北京潮白河中下游第四系沉积物还原性无机硫分布特征及其影响因素

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摘要基于岩芯采样、室内连续分级提取,沉积物、地下水关联分析,以及水体矿物饱和度指数(SI)等,探究潮白河中下游地区第四系沉积物还原性无机硫(RIS)含量分布、赋存形态及影响因素.结果表明:研究区域第四系沉积物RIS各组分含量自高到低分别为黄铁矿硫(CRS)>单质硫(ES)>酸可挥发性硫化物(AVS),CRS、ES和AVS含量分别占RIS的80.1%、13.4%和5.56%,67%的点位CRS/AVS>3.中上游地区沉积物中RIS含量低于下游,四个含水层中RIS含量自浅向深分别为84.3,37.4,39.1和10.5mg/kg,整体呈降低趋势.RDA和相关性分析结果显示,沉积物TOC含量、CRS/AVS值、含水率是影响研究区域RIS含量和赋存形态的重要因素,前者同时受地下水pH值、铁/硫比,以及水文地质条件的影响,后者同时受地下水COD_Mn和ORP值的影响.地下水中FeS的SI值在零值附近浮动,FeS₂的SI>0.研究区域沉积物中RIS基本不受人为扰动影响,硫化物活性和生物有效性低,沉积物主要通过AVS沉淀/溶解以及ES歧化反应影响地下水中SO₄^2-、硫化物、Fe、As的浓度水平.

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	陈吉吉
	荆红卫
	沈秀娥
	郭婧
	杨庆
	席玥
	徐蘇士
	郭华明
	高志鹏
	陶蕾

关键词 ：还原性无机硫, 空间分布, 赋存形态, 第四系沉积物, 地下水, 潮白河冲洪积扇

Abstract：Based on core sampling, sequential extraction procedure in the laboratory, correlation analysis between sediments and groundwater, and mineral saturation index (SI) of groundwater, this paper explored the distribution, form and influencing factors of RIS in Quaternary sediments in the middle and lower reaches of Chaobai alluvial-proluvial fan, in Beijing. Results showed that the content of RIS in the study area followed a descending order of: Pyrite-S (CRS) > essential sulfur (ES) > acid volatile sulfide (AVS), among which CRS accounting for 80.1%, ES and AVS accounting for 13.4% and 5.56% respectively. 67% of samples had CRS/AVS value higher than 3. The RIS content in sediments in the upper reaches was lower than that in the lower reaches, and RIS contents in the four aquifers from shallow to deep were 84.3, 37.4, 39.1 and 10.5mg/kg respectively, showing an overall decreasing trend. The results of RDA and correlation analysis indicated that the TOC content, CRS/AVS value and water content in sediments were crucial factors affecting the content and form of RIS in the study area. Specifically, the content of RIS was also affected by the groundwater pH value, iron/sulfur ratio and hydrogeological conditions, and the form of RIS was affected by the COD_Mn and ORP of groundwater. The SI value of FeS in groundwater fluctuated around 0, and the SI value of FeS₂>0. In summary, RIS in the sediments of the study area is basically unaffected by human disturbance, and the activity and bioavailability of sulfide are low. The sediments may affect the concentrations of sulfate, sulfide, iron and arsenic in groundwater mainly through AVS precipitation/dissolution and ES disproportionation reaction.

Key words： reduced inorganic sulfur spatial distribution form Quaternary sediment groundwater Chaobai alluvial-proluvial fan

收稿日期: 2024-10-09

PACS:	X523
	P641

基金资助:北京市平原区地下水环境背景值调查研究项目;国家重点研发计划(2021YFC1809000)

作者简介: 陈吉吉(1989-),女,陕西商洛人,高级工程师,博士,主要研究方向为地下水环境监测.发表论文10余篇.cateapple@163.com.

引用本文:

陈吉吉, 荆红卫, 沈秀娥, 郭婧, 杨庆, 席玥, 徐蘇士, 郭华明, 高志鹏, 陶蕾. 北京潮白河中下游第四系沉积物还原性无机硫分布特征及其影响因素[J]. 中国环境科学, 2025, 45(5): 2735-2744. CHEN Ji-ji, JING Hong-wei, SHEN Xiu-e, GUO Jing, YANG Qing, XI Yue, XU Su-shi, GUO Hua-ming, GAO Zhi-peng, TAO Lei. Distribution characteristics and influencing factors of RIS in Quaternary sediments in the middle and lower reaches of Chaobai alluvial-proluvial fan, in Beijing. CHINA ENVIRONMENTAL SCIENCECE, 2025, 45(5): 2735-2744.

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