expiration date of the canister.
Limit. Use times. Sealability of mask and interface. 2. In order to ensure the safety of personnel in the fumigation work environment and check the toxic gas leakage in the warehouse,
Phosphine alarm can be used to detect the concentration of phosphine in the working environment, and the interface of the relevant pipelines of the fumigation device is mainly detected. If phosphorus in the environment
If the concentration of hydrogen hydride exceeds the safety standard, corresponding safety protection measures must be adopted. 3. Containers containing aluminum phosphide should be opened outdoors. Fumigation
During operation, it is strictly prohibited to drip water and sweat into the medicine. When burning occurs during aluminum phosphide fumigation, dry sand or carbon dioxide
Machine extinguishes fire. In emergencies, loose grain can be used to extinguish the fire. Water is strictly prohibited.
4. As far as possible, test the airtightness of the fumigated grain piles and silos before application.
5. Fumigation or deflation is prohibited at night or in windy and rainy weather. Fumigation with aluminum phosphide to prevent rain in the granary or condensation in the tent to prevent water droplets
Drip into the medicine may cause fire.
6. Before fumigating with aluminum phosphide, the power supply in the warehouse should be cut off. Personnel entering the warehouse are not allowed to wear shoes with iron nails. The metal utensils used must be protected from impact to avoid production.
Sparks are generated, causing combustion and explosion.
7. When fumigating with aluminum phosphide, all metal devices or equipment in the warehouse should be sealed to prevent corrosion of phosphine gas.
8. During fumigation and gas diffusion, non-workers are not allowed to enter the danger zone.
9. Pay attention to safety protection and prevent external pest infections during air release.
10. After the application, leak detection should be performed around the fumigated warehouse or cargo space. If toxic gas leaks out, leakage repair measures should be taken in time.
11. After the application, set up warning lines and anti-poison signs around the fumigation warehouse.