珠江三角洲地区地下水氟元素背景特征分析  

The background features of fluoride in groundwater of Pearl River Delta

作　　者：张英[1] 张玉玺[1] 王金翠[1] 孙继朝[1] 

机构地区：[1]中国地质科学院水文地质环境地质研究所,石家庄050061

出　　处：《环境化学》2013年第10期1983-1988,共6页Environmental Chemistry

基　　金：中国地质调查局项目(1212011220982)资助

摘　　要：利用珠江三角洲地区1∶25万区域地下水样点数据资料,采用数理统计方法,在判断元素含量分布类型的基础上,计算该地区氟的背景集中特征值和背景范围,并对背景值统计特征及分布规律进行分析.分析认为,浅层地下水受人类活动影响较大,多呈现偏态分布;氟背景含量范围主要集中在<0.05—0.59 mg·L-1基本低于世界卫生组织(WHO)水质标准1.5 mg·L-1,相对高背景区主要集中在三角洲冲积平原区,山地丘陵区相对贫乏,其分布主要受上覆岩土性质、含水层岩性、地下水径流条件、酸碱条件的影响.另外,沿海地带氟含量受海水入侵作用影响明显;深层地下水高值异常,氟含量范围在1.6—4.0 mg·L-1区与断裂构造带和温泉分布关系密切.The natural background levels and ranges of fluoride in groundwater of Pearl River Delta were calculated with the Mathematical Statistics Method based on regional groundwater samples scaled by 1：250000 and the regularity of statistics and distribution of the fluoride contents were also analyzed in this paper. The distribution patterns of shallow groundwater are shown to be skewed, mainly caused by anthropogenic activities. The contents of fluoride ranges from 〈 0.05 to 0.59 mg- L- 1, which are lower than 1.5 mg- L- 1, according to the standard of WHO water quality. The relatively high natural background levels are mainly distributed in the delta alluvial plains, while the relatively lower level distributed in the hilly areas. The nature of the upper soils and the aquifer lithology, the conditions of groundwater runoff, alkalinity as well as seawater intrusion in coastal areas may contribute to the distribution of fluoride in groundwater. The occurrence of high value outliers ranging from 1.6 to 4.0 mg. L-1 is closely related to fault zones and emergence of thermal springs in deep groundwater. This study provides a scientific evidence for management of water resources and prevention for endemic diseases in Pearl River Delta.

关 键 词：环境背景值 氟元素 地下水 珠江三角洲 

分 类 号：X832[环境科学与工程—环境工程]