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首页> 外文期刊>Journal of Hazardous Materials >Sequential extraction for evaluating the leaching behavior of selected elements in municipal solid waste incineration fly ash
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Sequential extraction for evaluating the leaching behavior of selected elements in municipal solid waste incineration fly ash

机译：顺序萃取法评价城市垃圾焚烧飞灰中某些元素的浸出行为

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摘要

A sequential extraction method has been applied for the determination of binding forms of trace elements in the municipal solid waste incineration (MSWI) fly ash and evaluating their leaching behavior in view of their potential environmental impact. The elemental determinations in the different leachates are performed by ICP-AES and ICP-MS, respectively. The morphology and mineralogical phases after extraction step were performed by scanning electron microscopy (SEM). Total of 20 elements in the samples are investigated. A reference material of city waste incineration fly ash (BCR No. 176) is also tested to examine the applicability as well as accuracy of the proposed method. The sum of most elements present in the individual fractions shows a good agreement with the total elemental concentrations. The extraction efficiencies are generally higher than 80% except for that of Cr and V. The extractable data of most elements give information about the binding forms of various elements in both incineration fly ashes. It was found that the elements such as Ca, K, Na, Pb, Zn, Cd, Cu and Sr have exhibited a remarkable mobility in fly ash. More than half of them would be dissolved or exchanged under a mild leaching condition. The toxic elements such as Pb, Cd, Zn and Cu have a great potential to be released into the environment under normal conditions.
机译：顺序提取方法已用于确定城市固体废物焚烧（MSWI）粉煤灰中微量元素的结合形式，并考虑其潜在的环境影响来评估其浸出行为。分别通过ICP-AES和ICP-MS进行不同浸出液中的元素测定。提取步骤后的形态和矿物相通过扫描电子显微镜（SEM）进行。样本中总共调查了20种元素。还对城市垃圾焚烧飞灰的参考材料（BCR第176号）进行了测试，以检验该方法的适用性和准确性。各个馏分中存在的大多数元素的总和与总元素浓度显示出良好的一致性。除铬和钒外，提取效率通常高于80％。大多数元素的可提取数据可提供有关两种焚烧飞灰中各种元素结合形式的信息。发现钙，钾，钠，铅，锌，镉，铜和锶等元素在粉煤灰中显示出显着的迁移率。它们的一半以上在温和的浸出条件下会溶解或交换。在正常条件下，Pb，Cd，Zn和Cu等有毒元素具有释放到环境中的巨大潜力。

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