桂林市七星区土壤汞赋存形式及其污染性研究

Occurrence phases and pollution characteristics of mercury in soil of Qixing District of Guilin City

文章对桂林市七星区五个采样片区的土壤热释汞含量、部分样品汞的赋存形式以及其污染性状进行了分析,并对主要相态汞的来源进行了简单的分析。结果发现:桂林市七星区部分区段土壤汞存在轻度的污染,污染主要源于原始岩石背景含量较高;区内土壤中汞的赋存方式多种多样,组成差异也较大,其中以硫酸汞为主的高温热态汞含量最高,其次为硫化物形态汞,再次为以氧化物形态为主的中温热态汞,而吸附态汞和低温热态亚汞及低温热态汞含量较低,所占总汞含量小于10%。

This paper conducted an analysis on the heat-released mercury content,occurrence phases and their pollution characteristics,as same as the source of main mercury phases,in the soil from five sampling areas of Qixing District of Guilin.It is found that the mercury in soil in some parts of Qixing District of Guilin has light pollution which is caused by original background of rock.There are multi-phases and large differences in content of mercury in soil in research areas,and among them,the content of mercury in high-temperature release state mainly as mercury sulfate is the highest,and that in sulfides is the second highest.The content of mercury in medium-temperature release state mainly as mercury oxide is the third highest,but the content of mercury in adsorbed state as well as that of mercury in low-temperature release state are relatively lower than 10% of the total mercury.