CAJ | 학술논문

选择太湖梅粱湾一处没有外源污染并具有藻类富集特征的岸边带进行了底泥中重金属形态与分布的研究.结果表明,Cu,Ni和Zn在水位变幅区及水向辐射区均有一定程度的富集;Cr和Pb则在水向辐射区有所富集(富集系数＞1).岸边带底泥中这5种重金属的惰性形态百分率均显著低于开阔水体底泥,其中惰性态Ni在岸边带和开阔水体底泥中的含量分别为30.68%±0.56%和34.67%±2.72%,惰性态Pb则分别为25.45%±3.82%和34.17%±0.85%.重金属在岸边带底泥中的惰性形态含量低,说明其活性形态含量高,易于向上层水体迁移.藻类捕获型岸边带底泥中除了少量重金属会向上层水体释放外,总体可以作为湖泊重金属的汇.
선택태호매량만일처몰유외원오염병구유조류부집특정적안변대진행료저니중중금속형태여분포적연구.결과표명,Cu,Ni화Zn재수위변폭구급수향복사구균유일정정도적부집;Cr화Pb칙재수향복사구유소부집(부집계수＞1).안변대저니중저5충중금속적타성형태백분솔균현저저우개활수체저니,기중타성태Ni재안변대화개활수체저니중적함량분별위30.68%±0.56%화34.67%±2.72%,타성태Pb칙분별위25.45%±3.82%화34.17%±0.85%.중금속재안변대저니중적타성형태함량저,설명기활성형태함량고,역우향상층수체천이.조류포획형안변대저니중제료소량중금속회향상층수체석방외,총체가이작위호박중금속적회.
The forms,contents and distribution patterns of 5 heavy metals (Cr,Cu,Ni,Pb,Zn) were surveyed at a lake shore of Meiliang Bay,Taihu Lake,China.This area was characterized by algal enrichment and no allochthonous pollutant input.Cu,Ni and Zn were enriched in sediment samples at both eulittoral and infralittoral subzones,while Cr and Pb were only enriched in the infralittoral subzone (enrichment factor＞ 1).The residual form fractions of all 5 heavy metals in sediments of the littoral subzones were lower than those of the profundal subzone.The residual Ni fraction in the littoral subzone sediments was 30.68%±0.56% and was 34.67%±2.72% in that of the profundal subzone.The residual Pb fraction was 25.45%±3.82% in the littoral subzone sediments and was 34.17%±0.85% in that of profundal subzone.Less residual form fractions in the littoral subzone than those of the profundal subzone means that the more part of heavy metals in the littoral subzone was in the labile form and easy to release to the above water.In the littoral zone with algae accumulation,the sediments generally serve as a sink despite the fact that only a small part of heavy metals could release to the water layer.