煤及木材燃烧飞灰中有毒金属形态分布

Speciation Distributions of Toxic Metal Associated with Coaland Wood Combustion Fly Ash Particulates

选取３种燃煤产生的飞灰颗粒物和一种燃木产生的飞灰作为研究对象，为了更好地了解颗粒物上有毒金属被浸取进入液相情况，分析３种不同浸取剂（二乙三氨五乙酸（ＤＴＰＡ）、乙二胺四乙酸（ＥＤＴＡ）和氨三乙酸（ＮＴＡ））的提取液中有毒金属Ｐｂ、Ｃｒ、Ｃｏ、Ｎｉ、Ｍｎ、Ｃｕ、Ｚｎ、Ｃｄ、Ａｓ、Ｓｒ等的含量．结果表明，金属浓度因飞灰种类、浸取剂种类及金属本身类型不同而不同．由于颗粒物上金属的生物可利用性、毒性及可流动性与其存在形态密切相关，选取连续浸取法来考察飞灰颗粒物上金属形态分布情况，结果表明。

Three fly ash particulate samples collected from coalfired heating boilers and one wood combustion fly ash was collectedIn order to get a better understanding of toxic metal extraction from fly ash particulates,three different extractants(diethylenetriaminepentacetic acid,DTPA; ethylenediaminetetracetic acid, EDTA;nitrolotriacetate, NTA)were used to analyze various toxic metal contents,such as lead,chromium,cobalt,nickel,manganese,copper,zinc,cadmium,arsenic,and strontiumIn general,dominant metal concentrations in various fly ashes were different,depending on the fly ashes,types of extractants and metalsBecause metal speciation is closely related to bioavailability,toxicity,and mobility,sequential extraction procedures were carried out to explore the metal speciation in the fly ashesIt is indicated that speciation distribution of toxic metal elements in both kinds of wood and coal combustion fly ashes is different