Enrichment mechanism of arsenic in deep confined aquifers of Guide Basin under the influence of geothermal activities

IF 3.1 3区地球科学 Q1 GEOCHEMISTRY & GEOPHYSICS

Applied Geochemistry Pub Date : 2023-10-17 DOI:10.1016/j.apgeochem.2023.105812

Zhen Wang , Huaming Guo , Haiyan Liu , Shiping Xing

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Abstract

High arsenic (As) concentrations in groundwater affected by geothermal activity have been reported worldwide, but the genesis mechanism is not adequately understood. To address this issue, 22 groundwater samples and 69 sediment samples were collected from the Guide basin in northwest China for hydrochemical and geochemical analyses and laboratory experiments. Results indicated that Fe/Mn oxide minerals were the main carriers of As, which was proved by a positive correlation between As and Fe or Mn in sediments. Analysis of hydrologic characteristics showed that direct contribution of As from geothermal water to confined groundwater was probably not significant in the Guide basin. Results of laboratory experiments indicated that As release from aquifer sediments was accelerated by increased temperature under different pH and ORP conditions. Raising temperature may stimulate the release of As by promoting dissolutions of As-bearing Fe (hydr)oxides, weathering of As-bearing silicates and As desorption from sediments into groundwater. The research results can not only increase the understanding of arsenic enrichment mechanism in groundwater under geothermal geological background, but also provide a scientific basis for other high-As groundwater with similar geological background in the world.

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地热活动影响下贵德盆地深层承压含水层砷富集机制

据报道，受地热活动影响的地下水中砷（As）浓度较高，但其成因机制尚不清楚。为了解决这一问题，从中国西北贵德盆地采集了22个地下水样本和69个沉积物样本，用于水化学和地球化学分析以及实验室实验。结果表明，铁/锰氧化物矿物是As的主要载体，沉积物中As与铁或锰呈正相关。水文特征分析表明，Guide盆地地热水中As对承压地下水的直接贡献可能并不显著。室内实验结果表明，在不同pH和ORP条件下，温度的升高加速了As从含水层沉积物中的释放。升高温度可以通过促进含砷Fe（hydr）氧化物的溶解、含砷硅酸盐的风化以及As从沉积物中解吸到地下水中来刺激As的释放。研究结果不仅可以加深对地热地质背景下地下水中砷富集机制的认识，还可以为世界上其他具有类似地质背景的高砷地下水提供科学依据。

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来源期刊

Applied Geochemistry 地学-地球化学与地球物理

CiteScore

6.10

自引率

8.80%

发文量

272

审稿时长

65 days

期刊介绍： Applied Geochemistry is an international journal devoted to publication of original research papers, rapid research communications and selected review papers in geochemistry and urban geochemistry which have some practical application to an aspect of human endeavour, such as the preservation of the environment, health, waste disposal and the search for resources. Papers on applications of inorganic, organic and isotope geochemistry and geochemical processes are therefore welcome provided they meet the main criterion. Spatial and temporal monitoring case studies are only of interest to our international readership if they present new ideas of broad application. Topics covered include: (1) Environmental geochemistry (including natural and anthropogenic aspects, and protection and remediation strategies); (2) Hydrogeochemistry (surface and groundwater); (3) Medical (urban) geochemistry; (4) The search for energy resources (in particular unconventional oil and gas or emerging metal resources); (5) Energy exploitation (in particular geothermal energy and CCS); (6) Upgrading of energy and mineral resources where there is a direct geochemical application; and (7) Waste disposal, including nuclear waste disposal.