伊通河沉积物重金属赋存特征的统计分析

分析了长春市伊通河卫星桥(1#),自由大桥(2#)和东大桥(3#)三个采样点不同深度的沉积物样品中Cu,Pb,Zn,Ni,Co,As的含量及赋存形态,并利用多元统计分析方法研究金属间以及不同形态与沉积物性质之间的相互联系,从而深入揭示城市河流沉积物中金属的空间累积规律。结果表明:伊通河1#和2#采样点不同深度的重金属浓度随深度变化幅度不明显,而3#采样点中Pb、Cu和Zn含量随深度变化显著,它们的相对标准偏差分别达到70.3%,48.1%和52.2%。三个采样点中Cu,Pb,Zn显著相关(r=0.914,0.798和0.949),而Ni,Co,As之间呈显著相关关系(r=0.924,0.843和0.812)。说明这2组金属可能分别具有相同的来源和迁移特性。形态分析结果指出,在沉积物中Cu主要与有机质或硫化物相结合,Pb,Zn和Ni主要存在于由铁氧化物结合态和有机/硫化物结合态中,以碳酸盐和锰氧化物形式存在的比例相对较少。统计分析进一步说明,Cu,Pb,Zn与锰氧化物结合方式类似,Pb在有机/硫化物结合态中可能主要与硫化物相结合,而不是有机质。Cu和Zn有机硫化物结合态的含量与有机质的含量密切相关。

Statistical Analysis of Speciation Characteristics of Heavy Metals in Sediment of Yitong River

The concentrations and binding forms of Cu,Pb,Zn,Ni,Co and As in column sediments sampled in Weixing Bridge(1#),Ziyou Bridge(2#)and Dong Bridge(3#)of Yitong River in Changchun,Jilin Province were analyzed.Correlations among various metals and correlations between heavy metals binding fractions and sediment matrices were discussed based on multivariate statistical methods in order to investigate the distribution rule of metals in urban river sediments.Results indicated that heavy metals in site 1# and 2# showed identical trends with sediment depth,but significant changes were found for Pb,Cu and Zn in site 3#,whose relative standard deviations were 70.3%,48.1% and 52.2% respectively.Correlations of Cu,Pb and Zn were 0.914,0.798 and 0.949 respectively,while Ni,Co and As displayed significant correlation,with 0.924,0.843 and 0.812 respectively in the three sites,indicating the same source and transport properties.Based on the speciation patterns of heavy metals,major binging forms of Cu were bound to organic matters or sulfide,and Pb,Zn and Ni mainly existed in Fe oxides and organic/sulfides fractions in the River sediments,but fewer were found in carbonate and Mn oxides fractions for Cu,Pb,Zn and Ni.Results of statistical analysis further showed that the bound types to Mn oxides of Cu,Pb and Zn were similar and Pb in organic/sulfides fraction probable was bound mainly to sulfide,but not to organic matters.However,Cu and Zn in organic/sulfides fractions were controlled by organic matters.