State Key Laboratory of Organic Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China.
Environ Pollut. 2011 Oct;159(10):2301-9. doi: 10.1016/j.envpol.2011.05.011. Epub 2011 Jun 12.
The mass transport budgets of 1,1,1-trichloro-2,2-bis(chlorophenyl)ethane (p,p'-DDT) and decabromodiphenyl ether (BDE-209) in the Pearl River Delta, South China were calculated based on previously collected data. Residual p,p'-DDT, mostly related to historical use, has largely settled into soil (780,000 kg), while the soil BDE-209 inventory (44,000 kg) is considerably smaller. Conversely, large amounts of BDE-209 currently used in numerous commercial products have resulted in a much higher atmospheric depositional flux of BDE-209 (28,100 kg/yr) relative to p,p'-DDT (310 kg/yr). The soil inventory of p,p'-DDT is predicted to decrease to half of its current value after 22 years, and the percent area containing soil p,p'-DDT at levels exceeding the effects range-medium (27 ng/g) will decrease from 40% to 20%. Finally, soil BDE-209 inventory will reach an equilibrium value of 940 tons in ~60 years, when BDE-209 levels in 50% of soil will be above an equivalent risk guideline value (125 ng/g).
基于先前收集的数据，计算了中国珠江三角洲地区 1,1,1-三氯-2,2-双(氯苯基)乙烷 (p,p'-DDT) 和十溴二苯醚 (BDE-209) 的物质传输预算。残留的 p,p'-DDT 主要与历史用途有关，已大量沉降到土壤中（78 万千克），而土壤中 BDE-209 的存量（4.4 万千克）则要小得多。相反，大量目前用于众多商业产品的 BDE-209 导致其大气沉积通量比 p,p'-DDT（310 千克/年）高得多（28,100 千克/年）。预计 22 年后，p,p'-DDT 的土壤存量将降至当前水平的一半，土壤中 p,p'-DDT 含量超过中效应范围（27 纳克/克）的面积比例将从 40%降至 20%。最后，土壤中 BDE-209 的存量将在约 60 年内达到 940 吨的平衡值，届时 50%的土壤中 BDE-209 的含量将超过等效风险指导值（125 纳克/克）。
