Comparison of metal (Zn and Cu) complexation characteristics of DOM in urban runoff, domestic wastewater and secondary effluent
Comparison of metal (Zn and Cu) complexation characteristics of DOM in urban runoff, domestic wastewater and secondary effluent
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DOI：
10.2166/wst.2010.517
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发表时间：
2010-01-01
影响因子：
2.7
通讯作者：
Kurisu, Futoshi
中科院分区：
文献类型：
--
作者：
Chaminda, G. G. Tushara;Nakajima, Fumiyuki;Kurisu, Futoshi
本研究旨在比较道路径流、污水处理厂（WWTP）出水和进水中Zn和Cu与溶解性有机物（DOM）的结合参数。条件稳定常数（K '）和结合位点浓度（[L]）是预测水环境中游离或不稳定金属浓度和毒性的重要参数。用金属滴定法和Scatchard线性化法测定了三种DOMs的K和[L]值。污水处理厂出水和进水中DOM的Zn和Cu滴定数据符合双配体模型，而道路径流中DOM符合单配体模型。Zn和Cu的K'值大小顺序均为污水处理厂进水>污水处理厂出水>道路径流。道路径流DOM中的总环境结合位点浓度（[L（T）]）（1.4-1.5 μ M）低于污水厂出水DOM（1.6-2.3 μ M）和进水DOM（17-18 μ M），表明道路径流DOM的金属络合能力较低。预计污水处理厂进水中的DOM与Zn和Cu的结合比出水DOM更强。
This study was aimed at comparing the Zn and Cu binding parameters with dissolved organic matter (DOM) in road runoff, wastewater treatment plant (WWTP) effluent and influent. Conditional stability constant (K') and binding site concentration ([L]) are important to predict free or labile metal concentration and toxicity in the water environment. The values of K and [L] of three DOMs were determined by metal titration and Scatchard linearization. The Zn and Cu titration data for DOMs in WWTP effluent and influent fitted to a two-ligand model, while DOM in road runoff fitted to a single-ligand model. The order of the values of K' was WWTP influent > WWTP effluent > road runoff both for Zn and Cu. Total ambient binding site concentration ([L(T)]) was lower in DOM of road runoff (1.4-1.5 mu M) than those in DOM of WWTP effluent (1.6-2.3 mu M) and influent (17-18 mu M), suggesting lower metal complexation capacity in DOM of road runoff. DOM in WWTP influent was expected to bind to both Zn and Cu more strongly than that of the effluent DOM.