CAJ | 학술논문

采用Tessier五步连续提取法,研究了南京市莫愁湖、玄武湖、秦淮河13个底泥样品中的重金属的形态分布情况,分析了重金属浸出量与各形态间的相关性及有机质与有机结合态的相关性,并通过红外谱图分析了有机质与重金属结合的机理.结果表明:底泥中Pb,cu,zh,Ni,Cr主要以有机结合态和残渣态俘在,两种形态的含量占总量70%以上,Zn和Cd的可交换态和碳酸盐结合态含量相列较高,Zn约占20%,Cd约占30%;Zn,Cu,Cd,Ni,Cr的浸出量均与可交换离子态呈现显著的相关性,因此可通过减小可交换离子态含量控制底泥重金属污染的风险性;研究还表明,有机质与有机结合态呈现显著的正相关,因此增加底泥中有机质含量有助于重金属向有_棚结合态转化,有机质与重金属的结合主要是由于其中-些官能团和重金属形成稳定的络合物.
채용Tessier오보련속제취법,연구료남경시막수호、현무호、진회하13개저니양품중적중금속적형태분포정황,분석료중금속침출량여각형태간적상관성급유궤질여유궤결합태적상관성,병통과홍외보도분석료유궤질여중금속결합적궤리.결과표명:저니중Pb,cu,zh,Ni,Cr주요이유궤결합태화잔사태부재,량충형태적함량점총량70%이상,Zn화Cd적가교환태화탄산염결합태함량상렬교고,Zn약점20%,Cd약점30%;Zn,Cu,Cd,Ni,Cr적침출량균여가교환리자태정현현저적상관성,인차가통과감소가교환리자태함량공제저니중금속오염적풍험성;연구환표명,유궤질여유궤결합태정현현저적정상관,인차증가저니중유궤질함량유조우중금속향유_붕결합태전화,유궤질여중금속적결합주요시유우기중-사관능단화중금속형성은정적락합물.
Morphological distribution of heavy metals including Pb, Cu, Zn, Cd, Ni, Cr were determined by five steps sequential extraction Tessier methods in 13 bottom sediments of Mochou Lake .Xuanwu Lake and Qinhuai river in Nanjing.The correlation between teachability and various morphology,between organic matter and organic matter-bound heavy metals were arialyzed The mechanism of oiganic matter binding with heavy metal was analysed by using infrared spectroaraThe results indicated that Pb, Cu, Zn, Ni, Cr existed mainly in the form of organic- bound and residual, this two forms accounted fin- more than 70% of the total content, Zn and Cd in exchangeable and carbonate-bound phases accounted for a relatively high content, Zn accounted for about 20%, Cd accounted for about 30%;Most of the heavy metal leaching capacity with the exchangeable phases showed a significant correlation, therefore, it can be controlled the risk of sediment heavy metal contamination by reducing the exchangeable ionic content The studies also showed that mere were a significant positive correlation between organic matter and organic-bound, increasing the concent of organic matter in sediments will be helpful to the conversion of heavy metals to organic-bound, the main reason of the conversion is due to stable complex compound formed by some of the functional groups and heavy metals.