摘要
运用GC／ECD对泉州湾表层沉积物下、上层共24个样品DDTs进行分析，结果表明：沉积物上层内湾、秀涂一石湖一线、外湾总DDTs浓度范围分别为3．23～25．23ng／g、4．13～10．36ng／g、0．03～0．84ng／g，平均浓度依次为13．88ng／g、7．78ng／g、1．72ng／g；下层分别为2．30～6．92ng／g、3．83～17．50ng／g、0．57～14．88ng／g，平均浓度依次为4．60ng／g、8．17ng／g、4．1lng／g。（DDD＋DDE）／DDTs比值为0．1l～1．00．上层沉积物DDE／DDTs比值远小于1。DDE／DDD表明降解主要处于厌氧环境下．污染物主要来自污水直接排放。风险评价表明，沉残留有机污染物毒性风险已经大于75％．会对泉州湾海产养殖产生一定影响。
Levels of DDT and its metabolite residues in both upper sediments（up to 2 cm） and surface sediments （2 cm～10 cm） from 12 sampling locations of Quanzhou Bay, China, are determined. DDTs residues in upper sediment of estuarine, borderline and offshore sediments are in the range of 3.23～25.23 ng/g, 4. 13～10.36 ng/g, 0.03～0.84 ng/g and 6.18～42.13 ng/g, while the mean values are 13.88 ng/g,7.78 ng/g and 1.72 ng/g, respectively. Those in lower sediments are 2.30～6.92ng/g,3.83～17.50 ng/g and 0.57～14.88 ng/g, and the average values are correspondingly 4.60 ng/g,8.17 ng/g and 4. 11 ng/g, respectively. Ratios of（DDD＋DDE） to DDTs range from 0. 11 to 1.00, while those of DDE to DDTs in upper sediments of Quanzhou Bay are less than 1. DDE/DDD demonstrates DDT degraded under the anaerobic condition, suggesting DDTs＇ entry to the estuary mainly via direct discharge rather than long-rang transfer. Moreover, risk assessment depicts DDT series could impose higher risk on bottom feeders of the Bay.
出处
《安全与环境工程》
CAS
2006年第1期41-44,共4页
Safety and Environmental Engineering
基金
福建省泉州湾
兴化湾生态地球化学预警项目(200414200009-2-3)资助
