作　　者： ; ; ; ;

机构地区： 中国广州分析测试中心

出　　处： 《分析化学》 2011年第12期1887-1892,共6页

摘　　要： 采用X-射线衍射法(XRD)对海水养殖区沉积物中重金属形态的连续萃取法进行了考察,并与BCR法萃取能力进行了比较。根据XRD分析结果,连续萃取法和BCR法的非残留态萃取对其结合矿物有较强的提取能力,对残留态的结合矿物影响很小。相比BCR法,连续萃取法的可还原态萃取对其所结合的铁氧化物矿物溶解释放能力较强,对弱酸提取态的结合矿物影响较小。连续萃取法的有机质结合态和BCR法的可氧化态萃取皆对沉积物中可还原态的结合矿物有明显影响,而BCR法的可氧化态萃取对弱酸提取态的结合矿物有较大影响。连续萃取法对可还原态和有机质结合态重金属的萃取能力和选择性优于BCR法,且连续萃取法可分别评价沉积物中重金属有机质结合态和硫化物结合态。 X-ray diffractiometry（XRD） was applied to investigate the extraction ability of the proposal sequential extraction（PSE） procedure for heavy metals speciation in sediments from mariculture area,and compare PSE procedure with European Community Bureau of Reference Sequential extraction method（BCR method）.According to the results of XRD,the sequential extraction for non-residual fractions by PSE procedure and BCR method could strongly liberate their bound minerals to solutions,however,could hardly affect the minerals of residual fraction.The extraction for reducible fraction by PSE procedure could more strongly dissolve ferric oxides that bound reducible fraction than by BCR method;moreover,more slightly affect the minerals that bound weak acid soluble fraction.Except effect on the minerals that bound reducible fraction,the extraction for oxidizable fraction by BCR method had a more significant effect on the minerals that bound weak acid soluble fraction than the extraction for organic matter bound fraction by PSE procedure.PSE procedure has the stronger extraction ability and better selectivity for reducible fraction and organic matter bound fraction than BCR method,and can separately evaluate organic matter bound fraction and sulfide bound fraction.

关 键 词： 沉积物 重金属形态 连续萃取法 矿物相态 射线衍射法

领　　域： [化学工程]