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Insight into the heavy metal binding properties of dissolved organic matter in mine water affected by water-rock interaction of coal seam goaf
Chemosphere ( IF 8.8 ) Pub Date : 2020-11-28 , DOI: 10.1016/j.chemosphere.2020.129134
Kai Zhang , Ju Gao , Dongpo Men , Xiyang Zhao , Shanshan Wu

The water-rock interaction has a significant effect on the binding characteristics of dissolved organic matter and heavy metals when mine water flows in goaf. This study used fluorescence excitation-emission matrix (EEM) quenching combined with parallel factor (PARAFAC) analysis to characterize the binding properties of DOM with Fe (Ⅲ), Fe (Ⅱ+Ⅲ) and Mn (Ⅱ) in mine water under rock-influenced conditions. Two protein-like components and two humic-like components were identified by PARAFAC, in which protein-like components dominated (75.9%). The fluorescence intensity of each component can all be weakened, especially the stability constant (logKM) value of Fe (Ⅱ+Ⅲ) with fulvic-like acid and humic-like acid was the largest and the binding was more stable. Clay minerals and iron-bearing minerals in rocks had significant effects on the binding characteristics of DOM and metal ions under water-rock interaction. Iron ions released by the oxidation of pyrite and siderite in sandstone can reduce the fluorescence intensity of the derived components. The competitive adsorption effect of clay minerals on metal ions made the fluorescence intensity of the derived components under the action of sandstone containing less clay minerals (19.5%) be lower than that of mudstone (31.3%). Meanwhile, the process of water-rock interaction was accompanied by microbial activities to convert protein-like components into fulvic-like and humic-like components, or higher levels of stable substances. This study shows that when assessing the potential ability of mine water DOM and metal ions binding and migration during the flow of water in goaf it is crucial to take into account the presence of water-rock interaction.



中文翻译:

煤层采空区水岩相互作用对矿山水中溶解有机物重金属结合特性的影响

当矿井中的水流过时,水-岩相互作用对溶解的有机物和重金属的结合特性有重要影响。该研究采用荧光激发-发射矩阵(EEM)猝灭结合平行因子(PARAFAC)分析来表征岩石在矿山水中矿物质中DOM与Fe(Ⅲ),Fe(Ⅱ+Ⅲ)和Mn(Ⅱ)的结合特性。影响的条件。PARAFAC鉴定出两个蛋白样成分和两个腐殖质样成分,其中以蛋白样成分为主(75.9%)。每个组分的荧光强度都可以减弱,尤其是稳定性常数(log K MFe(Ⅱ+Ⅲ)与黄腐酸和腐殖酸的结合值最大,结合更稳定。在水-岩相互作用下,岩石中的粘土矿物和含铁矿物对DOM和金属离子的结合特性有显着影响。砂岩中黄铁矿和菱铁矿的氧化释放出的铁离子可以降低衍生组分的荧光强度。粘土矿物对金属离子的竞争吸附作用使得在粘土矿物含量较少的砂岩(19.5%)的作用下,衍生组分的荧光强度低于泥岩(31.3%)。同时,水-岩相互作用的过程伴随着微生物的活动,将蛋白质样成分转化为黄腐病毒样和腐殖质样成分,或更高水平的稳定物质。

更新日期:2020-12-01
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