摘要
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.
Moss bag methods and TSP （total suspended particle） were utilized simultaneously to study the transport and deposition of cadmium in the primitive zinc production area emitted during 1980--1990.The results are： within 100 m of the primitive zinc production area, the cadmium contents were measured to be 129.4 mg·kg^-1 in the TSP and 12.64 mg·kg^-1 in the soil. Total deposition rate was 47.20mg·m^-2·mon^-1. At the leeward direction 10 km away from the pollution source, the cadmium contents were 27.3 mg·kg^-1 in the TSP and 2.75 mg·kg^-1 in the soil. While the total deposition rate was 5, 18 mg·m^-2·mon^-1. The study showed a clearly decreasing trend with increasing distance from the pollution source for all the parameters, namely cadmium contents in soil and TSP and deposition rate. Dry deposition accunted for 58%-79% of the total deposition, implying it is the dominant deposition process of cadmium to the ground from the atmosphere, and a gravity induced depostion mechanism.
出处
《环境化学》
CAS
CSCD
北大核心
2014年第4期597-603,共7页
Environmental Chemistry
基金
国家自然科学基金(20067001)资助
