松嫩平原含水层沉积物特征及其对砷赋存态分布的影响
松嫩平原西部地区为中国砷中毒区域,含水层沉积物特征及砷赋存态对地下水砷迁移、转化的影响并不清楚。在对研究区高砷区与低砷区钻孔沉积物进行取样的基础上,运用激光粒度分析、Tessier五步提取法和Keon分步提取法分别确定了不同深度沉积物的粒度分布和不同赋存态砷含量,系统研究了沉积物的水力传导系数、不同赋存态砷的分布及其与高砷地下水形成的关系。结果表明：沉积物5种赋存态砷（包括可交换态、碳酸盐吸附态、铁/锰氧化物吸附态、有机物或硫化物吸附态和基质态）中,铁/锰氧化物吸附态砷含量最高,并且砷含量与铁、锰含量呈明显正相关性;高砷区钻孔沉积物铁/锰氧化物吸附态砷质量分数为（1.18~6.11）×10^-...
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| Published in | 地球科学与环境学报 Vol. 37; no. 1; pp. 101 - 110 |
|---|---|
| Main Author | |
| Format | Journal Article |
| Language | Chinese |
| Published |
中国地质大学 北京 地下水循环与环境演化教育部重点实验室，北京 100083
2015
中国地质大学 北京 水资源与环境学院，北京 100083 |
| Subjects | |
| Online Access | Get full text |
| ISSN | 1672-6561 |
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| Abstract | 松嫩平原西部地区为中国砷中毒区域,含水层沉积物特征及砷赋存态对地下水砷迁移、转化的影响并不清楚。在对研究区高砷区与低砷区钻孔沉积物进行取样的基础上,运用激光粒度分析、Tessier五步提取法和Keon分步提取法分别确定了不同深度沉积物的粒度分布和不同赋存态砷含量,系统研究了沉积物的水力传导系数、不同赋存态砷的分布及其与高砷地下水形成的关系。结果表明：沉积物5种赋存态砷（包括可交换态、碳酸盐吸附态、铁/锰氧化物吸附态、有机物或硫化物吸附态和基质态）中,铁/锰氧化物吸附态砷含量最高,并且砷含量与铁、锰含量呈明显正相关性;高砷区钻孔沉积物铁/锰氧化物吸附态砷质量分数为（1.18~6.11）×10^-6,低砷区为（0.67-2.60）×10^-6;高砷区钻孔沉积物以粉砂、黏土为主,水力传导系数介于0.004-0.027m·d^-1,低砷区钻孔沉积物以细砂、中砂为主,水力传导系数介于0.005-0.2m·d^-1;沉积物中粉砂或黏土含量越多,则沉积物颗粒越小,其水力传导系数越低,各赋存态砷含量越高,因此,高砷区低水力传导系数有利于还原环境的形成。通过地下水的循环,高砷含水层沉积物的淋滤作用和铁/锰氧化物的还原性溶解形成了研究区高砷地下水。 |
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| AbstractList | P641.3; 松嫩平原西部地区为中国砷中毒区域,含水层沉积物特征及砷赋存态对地下水砷迁移、转化的影响并不清楚.在对研究区高砷区与低砷区钻孔沉积物进行取样的基础上,运用激光粒度分析、Tessier五步提取法和Keon分步提取法分别确定了不同深度沉积物的粒度分布和不同赋存态砷含量,系统研究了沉积物的水力传导系数、不同赋存态砷的分布及其与高砷地下水形成的关系.结果表明：沉积物5种赋存态砷(包括可交换态、碳酸盐吸附态、铁/锰氧化物吸附态、有机物或硫化物吸附态和基质态)中,铁/锰氧化物吸附态砷含量最高,并且砷含量与铁、锰含量呈明显正相关性；高砷区钻孔沉积物铁/锰氧化物吸附态砷质量分数为(1．18~6．11)×10－6,低砷区为(0．67~2??60)×10－6；高砷区钻孔沉积物以粉砂、黏土为主,水力传导系数介于0．004~0．027 m?d－1,低砷区钻孔沉积物以细砂、中砂为主,水力传导系数介于0．005~0．2 m?d－1；沉积物中粉砂或黏土含量越多,则沉积物颗粒越小,其水力传导系数越低,各赋存态砷含量越高,因此,高砷区低水力传导系数有利于还原环境的形成.通过地下水的循环,高砷含水层沉积物的淋滤作用和铁/锰氧化物的还原性溶解形成了研究区高砷地下水. 松嫩平原西部地区为中国砷中毒区域,含水层沉积物特征及砷赋存态对地下水砷迁移、转化的影响并不清楚。在对研究区高砷区与低砷区钻孔沉积物进行取样的基础上,运用激光粒度分析、Tessier五步提取法和Keon分步提取法分别确定了不同深度沉积物的粒度分布和不同赋存态砷含量,系统研究了沉积物的水力传导系数、不同赋存态砷的分布及其与高砷地下水形成的关系。结果表明：沉积物5种赋存态砷（包括可交换态、碳酸盐吸附态、铁/锰氧化物吸附态、有机物或硫化物吸附态和基质态）中,铁/锰氧化物吸附态砷含量最高,并且砷含量与铁、锰含量呈明显正相关性;高砷区钻孔沉积物铁/锰氧化物吸附态砷质量分数为（1.18~6.11）×10^-6,低砷区为（0.67-2.60）×10^-6;高砷区钻孔沉积物以粉砂、黏土为主,水力传导系数介于0.004-0.027m·d^-1,低砷区钻孔沉积物以细砂、中砂为主,水力传导系数介于0.005-0.2m·d^-1;沉积物中粉砂或黏土含量越多,则沉积物颗粒越小,其水力传导系数越低,各赋存态砷含量越高,因此,高砷区低水力传导系数有利于还原环境的形成。通过地下水的循环,高砷含水层沉积物的淋滤作用和铁/锰氧化物的还原性溶解形成了研究区高砷地下水。 |
| Abstract_FL | The western Songnen Basin is one of typical arsenic poisoning regions in China. However,the effects of sediment characteristics and arsenic occurrence modes on groundwater arsenic migration are still unknown.Based on sediment sampling from boreholes with high or low contents of arsenic,particle size distributions and contents of different arsenic occurrence modes of sediments in different depths were analyzed by laser particle size analyzer,Tessier five-step extraction method and Keon step-by-step extraction method.The roles of hydraulic conductivity coefficient and distribution of different arsenic occurrence modes of sediments in forming groundwater with high content of arsenic were investigated.The results show that content of Fe/Mn oxide absorbed arsenic,which has significantly positive correlation with contents of Fe and Mn,is the highest among the five arsenic occurrence modes including exchangeable,carbonate absorbed,Fe/Mn oxide absorbed,organic or sulfide