矿区河流中氟化物的多源贡献量计算及环境背景值确定

环境背景值反映了环境质量的原始状态，是确定区域环境污染程度的基础，在环境质量评价、政府决策中起着十分重要的作用。对于具有矿产背景的区域，由于其水文地质环境复杂，传统背景值的计算方法存在局限性。笔者以明白河流域为研究对象，利用水文分析工具，结合实际采样检测，将流域内氟化物的来源分为4类，单独进行估算，并利用研究区出境断面处的多年历史数据对估算结果进行验证，预测精度达到89.4%；最后只考虑自然因素对总量的贡献，计算出河流中氟化物的背景值为1.72 mg/L。

Calculation of Contribution of Fluoride from Different Sources and Determination of Environmental Background Value in River of Mining Area

Environmental background value reflects the original state of environmental quality and is the basis for determining the degree of regional environmental pollution.It plays a very important role in environmental quality evaluation and government decision-making.For the region with mineral background,the traditional calculation method of background value has limitations due to the complexity of its hydrogeological environment.This paper takes the Ming-bai River basin as the research area,uses the hydrologic analysis tool,and combines the actual sampling test,divides the fluoride sources in the basin into four categories,and estimates them separately,and verifies the estimated results by using the multi-year historical data of the exit section of the study area,and the prediction accuracy reaches 89.4%.Finally,considering only the contribution of natural factors to the total amount,the background value of fluoride in the river is calculated to be 1.72 mg/L.