Aquaculture-derived enrichment of hexachlorocyclohexanes (HCHs) and dichlorodiphenyltrichloroethanes (DDTs) in coastal sediments of Hong Kong and adjacent mainland China.
Aquaculture-derived enrichment of hexachlorocyclohexanes (HCHs) and dichlorodiphenyltrichloroethanes (DDTs) in coastal sediments of Hong Kong and adjacent mainland China.
复制标题
DOI：
10.1016/j.scitotenv.2013.07.027
复制
发表时间：
2014
期刊：
影响因子：
--
通讯作者：
Hong-Sheng Wang;Zhuojia Chen;Zhang Cheng;Jun Du;Y. Man;H. Leung;J. Giesy;C. Wong;M. Wong
中科院分区：
文献类型：
--
作者：
Hong-Sheng Wang;Zhuojia Chen;Zhang Cheng;Jun Du;Y. Man;H. Leung;J. Giesy;C. Wong;M. Wong
为评估香港及邻近内地中国沿岸沉积物的污染情况，对6个海水养殖区的表层和柱状沉积物中六氯环己烷(HCHs)和二氯二苯基三氯乙烷(DDTS)的浓度进行了测定。在表层沉积物(0至5厘米)中，海水养殖沉积物中∑、HCHs和∑和DDT的浓度分别比相应参照点的沉积物中检测到的浓度高约1.3倍和7.7倍，而在1至2公里外的非海水养殖地区的沉积物中检测到这些浓度。同样，在沉积物的核心中，∑、HCHs和∑和DDTs的浓度在海水养殖区分别高出1.2%和14倍。相对于区域背景浓度，o，p‘-DDD的相对浓度以百分比表示，高达8.67×103%。据推测，富含有机氯农药(OCP)的主要来源是使用受污染的鱼饲料和用于维护鱼笼的防污涂料。生态风险评估结果表明，浓缩的有机氯农药有很大的潜力污染周围的海洋环境，并对相关的生物群造成不利影响。据我们所知，这是第一次评估海水养殖和天然沿海沉积物中有机氯农药污染的差异。
To evaluate contamination of sediments along the coast of Hong Kong and adjacent mainland China, concentrations of hexachlorocyclohexanes (HCHs) and dichlorodiphenyltrichloroethanes (DDTs) in surface and core sediments were measured in six mariculture zones. In surface sediments (0 to 5 cm), concentrations of ∑ HCHs and ∑ DDTs in mariculture sediments were approximately 1.3- and 7.7-fold greater, respectively, than those detected in sediments at corresponding reference sites, which were 1 to 2 km away in areas where there was no mariculture. Similarly, in cores of sediments, concentrations of ∑ HCHs and ∑ DDTs were 1.2- and 14-fold greater in mariculture zones, respectively. Enrichment relative to regional background concentrations, expressed as percentages was as large as 8.67 × 103% foro,p'-DDD. The major sources of the enriched organochlorine pesticides (OCPs) were hypothesized to be derived from the use of contaminated fish feeds and anti-fouling paints for maintaining fish cages. Results of ecological risk assessments revealed that enriched OCPs had a large potential to contaminate the surrounding marine environment and lead to adverse effects on the associated biota. To our knowledge, this is the first study to evaluate the differences of OCP contaminations between mariculture and natural coastal sediments.