CAJ | 학술논문

对巢湖重污染汇流湾区沉积物中主要重金属分布和累积特征及生态风险进行了分析评价.结果表明：受底泥分布影响,湾区沉积物重金属主要累积于距岸边约700m 以上的低洼区,且表层沉积物(0~2cm)重金属含量大致随泥深增加而增大.基于地积累指数法和潜在生态风险指数法的评价结果表明,除 Hg(Eri=325.5)和 Cd(Eri=240.28)外,大多数重金属处于低风险状态,各金属元素污染顺序为Hg>Cd>Zn>Pb>Cu>As>Cr>Ni.其中,富集倍数最高的Hg和Cd具有同源性,污染等级均为3级.垂向分析表明,受Hg和Cd的影响,0~14cm沉积物已达严重生态风险程度(RI>525),14~34cm沉积物中Hg具有中度生态风险.建议亟须从流域角度对该汇流湾区重金属特别是Hg和Cd进行控制.
대소호중오염회류만구침적물중주요중금속분포화루적특정급생태풍험진행료분석평개.결과표명：수저니분포영향,만구침적물중금속주요루적우거안변약700m 이상적저와구,차표층침적물(0~2cm)중금속함량대치수니심증가이증대.기우지적루지수법화잠재생태풍험지수법적평개결과표명,제 Hg(Eri=325.5)화 Cd(Eri=240.28)외,대다수중금속처우저풍험상태,각금속원소오염순서위Hg>Cd>Zn>Pb>Cu>As>Cr>Ni.기중,부집배수최고적Hg화Cd구유동원성,오염등급균위3급.수향분석표명,수Hg화Cd적영향,0~14cm침적물이체엄중생태풍험정도(RI>525),14~34cm침적물중Hg구유중도생태풍험.건의극수종류역각도대해회류만구중금속특별시Hg화Cd진행공제.
Ecological risk and accumulation of heavy metals in the sediment of the severe polluted confluence area of Lake Chaohu were studied in the present research. The results indicated that heavy metal accumulated mainly in the low-lying area which is about 700m away from the bank and which was influenced greatly by sediment distribution. Levels of heavy metal increased with the increase of sediment depth in surface sediment (0~2cm). Index of geoaccumulation and potential ecological risk index were used to evaluate extent of heavy metal pollution in the studied area. The results indicated most of the metals studied, except Hg (Eri=325.5) and Cd(Eri=240.28), had low ecological risk and they followed a descending order as: Hg>Cd>Zn>Pb>Cu>As>Cr>Ni. Among these metals studied, Hg and Cd ranked high and was classified into grade three and they might originate from the same sources. Seriously, the upper 0~14cm of sediment had presented very high ecological risk (RI>525) because of Hg and Cd. In addition, Hg in the 14~34cm of sediment still had presented moderate ecological risk. Therefore, emergent measures must be taken to control pollution of Hg and Cd in the area studied.