集装箱溴甲烷熏蒸散气速率的初步研究

The preliminary research on the degassing velocity of container fumigation with methyl bromide

集装箱溴甲烷熏蒸散气速率的试验研究表明:集装箱熏蒸后残余溴甲烷的浓度和散气时间、货物的吸附、集装箱内货物的容量有关,与温度、天气状况以及不同规格集装箱关系不显著;通过自然散气8h和3周左右的航行时间就能到达残留低于5ppm(20mg/m3)的要求,但对于装载溴甲烷气体强吸附性的货物、用塑料袋包裹的货物或集装箱装载量过满的货物,应延长散气时间或采取机械协助通风来控制残余气体浓度。

5 ppm（20mg/m^3） of methyl bromide residue concentration has widely been accepted as a safety exposure threshold limit internationally. Research on the degassing velocity of the container fumigation with methyl bromide was conducted and with the results as follows：the concentration of the methyl bromide residue in the container after degassing is very strictly depended on the degassing duration, absorbability and the loading volume of the cargo, but is not obviously interrelated to the air temperature, weather conditions or the size of the container. After 8 hours of degassing in natural condition and 3 weeks of ocean navigation, the residue concentration of MB in containers can mostly decrease to the acceptable level, but for cargo which have strong absorbability or of which wrapping plastic packing or those overloading containers, the duration of passive degassing should be prolonged or applying strong mechanical ventilation to achieve ideal effect.