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Conceptual hydrogeochemical characteristics of a calcite and dolomite acid mine drainage neutralised circumneutral groundwater system

机译：方解石和白云石酸性矿山排水中和的中性地下水系统的概念水文地球化学特征

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摘要

This article presents and discusses conceptual hydrogeochemical characteristics of dolomite and calcite acid mine drainage (AMD) neutralised circumneutral groundwater system. The conceptual discussions are based on the consideration of calcite and dolomite AMD buffering hydrogeochemical processes. Using theoretical chemical reaction stoichiometry, predictions are made for molar ratios of associated AMD – calcite and dolomite buffering reaction products (SO42?, Ca2+and Mg2+). Comparison is made between stoichiometrically predicted molar ratios of SO42?/Ca2+, SO42?/Mg2+, Ca2+/Mg2+and field data from previous studies in South Africa. There is a close match between stoichiometrically predicted molar ratios of the calcite and dolomite AMD neutralisation reaction products and field data. The results provide basis to improve the conceptual understanding of hydrogeochemical processes associated with dolomite and calcite AMD neutralisation which is important for field investigations related to mine-water quality, water management, remediation and overall environmental protection. Results further demonstrates the potential usefulness of relating ion concentration molar ratios of field measurements to stoichiometric predictions as a tool to identify hydrogeochemical processes controlling the evolution of groundwater chemistry.
机译：本文介绍并讨论了白云石和方解石酸矿井排水（AMD）中和的环境中性地下水系统的概念水文地球化学特征。概念性讨论是基于对方解石和白云石AMD缓冲水地球化学过程的考虑。使用理论化学反应化学计量学，可以预测相关AMD –方解石和白云石缓冲反应产物（SO42？，Ca2 +和Mg2 +）的摩尔比。比较了化学计量预测的SO42 + / Ca2 +，SO42 + / Mg2 +，Ca2 + / Mg2 +的摩尔比和南非先前研究的田间数据。方解石和白云石AMD中和反应产物的化学计量预测的摩尔比与现场数据之间存在密切匹配。研究结果为改善与白云石和方解石AMD中和有关的水文地球化学过程的概念理解提供了基础，这对于与矿井水水质，水管理，修复和整体环境保护有关的现场调查非常重要。结果进一步证明，将现场测量的离子浓度摩尔比与化学计量的预测相关联，可以作为识别控制地下水化学演变的水文地球化学过程的工具。

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