江汉平原砷中毒病区地下水砷形态季节性变化特征

邓娅敏; 王焰新; 李慧娟; 李红梅; 郭伟; 段艳华; 董创举; 甘义群; 刘乃静; 丁旭峰

doi:10.3799/dqkx.2015.168

江汉平原砷中毒病区地下水砷形态季节性变化特征

doi: 10.3799/dqkx.2015.168

邓娅敏¹,
王焰新^{2, 3, ,},
李慧娟^{1, 4},
李红梅¹,
郭伟³,
段艳华²,
董创举¹,
甘义群^{2, 3},
刘乃静¹,
丁旭峰^{1, 4}

1.
中国地质大学地质调查研究院, 湖北武汉430074
2.
中国地质大学环境学院, 湖北武汉 430074
3.
中国地质大学生物地质与环境地质国家重点实验室, 湖北武汉 430074
4.
湖北省地质环境总站, 湖北武汉 430034

基金项目:

国家自然科学基金项目 41102153

国家自然科学基金项目 41120124003

国家自然科学基金项目 41472217

中央高校基本科研业务费专项基金 CUGL140412

中央高校基本科研业务费专项基金 CUG120113

中国地调局地质调查子项目 12120114069301

科技部国合项目 2014DFA20720

详细信息

通讯作者:
王焰新, E-mail: yx.wang@cug.edu.cn

中图分类号: P641.69
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- 被引次数: 0
出版历程
- 收稿日期: 2015-01-26
- 刊出日期: 2015-11-15

Seasonal Variation of Arsenic Speciation in Shallow Groundwater from Endemic Arsenicosis Area in Jianghan Plain

Deng Yamin¹,
Wang Yanxin^{2, 3
, ,},
Li Huijuan^{1, 4},
Li Hongmei¹,
Guo Wei³,
Duan Yanhua²,
Dong Chuangju¹,
Gan Yiqun^{2, 3},
Liu Naijing¹,
Ding Xufeng^{1, 4}

1.
Geological Survey, China University of Geosciences, Wuhan430074, China
2.
School of Environmental Studies, China University of Geosciences, Wuhan430074, China
3.
State Key Laboratory of Biogeology and Environmental Geology, China University of Geosciences, Wuhan430074, China
4.
Hubei Province Geological Environment Terminus, Wuhan430034, China

摘要

摘要: 查明地下水中砷的时间变异性规律及机理是高砷地下水研究的难点和热点, 也是防控地下水砷污染的根本.选择在雨季前后对浅层潜水和孔隙承压水进行了动态监测.研究表明地下水砷含量和形态与地下水位波动存在明显的响应关系: 雨季开始后随着地下水位抬升, 地下水还原环境增强, As(Ⅴ)和Asp转化成As(Ⅲ), 颗粒态铁大幅降低, 导致水中溶解的砷和铁大幅增加, 地下水砷含量在雨季达到最高且As(Ⅲ)所占比例达到90%;雨季结束后随着水位逐渐降低, 地下水中As(Ⅲ)所占比例和溶解的砷含量下降.农业活动对浅层潜水砷形态季节性变化有明显的影响.孔隙承压水的砷形态分布变化较浅层潜水幅度大, 其变化与水位波动存在滞后效应.自然或人为活动引起的地下水位季节性变化改变了含水层的氧化还原环境, 补给水源与地下水之间的混合过程带来新的物质输入促进地下水系统中砷的迁移转化.
- 砷形态 /
- 季节性变化 /
- 水位波动 /
- 氧化还原 /
- 江汉平原 /
- 地下水 /
- 地球化学.
Abstract: Understanding the seasonal variation of arsenic occurrence in shallow groundwater system is one of the challenges and hot spots concerning the research on high arsenic groundwater, which plays an important role in evaluation of safe groundwater availability and remediation of arsenic-affected aquifer. To investigate the seasonal variation of arsenic speciation in the shallow aquifer from the endemic arsenicosis area in the Jianghan plain, groundwater from shallow phreatic aquifer and unconfined aquifer were monitored for arsenic speciation (As(Ⅲ), As(Ⅴ) and acid-leacheable particulate As) and water level during pre-monsoon (May), monsoon (July-August) and post-monsoon (November-December) seasons. Arsenic concentration and speciation in groundwater varied temporally: the concentration of As(Ⅴ) and particulate As were higher, together with higher particulate Fe in most samples during the pre-monsoon seasons; As(Ⅴ) and particulate As decreased significantly during monsoon seasons, while dissovled As and Fe increased dramatically. Higher As concentrations were associated with an increasing percentage of As(Ⅲ) in rainy season and a decrease towards the end of dry season, indicating a reductive moblization responding to groundwater level fluctuation.
- arsenic speciation /
- seasonal variation /
- water level fluctuation /
- redox /
- Jianghan plain /
- groundwater /
- geochemistry.

