宁夏吴忠市金积水源地地下水化学特征分析

摘要

Jinji groundwater source field located in Jinji Town,Wuzhong City,Ningxia Hui Autonomous Region is a spare water source of Wuzhong City. 32 groundwater samples and some surface water samples were collected in the secondary reserve area of groundwater field. 109 indexes inclu-ding conventional physical indexes,8 ions,heavy metals,cyanides and organics were tested. The results show that the TDS in groundwater are less than 1000 mg/L,salinity changes from high to low along the groundwater flow direction,the ammonia nitrogen contend is 0. 025-0. 477 mg/L which most of the samples exceed the point content,in some areas the nitrite is also too high,metal ions except Mn,cyanide and organics content are extremely small. Therefore,sewage canal,industrial pollution point and agricultural area source pollution are the main source of local pollution. It is suggested that two sewage canals and enterprises in protection area are abated drastically and agriculture is managed scientifically.%金积水源地位于宁夏吴忠市金积镇，是吴忠市的备用水源地。在水源地二级保护区范围内分丰水、枯水期两次采集了32个地下水水样和部分地表水水样，分析了常规物理指标、八大离子、重金属、多环芳烃、微生物等109项指标。结果表明：研究区地下水中TDS总体小于1000 mg/L，沿地下水流向矿化度由高向低变化；氨氮含量为0．025～0．477 mg/L，大部分采样点含量超标，局部亚硝酸盐含量也比较高；金属离子除锰含量超标外，其他离子含量都正常；氰化物、有机物在地下水中含量极微，未超标。排污沟、工业点源和农业面源是该区主要的污染源，建议在水源地保护区范围内彻底整治两条排污沟和排污企业，并加强对农业面源的管控。