Phosphine is a commonly used fumigation insecticide in the process of grain storage, which can effectively kill pests in grain and oil and ensure the safe storage of grain. However, phosphine is also a toxic and harmful gas to the human body, and when the human body accidentally inhales too high a concentration of phosphine, it will cause poisoning. Therefore, it is very important to ensure environmental safety after fumigation with phosphine.
According to the relevant regulations and standards, it is generally believed that the phosphine concentration value in the ambient air after phosphine fumigation should not exceed 02ml/m3。This is because the occupational exposure limit for phosphine MAC is 03mg m3, which is converted into a parts per million volume ratio, is about 02 up. This concentration value is considered safe and can guarantee the normal activities of personnel in the environment.
In order to ensure safety after phosphine fumigation, there are some relevant regulations and measures that need to be followed. First of all, during the fumigation process, the environment around the applicator and the circulation unit should be monitored, especially at the interface. If a phosphine leak is found, measures should be taken to resolve it in a timely manner. At the same time, the concentration of phosphine in the working environment is monitored, once it exceeds 02ml m3, safety precautions should be taken.
Secondly, if the warehouse window cannot be opened from the outside of the warehouse, you can open the air inlet for ventilation for 1 day. When venting, if the phosphine concentration exceeds 02ml m3, more than two people must cooperate in operation, and wear a self-contained open-circuit compressed air respirator for safety protection. After emptying, the phosphine concentration in the reservoir is reduced to 0Below 2ml m3 is a safe concentration level.
In addition, during the fumigation process, the phosphine alarm device is used to monitor the safety of the fumigation site. When the concentration of phosphine in the environment exceeds 0When the safety standard of 2ml m3 is used, the applicator should wear a self-contained open-circuit compressed air respirator. Pharmacists close holes where they are found.
In addition to the above regulations and measures, there are also some precautions for operation and use. No matter what kind of gas cylinder is used, it should be operated in accordance with the relevant regulations on the storage, transportation, handling and use of gas cylinders. Special attention is paid to the use and handling of toxic gases. In addition, before and after phosphine fumigation, operators are prohibited from drinking alcohol and eating greasy foods such as milk and eggsWorkers feel unwell during the fumigation process and should stop working immediately.
In order to ensure the safety of phosphine fumigation, a portable phosphine gas detector can be used for detection. Taking the ERUN-QB9610-PX3 portable pump-suction phosphine gas detector developed and produced by Winrun Group as an example, it is suitable for the detection of phosphine gas concentration value in the process of grain and oil fumigation, such as slow-release fumigation, low-oxygen fumigation, tent fumigation, and circulation fumigation. The instrument adopts imported high-precision electrochemical sensor, which can accurately detect the concentration value of phosphine PH3 in the air in a very short time. Built-in 800ml min precision gas sampling pump, with hose for real-time detection of phosphine pumping sampling, and can set the automatic alarm function when the concentration is higher than the occupational exposure limit.
To sum up, there is no unified standard for the safety time after phosphine fumigation, because it is difficult to have a qualitative safety time due to the difference in the ventilation and dispersion conditions and structure of the fumigation chamber. However, generally speaking, the standard concentration value of phosphine space residual concentration is used as the main indicator that personnel can enter and exit normally and freely. It should be noted that when carbon dioxide circulation fumigation is used, in order to prevent the excessive accumulation of carbon dioxide from indirectly reducing the oxygen concentration in the local environment, it is generally necessary to detect the oxygen concentration in the space environment at the same time.
In order to ensure the safety of phosphine fumigation, it is necessary to comply with relevant regulations and measures, such as monitoring the environment around the pesticide application device and the circulation device, ventilation and exhaustion, wearing protective equipment, etc. In addition, the use of a portable phosphine gas detector is also a very effective means of detection. Through the application of these measures and tools, the environmental safety after phosphine fumigation can be ensured, and the health and safety of personnel can be guaranteed.