酒泉东盆地地下水“三氮”分布特征及健康风险分析

DISTRIBUTION CHARACTERISTICS AND INFLUENCING FACTORS OF THREE SOLUBLE NITROGENOUS MATERIAL OF GROUNDWATER IN EAST JIUQUAN BASIN

为探讨河西走廊地下水“三氮”的污染现状和个人健康风险。本文以酒泉东盆地为例,通过数据统计、空间分布趋势、污染源和影响因素分析的手段,从“三氮”分布、迁移和影响因素及其健康风险评价进行研究。结果表明:在其独特的地形地貌、氧化还原环境、包气带和含水层岩性、潜水的埋深、酸碱环境和地下径流条件等自然因素以及生态环境的破坏和城市化的发展等人为因素影响下,研究区地下水“三氮”总体含量较低,污染相对较轻,仅有一处NO_(3)^(-)-N含量超过标准限值;区域分布上,“三氮”含量具有明显的北高南低的规律,NO_(3)^(-)-N和NO_(2)^(-)-N含量东、西两侧高,中间低,NH_(4)^(+)-N含量由西北向东南逐渐减少。“三氮”个人年健康风险的整体分布趋势基本一致,由西部人口密集区域向东部人口非密集区域逐渐递减。

In order to investigate the pollution status and personal health risk of groundwater,the paper taking East Jiuquan Basin as an example,studies the distribution,migration,influencing factors and health risk assessment of three nitrogen by means of data statistics,spatial distribution trend,pollution sources and influencing factors analysis.The results show that:under the influence of the unique landscape,geomorphology,redox environment,the aeration zone and aquifer lithology,diving depth,acid and alkali environment and underground runoff of natural factors,as well as the destruction of the ecological environment and the development of urbanization,the overall content of“three nitrogen”in groundwater is low,and the pollution is relatively light,only a NO_(3)^(-)-N content exceed the standard limit;on the regionally distribution,In terms of regional distribution,the content of“three nitrogen”has an obvious pattern of high in the north and low in the south,The content of NO_(3)^(-)-N and NO_(2)^(-)-N is high in the east and west,and low in the middle,The content of NH_(4)^(+)-N gradually decreases from northwest to southeast.The overall distribution trend of personal annual health risk of“three nitrogen”was consistent,and the risk gradually decreased from the densely populated area in the west of the study area to the non-densely populated area in the east.