硫酰氟熏蒸处理集装箱扩散规律初步研究

The Diffusion and ReleasingRules of Sulfuryl Fluoride during and after Fumigation Processing Operation in Container

[目的]研究硫酰氟施药后在集装箱内的扩散规律以及集装箱装载不同的物品对硫酰氟吸附和解吸附作用的差异。[方法]根据集装箱的体积计算施药量,施药后不同时间点及散毒后关闭集装箱门不同时间点,用硫酰氟浓度检测仪测定箱内硫酰氟浓度。[结果]硫酰氟在集装箱内分布不均匀,下层浓度高于中层,中层浓度高于上层。相同施药量时,装载废纸集装箱内硫酰氟实际测量浓度低于装载废塑料集装箱内测量浓度。散毒后再次关闭箱门,箱内物品吸附的硫酰氟解吸再次释放出来,装载废旧塑料集装箱的浓度明显高于废纸集装箱内的浓度。[结论]硫酰氟密度大于空气,是其在集装箱上部与下部浓度存在差别的原因。与废塑料相比,废纸的孔隙多,致密程度差,对硫酰氟的吸附与阻留作用强于废塑料,因而吸附硫酰氟的作用更明显,而解吸硫酰氟的速度正好相反,慢于废塑料。

The diffusion rule and adsorption or desorption rule of sulfuryl fluoride administrated in containers were explored. Selecting the sulfuryl fluoride fumigation processing containers as experimental group, the sulfuryl fluoride dosage was calculated according to the volume of the container, the sulfuryl fluoride concentration was measured by sulfuryl fluoride concentration detector at different sites in the container at different time points during the fumigation processing operation, then the sulfuryl fluoride was released till the concentration came to 0ppm. Then the doors were closed for 1hr, 3hrs, 5hrs, 12hrs, after that, the sulfuryl fluoride concentrations in the container were measured again respectively. Sulfuryl fluoride was uneven distribution in the container, the concentrations at lower sites in the container was higher than at middle ones, concentration at middle sites were higher than at top ones. When the container loaded with waste papers, sulfuryl fluoride actual measured concentration was lower than those of container loaded with waste plastics. After sulfuryl fluoride was released, the doors were closed again, the sulfuryl fluoride adsorbed by wastes in the cabinet was released again, concentrations for waste plastic container were obviously higher than for waste paper. Since sulfuryl fluoride density is greater than air, so it was of uneven distribution in containers. Compared with waste plastics, waste paper has more pores, and thus is easy to adsorb and retent sulfuryl fluoride. So, the desorption rate of sulfuryl fluoride by waste papers is slower than by waste plastics.