以研究区高氟、高砷地下水化学指标统计数据为基础, 选取25 组数据, 分析了氟、砷浓度的水化学影响因素, 结果表明: H CO3 - 浓度高的碱性环境中氟、砷浓度较高; 随着Na/ ( Cl+ SO4 ) 比值的增加, 氟离子浓度也呈增加趋 势; 地下水中氟、砷浓度高的区域TDS 含量也较高, 反映出地质环境背景为苏打化地区。对比As3+ 与As5+ 的含量 分布, 分析As3+ 与E As 散点图, 得到含水层中As3+ 与As5+ 的分布规律, 即高砷水集中在承压含水层, 含水层中超 标砷离子主要为As5+ 。

Based on the stat istical dat a o f hydro chemical index es of high2fluo rine and high2arsenic gr oundwater in the study area, 25 g r oups of data wer e selected to identify t he hydro chemical impact facto rs on the f luor ine and ar senic concent ratio ns. The re2 sults show ed that fluo rine and ar senic concentr ations are hig h in the alkaline env iro nment w ith high HCO3 - concentr atio n, flu2 o ride concent ratio n incr eases w ith the increasing of Na / ( Cl + SO4 ) r atio , and TDS in hig h2fluor ine and hig h2a rsenic g roundw a2 ter is also high, indicating the so da process o f the geo log ical setting in the study ar ea. Compared w ith the concentr atio n distribu2 tions of As3+ and As5+ , the analysis o f As3+ and 2 As scatt er plot show ed the distributio n As3+ and As5+ in g ro undwater , w hich sug gested that hig h2arsenic water is mainly in the co nfined aquifer and the main o ver2 standard arsenic ion is As5+ 。

中国地质调查局国土资源大调查项目/ 东北地方病严重区地下水勘查及供水安全示范工程0 ( 1212010634701)