Personal Chemical Exposure Program, Department of Entomology, University of California, Riverside, CA 92521, USA.
Mar Pollut Bull. 2012 Jul;64(7):1300-8. doi: 10.1016/j.marpolbul.2012.05.010. Epub 2012 Jun 8.
DDT, DDE and some additional lipophilic derivatives are recognized contaminants in sediments of Southern California Bight (SCB). Only about 10% of total DDTs discharged into the SCB are accounted for using available monitoring data (sediment, water, and biota). DDA represented up to 0.03% DDTs (DDT/DDE/DDD) in SCB surface sediments (top 2 cm) in amounts up to 76 μg DDA/kg dry weight. Highest DDA levels were found where DDT and DDD levels were maximal at the primary wastewater outfall indicating a natural precursor-product relationship for DDT and DDA. Still culture of SCB sediment revealed limited DDA formation following DDT fortification. DDA residues have also been found in contaminated Long Island, NY sediments provided by USGS. The formation of DDA and its potential release from sediments may be significant in resolution of uncertainties concerning the natural recovery of sediments in DDT-contaminated environments.
DDT、DDE 和一些其他亲脂性衍生物被确认为南加州湾（SCB）沉积物中的污染物。仅利用现有监测数据（沉积物、水和生物群）就可以解释 SCB 中排放的总 DDT 的约 10%。在 SCB 表层沉积物（顶部 2 厘米）中，DDA 占 DDTs（DDT/DDE/DDD）的比例高达 0.03%，含量高达 76 μg DDA/千克干重。在主要污水排放口处 DDT 和 DDD 水平最高的地方，DDA 水平最高，表明 DDT 和 DDA 之间存在自然前体-产物关系。SCB 沉积物的静态培养表明，在 DDT 强化后，DDA 的形成有限。美国地质调查局提供的受污染的纽约长岛沉积物中也发现了 DDA 残留。DDA 的形成及其从沉积物中的潜在释放可能对解决 DDT 污染环境中沉积物自然恢复的不确定性具有重要意义。
