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利用苔藓口袋(Moss bag)和总悬浮颗粒物(TSP)同步监测相结合,研究在上世纪80—90年代土法炼锌地区排放到大气中镉的迁移影响.结果发现,土法炼锌区域100 m内大气TSP中镉含量达129.4 mg·kg-1,土壤中镉含量为12.64 mg·kg-1,Moss bag监测镉总沉降速率达到47.20 mg·m-2·mon-1;在污染源下风方向10 km处TSP中镉含量仍达到27.3 mg·kg-1,土壤中镉含量为2.75 mg·kg-1,Moss bag监测镉总沉降速率达到5.18 mg·m-2·mon-1;随着与污染源距离增加,大气TSP和Moss bag镉沉降速率、土壤中镉含量均呈现逐渐降低的一致性趋势;Moss bag监测镉干沉降速率占总沉降速率的比例变化范围为58%—79%,说明从大气向地面沉降的镉总量中以干沉降为主,是重力影响的由大气向地面沉降的过程.
Using Moss bag and synchronous monitoring of total suspended particulates (TSP), we studied the migration of cadmium from the indigenous zinc smelting zone in the 1980s and 1990s in the atmosphere. The results showed that the zinc smelting zone 100 The content of cadmium in atmospheric TSP was 129.4 mg · kg-1, the content of cadmium in soil was 12.64 mg · kg-1, the total sedimentation rate of Moss bag was 47.20 mg · m-2 · mon-1, The cadmium content in TSP was 27.3 mg · kg-1 at 10 km, the content of cadmium in soil was 2.75 mg · kg-1, the total sedimentation rate of Moss bag was 5.18 mg · m-2 · mon-1, The distance between source and source of pollution increased, the deposition rate of cadmium in atmosphere TSP and Moss bag decreased gradually, and the content of cadmium in soil showed a trend of decreasing gradually. The proportion of cadmium dry deposition rate monitored by Moss bag in total sedimentation rate ranged from 58% to 79% The total amount of cadmium precipitated into the ground in the atmosphere is dominated by dry deposition, which is the process of gravity-induced sedimentation from the atmosphere to the ground.