A STATISTICAL ASSESSMENT OF THE FORM OF TRACE-METALS IN OXIDIZED ESTUARINE SEDIMENTS EMPLOYING CHEMICAL EXTRACTANTS
A STATISTICAL ASSESSMENT OF THE FORM OF TRACE-METALS IN OXIDIZED ESTUARINE SEDIMENTS EMPLOYING CHEMICAL EXTRACTANTS
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DOI：
10.1016/0048-9697(81)90182-0
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发表时间：
1981-01-01
影响因子：
9.8
通讯作者：
BRYAN, GW
中科院分区：
文献类型：
--
作者：
LUOMA, SN;BRYAN, GW
沉积物-水界面处的氧化沉积物薄层在河口微量金属的化学和生物相互作用中发挥着重要作用。化学萃取剂可用于确定沉积物中的痕量金属相互作用。提取可能有助于确定操作上定义的底物形式的丰度，这些底物在沉积物中结合金属最活跃；在操作上定义沉积物中痕量金属的可提取相；并提供确定沉积物结合金属的生物利用度所需的信息。对英格兰南部和西部 19 个河口沉积物中 10 种金属和底物提取技术的比较表明，底物表征最好通过使用酸性草酸铵或 1N HCl 提取铁和锰，以及使用 0.1N NaOH 或 1N 氨水提取腐殖质来完成。痕量金属的部分分馏最好使用 1N HCl 来完成。统计关系表明，Fe 的可萃取相在氧化沉积物中结合 Ag、Cd、Cu、Pb 和 Zn 方面比总 Fe 更重要，并且有机材料中操作定义的腐殖质部分对于结合 Ag 和 Cu 非常重要。特定数据子集内的统计分析表明，痕量金属在大多数沉积物中分布在多种底物中，底物之间相互竞争金属，并且竞争的结果受到沉积物中不同底物浓度的强烈影响。
The thin layer of oxidized sediment at the sediment-water interface plays an important role in the chemical and biological interactions of trace metals in estuaries. Chemical extractants can be useful in defining trace metal interactions in sediments. Extractions may aid in determining the abundance of the operationally-defined forms of substrates which are the most active in binding metals in sediments; in operationally-defining an extractable phase of trace metals in sediments; and in providing information necessary for determining the bioavailability of sediment-bound metals. Comparison of 10 techniques for metal and substrate extractions among the sediments of 19 estuaries from south and west England [UK] indicate substrate characterization is best accomplished by Fe and Mn extractions with acid ammonium oxalate or 1N HCl, and humic substances extraction with 0.1N NaOH or 1N ammonia. Partial fractionation of trace metals is best accomplished with 1N HCl. Statistical relationships indicate the extractable phase of Fe is more important than total Fe in binding Ag, Cd, Cu, Pb and Zn in oxidized sediments, and the operationally-defined humic substance fraction of organic materials is highly important in binding Ag and Cu. Statistical analysis within specific subsets of data indicate trace metals are partitioned among several substrates in most sediments, the substrates compete with one another for the metals, and the outcome of the competition is strongly influenced by the concentrations of the different substrates in the sediment.