泉州市沿海地区地下水锰环境背景值研究

Study on Environmental Background Value of Manganese in Groundwater in Quanzhou Coastal Area

在分析泉州市沿海地区地质背景和水文地质条件的基础上,对研究区进行水文地质单元划分。依据381组浅层地下水化学数据,采用数理统计方法,首次建立了研究区不同水文地质分区地下水锰环境背景值范围。锰环境背景值在空间分布上的差异主要受区域地层岩性中矿物成分锰含量和地下水径流途径长短影响。在锰高含量背景区晋江流域,结合锰环境背景值对地下水进行质量评价,优质水占比83.4%,天然劣质水占比8.3%,劣变水占比8.3%。为进一步合理评价泉州沿海地区地下水水质、地下水污染程度提供科学依据。

On the basis of analyzing the geological background and hydrogeological conditions,Quanzhou coastal area is divided into different hydrogeological units.Based on 381 groups of shallow groundwater chemical data,the environmental background values range of groundwater manganese in different hydrogeological units is established for the first time by using mathematical statistics methods.The difference in the spatial distribution of manganese environmental background values is mainly affected by the manganese content of mineral composition in regional stratigraphic lithology and the length of groundwater runoff path.In the Jinjiang River basin in the high manganese background area,the quality evaluation of groundwater was carried out in combination with the manganese environmental background value.The proportion of high-quality water was 83.4%,the proportion of natural low-quality water was 8.3%,and the proportion of deteriorated water was 8.3%.The results provide scientific basis for further reasonable evaluation of groundwater quality and pollution degree in Quanzhou coastal area.