CAJ | 학술논문

于2013－2014年间对湖州市5个县（区）98个养殖池塘及其周边外河采集表层沉积物，原子吸收法测定Cu、 Zn、 Pb、 Cd、 Cr 干重，原子荧光法测定 Hg、 As 干重。结果表明：养殖池塘表层沉积物中相对土壤背景值Cd、 Zn 污染程度较高，绝对浓度分别为0.24 mg／kg 和105.82 mg／kg， As 较为清洁；县（区）间养殖池塘表层沉积物 Hakanson 潜在生态风险均为中等污染水平，远低于周边外河，但高于本地区耕地等土壤的污染水平，说明渔业生产过程中存在输入性污染；单个重金属生态风险系数中 Cd 为强、 Hg 为中等，依次为 Cu、 Pb、 As、 Cr、Zn，均为轻微生态风险水平。此外，池塘表层沉积物中 Cu、 Zn、 Cr 两两之间显著相关，符合这三种重金属在水产饲料中同时添加的特性；而 Cd 与 Cu、 Zn 显著相关，一定程度上印证了 Cd 在水产饲料中可能超标的事实，但其生态风险系数远低于周边外河表层沉积物，所以周边流域外源性 Cd 输入风险也需要关注。
우2013－2014년간대호주시5개현（구）98개양식지당급기주변외하채집표층침적물，원자흡수법측정Cu、 Zn、 Pb、 Cd、 Cr 간중，원자형광법측정 Hg、 As 간중。결과표명：양식지당표층침적물중상대토양배경치Cd、 Zn 오염정도교고，절대농도분별위0.24 mg／kg 화105.82 mg／kg， As 교위청길；현（구）간양식지당표층침적물 Hakanson 잠재생태풍험균위중등오염수평，원저우주변외하，단고우본지구경지등토양적오염수평，설명어업생산과정중존재수입성오염；단개중금속생태풍험계수중 Cd 위강、 Hg 위중등，의차위 Cu、 Pb、 As、 Cr、Zn，균위경미생태풍험수평。차외，지당표층침적물중 Cu、 Zn、 Cr 량량지간현저상관，부합저삼충중금속재수산사료중동시첨가적특성；이 Cd 여 Cu、 Zn 현저상관，일정정도상인증료 Cd 재수산사료중가능초표적사실，단기생태풍험계수원저우주변외하표층침적물，소이주변류역외원성 Cd 수입풍험야수요관주。
During the period of 2013 to 2014, sediment samples from aquaculture ponds and their nearby rivers were col -lected from 5 counties (or districts) in Huzhou City.The contents of Cu, Zn, Pb, Cd, Cr in all the samples were deter-mined by using an atomic absorption spectrophotometer and the contents of Hg and As were analyzed by using an atomic flu -orescence spectrophotometer with the recommended instrument parameters .Results showed that the contents of Cd and Zn in collected samples were higher than those in the background soils , with the concentrations of 0.24mg/kg and 105.82 mg/kg in dry weight, respectively; while the concentration of As was at a clear level .The middle level of Hakanson potential risks from 5 counties was much lower than the level of sediments from nearby rivers but higher than that from the cultivated lands in Huzhou district, implying that activities of aquaculture production may lead to heavy metal pollution .Results of Hakan-son potential ecological risk assessment showed that the decreasing values of the hazard risk indices were Cd , Hg, Cu, Pb, As, Cr, Zn in sequence, among which Cd and Hg were in strong and middle level of risk , respectively, others were at a slight level.The significant linear relationships among Cu , Zn and Cr implied that they probably had the same sources from fish feeds.Besides, the significant relationships between Cd , Cu and Zn indicated Cd might exists in fish feeds.Meanwhile, the potential ecological risk of Cd in aquaculture ponds was much lower than those in nearby rivers.Hence, more attentions should be paid to the exotic sources of Cd pollution .