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Modeling the Fate of Metal Concentrates in Surface Water

机译：模拟地表水中金属精矿的命运

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Metals present in concentrates are in a solid form and are not bioavailable, but they can dissolve or potentially transform to more soluble forms. Transformation/dissolution laboratory protocols have been developed to assess the importance of dissolution of sparingly soluble metal substances in the context of hazard classification; however, these tests represent worst-case scenarios for metal bioavailability because attenuation mechanisms such as complexation, sorption, and transport to the sediment are not considered. A unit world model (UWM) for metals in lakes, tableau input coupled kinetics equilibrium transport (TICKET)-UWM, has been developed that considers key processes affecting metal transport, fate, and toxicity including complexation by aqueous inorganic and ligands, partitioning to dissolved organic carbon (DOC) and particulate organic carbon (POC), precipitation, and transport of dissolved metals and solids between the water column and sediment. The TICKET-UWM model was used to assess the fate of a metal concentrate and dissolved metal ions released from the concentrate following an instantaneous input to a generalized lake. Concentrate dissolution rates in the water column were parameterized using results from batch transformation/dissolution tests for 2 specific concentrates containing lead (Pb), copper (Cu), and cobalt (Co). The TICKET-UWM results for a generalized lake environment showed that water column concentrations of metals in the lake environment after 28 d were several orders of magnitude lower than the 28-d concentration from the transformation/dissolution tests because Pb, Cu, and Co partitioned to POC in the water column and were subsequently removed due to settling. Resuspension of sediment served to increase total metal in the water column, but the resulting concentrations were still much lower than the 28-d concentrations from the transformation/dissolution tests. Information from TICKET-UWM could be used to refine the environmental hazard profiles of metals. Environ Toxicol Chem 2019;38:1256-1272. (c) 2019 SETAC
机译：精矿中存在的金属为固体形式，不可生物利用，但它们可以溶解或潜在地转变为可溶形式。已经制定了转化/溶解实验室规程，以评估在危害分类的背景下溶解难溶金属物质的重要性；但是，这些测试代表了金属生物利用度的最坏情况，因为未考虑衰减机制，例如络合，吸附和向沉积物的迁移。已开发了湖泊中金属的单位世界模型（UWM），即平台输入耦合动力学平衡迁移（TICKET）-UWM，其中考虑了影响金属迁移，命运和毒性的关键过程，包括无机水溶液和配体的络合，分配至溶解态有机碳（DOC）和颗粒有机碳（POC），沉淀以及水柱和沉积物之间溶解的金属和固体的运输。使用TICKET-UWM模型评估瞬时输入到广义湖泊后，金属精矿和从精矿释放的溶解金属离子的命运。使用分批转换/溶解测试的结果对两种含铅（Pb），铜（Cu）和钴（Co）的特定浓缩液的结果参数化水柱中浓缩液的溶解速率。针对一般湖泊环境的TICKET-UWM结果表明，在28天后，湖泊环境中金属水柱的浓度比转化/溶解试验中的28天浓度低了几个数量级，因为Pb，Cu和Co被分配了在水柱中加入POC，然后由于沉降而除去。沉淀物的重新悬浮增加了水柱中的总金属量，但所得的浓度仍远低于转化/溶解试验的28天浓度。来自TICKET-UWM的信息可用于完善金属的环境危害状况。 Environ Toxicol Chem 2019; 38：1256-1272。 （c）2019年SETAC

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