沈阳地区地下水化学微量组分动态特征及趋势分析

本文讨论的沈阳地区地下水化学微量组分动态特征及趋势分析,是采用统计分析的方法进行的。统计分析表明,尽管地下水中绝大部分微量组分在各井点中均能检出,但超背景及超标井点的检出率并不高,且主要分布在老城区。大部分微量组分的检出有明显的不均一性,以及重现性差,检出具有较强规律性的有六价铬、镉等少数项,并与地表排污有关。而地下水中微量组分污染的特征是,绝大部分组分呈现出明显的点源污染。作者根据有机污染的指标化学需氧量采用相关分析方法,探讨它与总有机氮和总有机炭的关系,凡有机污染日趋严重的地段,地下水的化学需氧量就愈高。在动态趋势分析上,采用数字模型方法以六价铬为例,进行了单井的预测分析,并在此基础上,提出了控制污染发展的环境管理目标值。

THE TREND ANALYSIS AND THE BEHAVIOUR CHARACTER OF THE CHEMICAL TRACE COMPONENT OF GROUNDWATER IN SHENYANG AREA

Sandy soil are widely spreaded over the surface in Shenyang area with the strong vertical permeability .And with the develop ment of the urban construction, the discharging quantity of polluted water increases with years which leads to the serious pollution of groundwater. In the paper, the trend analysis and the behaviour character of chemical trace component of groundwater in Shenyang area are discussed on the statistical analysis which shows that most of the chemical trace component can be checked up in the monitoring wells, but those over background and over standard values are not high, and mainly in the old urban areas. The checking up of most trace component has obvious characters of no-uniformity and poor reappear. But only a few terms as Cd,Cr~(6 +) have strong regularity,which are related to thedischarge of polluted water. The character of the trace component pollution in groundwater is the point source pollution According to the index chemical oxygen requirment of the organic pollution,the author studies its relation with the total organic carbon and the total organic nitrogen on the relative analysis. As result,the more serious the organic pollution in some sites is,the higher the chemical oxygen requirment in groundwater is On behaviour trend analysis, the author adopts the mathematical model to predict and analyse Cr~(6+) in a monitoring well,and on the base, the environmental management target value of controlling pollution development has been proposed.