HTML全文

图 1 江汉平原高砷地下水监测场位置及监测井结构分布

Fig. 1. Distribution and structure of monitoring wells in high arsenic groundwater field monitoring site of Jianghan plain

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图 2 高砷地下水监测场水文地质剖面

Fig. 2. Hydrogeological profile in high arsenic groundwater field monitoring site

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图 3 不同深度地下水砷含量季节性变化与降雨量、水位波动的响应关系

降雨量数据来源于仙桃市气象局

Fig. 3. Seasonal variation of arsenic concentration in groundwater at different depths responding to fluctuation of water level and precipitation change

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图 4 监测场5月和7月浅层潜水与孔隙承压水中砷形态分布特征对比

Fig. 4. Comparison of arsenic speciation distribution in shallow phreatic aquifer and confined aquifer in May and July at field monitoring site

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图 5 监测场浅层潜水与孔隙承压水不同季节砷形态分布

图例同图 4

Fig. 5. Comparison of arsenic speciation distribution in shallow phreatic aquifer and confined aquifer in different months at field monitoring site

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图 6 监测场浅层潜水与孔隙承压水的氧化还原环境与As(Ⅲ)比例、铁浓度变化在雨季前后的对比

Fig. 6. Comparison of redox environment change and seasonal variation of As(Ⅲ) percentage and iron concentration in shallow phreatic aquifer and confined aquifer from pre-monsoon to post-monsoon

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图 7 监测场浅层潜水与孔隙承压水颗粒态铁含量在雨季前后变化

Fig. 7. Comparison of particulate iron in shallow phreatic aquifer and confined aquifer in different months at field monitoring site

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表 1 江汉平原高砷地下水监测场剖面不同深度含水层水位季节性变化统计

Table 1. Seasonal variations of water level at different depths at monitoring field site (SY01-SY05)

监测点编号	全新统浅层孔隙潜水水位(m)			下中更新统孔隙承压水水位(m)
监测点编号	丰水期	枯水期	水位变幅	丰水期	枯水期	水位变幅
SY01	22.12	21.38	0.74	22.26	21.00	1.26
SY02	22.24	20.77	1.47	22.06	20.84	1.22
SY03	22.17	21.67	0.50	21.94	20.87	1.07
SY04	22.04	21.66	0.38	21.67	20.64	1.03
SY05	22.18	21.53	0.65	21.56	20.58	0.98

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表 2 地下水砷形态分析的HPLC-HG-AFS条件

Table 2. Experimental condition for determination of arsenic speciation with HPLC-HG-AFS

HPLC				HG-AFS
色谱柱	保护柱	流动相	进样体积	还原剂	负高压	载气
Hamilton PRP-X100(250 mm×4.1 mm i.d., 10 μm)	Hamilton PRP-X100(25 mm×2.3 mm i.d., 12~20 μm)	15 mmol/L(NH₄)₂HPO₄，pH=6.00，流速1.0 mL/min	20 μL	1.5% NaBH₄+0.5% NaOH	300 V	450 mL/min
Hamilton PRP-X100(250 mm×4.1 mm i.d., 10 μm)	Hamilton PRP-X100(25 mm×2.3 mm i.d., 12~20 μm)	15 mmol/L(NH₄)₂HPO₄，pH=6.00，流速1.0 mL/min	20 μL	载流7% HCl	灯电流50 mA	屏蔽气/min

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表 3 监测场内不同深度监测井中溶解性有机碳的季节性变化

Table 3. Seasonal variation of dissolved organic matter in different aquifers from Jianghan plain

监测点编号	A井DOC含量(mg/L)			B井DOC含量(mg/L)
监测点编号	2013-05	2013-08	2013-11	2013-05	2013-08	2013-11
SY03	12.34	18.25	6.54	3.75	13.84	3.27
SY05	11.01	13.98	13.54	8.11	13.49	3.03
SY07	8.08	17.64	4.47	3.84	4.67	3.44

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