absorbed and metrical modes;mass fractions of Fe/Mn oxide absorbed arsenics are (1.18-6.11)× 10-6 and (0.67-2.60)× 10-6 for the sediments from boreholes in the area with high or low contents of arsenic;the sediments from boreholes in the area with high content of arsenic are mainly silt and clay with the hydraulic conductivity coefficient of 0.004-0.027 m??d-1 ,and the sediments in the area with low content of arsenic are fine and medium sands with the hydraulic conductivity coefficient of 0.005-0.2 m??d-1;sediments with higher contents of silt or clay have lower hydraulic conductivity coefficient and higher contents of different arsenic occurrence modes, therefore, low hydraulic conductivity coefficient is in favour of the formation of reducing environment in the area with high content of arsenic.Because of the groundwater circulation,leaching of sediments and reductive dissolution of Fe/Mn oxides in aquifer with high content of arsenic contribute to the formation of groundwater with high content of arsenic. |
| Author | 李付兰 倪萍 郭华明 曹永生 张迪 |
| AuthorAffiliation | 中国地质大学（北京）地下水循环与环境演化教育部重点实验室,北京100083 中国地质大学（北京）水资源与环境学院,北京100083 |
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| Author_FL | GUO Hua-ming ZHANG Di CAO Yong-sheng LI Fu-lan NI Ping |
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| DocumentTitleAlternate | Characteristics of Aquifer Sediments in Songnen Plain and Their Influences on Distribution of Arsenic Occurrence Modes |
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| Keywords | particle size 沉积物 地下水 sequential extraction 赋存态 groundwater arsenic hydraulic conductivity coefficient sediment 砷 水力传导系数 粒度 连续提取 松嫩平原 occurrence mode Songnen Plain |
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| Notes | 61-1423/P groundwater; arsenic; sediment; occurrence mode; particle size; sequential extraction; hydraulic conductivity coefficient; Songnen Plain The western Songnen Basin is one of typical arsenic poisoning regions in China.However,the effects of sediment characteristics and arsenic occurrence modes on groundwater arsenic migration are still unknown.Based on sediment sampling from boreholes with high or low contents of arsenic,particle size distributions and contents of different arsenic occurrence modes of sediments in different depths were analyzed by laser particle size analyzer,Tessier five-step extraction method and Keon step-by-step extraction method.The roles of hydraulic conductivity coefficient and distribution of different arsenic occurrence modes of sediments in forminggroundwater with high content of arsenic were investigated.The results show that content of Fe/Mn oxide absorbed arsenic,which has significantly positive correlation with contents of Fe and Mn,is the highest among the five arsenic oc |
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| PublicationYear | 2015 |
| Publisher | 中国地质大学 北京 地下水循环与环境演化教育部重点实验室，北京 100083 中国地质大学 北京 水资源与环境学院，北京 100083 |
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| Snippet | 松嫩平原西部地区为中国砷中毒区域,含水层沉积物特征及砷赋存态对地下水砷迁移、转化的影响并不清楚。在对研究区高砷区与低砷区钻孔沉积物进行取样的基础上,运用激光粒度分... P641.3; 松嫩平原西部地区为中国砷中毒区域,含水层沉积物特征及砷赋存态对地下水砷迁移、转化的影响并不清楚.在对研究区高砷区与低砷区钻孔沉积物进行取样的基础上,运用激... |
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| SubjectTerms | 地下水 松嫩平原 水力传导系数 沉积物 砷 粒度 赋存态 连续提取 |
| Title | 松嫩平原含水层沉积物特征及其对砷赋存态分布的影响 |
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