某金矿区农田土壤汞污染评价

混汞法提金工艺过程中添加的金属汞是某金矿区周围环境汞污染的主要来源。从农田土壤耕作层总汞调查表明，汞含量范围在0．04～61．20mg／kg，均值为1．98mg／kg；超过二级土壤环境质量标准的样品达36．20％，最大超标倍数为60．2，平均超标倍数为3．61，受到轻度以上污染的农田面积比率达69.7％；与相邻区域表层土壤值相比，汞累积超标率93．1％。因此，某金矿区农田土壤已经受到汞金属的严重污染。

Assessment on mercury contamination to agricultural soil in the gold mine area

Mercury, that was used to extract gold in amalgamation, is the main source of pollution of the mine environment. A disquisition on cropland mercuric contamination by 116 samples indicates that mercuric values change from 0.04 to 61.20mg/kg with its average of 1.98mg/kg. In these samples, 36.20% of them are beyond the standards, with the maximum being is 60.2 times and an average 3.61 time of the standard value, which makes the lightly and above contaminated area be 69.7% of the total area. Compared with adjacent farming soil values, 93.1% of the total samples is be in excess of normal. The cropland soil has been seriously contaminated by mercury in gold mine area.