Particle deposition fluxes of BDE-209, PAHs, DDTs and chlordane in the Pearl River Delta, South China.
Particle deposition fluxes of BDE-209, PAHs, DDTs and chlordane in the Pearl River Delta, South China.
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DOI：
10.1016/j.scitotenv.2010.04.048
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发表时间：
2010-08
期刊：
影响因子：
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通讯作者：
Jun Li;Xiang Liu;Gan Zhang;Xiangdong Li
中科院分区：
文献类型：
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作者：
Jun Li;Xiang Liu;Gan Zhang;Xiangdong Li
2003年12月至2004年11月，在珠江三角洲（PRD）15个采样点，每两个月采集一次大气颗粒物样品，测定了BDE-209、PAHs、DDTs和叶绿素的颗粒相沉降量。BDE-209、总多环芳烃（15种化合物）、总滴滴涕（p，p′-DDE、p，p ′-DDD、p，p′-DDT和o，p′-DDT的总和）和三氯异氰尿酸（反式三氯异氰尿酸和顺式三氯异氰尿酸的总和）的年沉降通量分别为32.6至1970μgm − 2 yr −1、22至290μgm− 2 yr −1、0.8至11μgm− 2 yr −1和0.25至1.9μgm− 2 yr −1。所有化合物的空间变异在珠三角中心较高，在沿海较低。沉积的季节变化被认为是化合物依赖性的，受到许多因素的影响，如源输入的时间，温度和降水等，特别是，源输入时间影响的沉积通量的BDE-209和高质量的多环芳烃，而温度依赖的气-粒分配是一个关键因素的DDT和轻质量的多环芳烃沉积。在整个采样期内，香港大气中的BDE-209、1，2，4，6，8-PAHs、1，2，4，8-DDTs和氯丹的沉降量分别约为93、86、2.1和2.1kgyr−1，而珠江三角洲的沉降量则分别约为13，400、2950、82和63 kgyr −1。通过比较计算出的空气沉积总量与土壤中的负荷量，估计BDE-209在土壤中的半残留时间为3年。
Year-round bulk air deposition samples were collected at 15 sites in the Pearl River Delta (PRD) on a bimonthly basis from Dec 2003 to Nov 2004, and the particle-phase deposition of BDE-209, PAHs, DDTs and chlordane was measured. The annual deposition fluxes of BDE-209, total PAHs (15 compounds), total DDT (sum of p,p′-DDE, p,p′-DDD, p,p′-DDT, and o,p′-DDT ), and chlordane (sum of trans-chlordane and cis-chlordane) varied from 32.6 to 1970μgm−2yr−1, 22 to 290μgm−2yr−1, 0.8 to 11μgm−2yr−1, and 0.25 to 1.9μgm−2yr−1, respectively. Spatial variations were higher in the centre of the PRD and lower at the coastal sites for all compounds. The seasonal variations of deposition were found to be compound-dependent, influenced by a number of factors, such as the timing of source input, temperature, and precipitation etc. In particular, source input time affected the deposition fluxes of BDE-209 and high-weight PAHs, while temperature-dependent gas–particle partitioning was a key factor for DDT and light-weight PAH deposition. During the whole sampling period, the atmospheric deposition of BDE-209, ΣPAHs, ΣDDTs, and chlordane onto Hong Kong reached about 93, 86, 2.1 and 2.1kgyr−1, respectively, and onto the PRD reached about 13,400, 2950, 82, and 63kgyr−1. By comparing the calculated total air deposition with the burden in the soils, the half residual time of BDE-209 in soils was estimated to be 3years.