渭南市湿沉降汞的时间分布特征及其来源探究

Temporal distribution and sources of wet deposition mercury in Weinan city

为了研究渭南市降水中总汞的时间分布特征,于2014年11月-2015年12月对渭南市41场降水样品进行了采集,检测了其pH、电导率及总汞浓度,分析了总汞浓度与降水量、大气传输等的关系。结果表明,研究时段内,总汞的年沉降量为1823.33ng/m^2,季节变化趋势为春季>夏季>秋季>冬季,总汞平均浓度值为7.40ng/L,季节变化趋势为冬季>秋季>夏季>春季。渭南市降雨中的汞浓度主要受降雨量及燃煤和交通排放等人为活动的影响。

To investigate the tempo -spatial distribution of total mercury in precipitation in Weinan city, 41 samples of precipitation were collected from November 2014 to December 2015. The total mercury concentration and its relationship with precipitation and atmospheric transmission were analyzed. Results showed that the annual variation of deposition fluxes of total mercury was 1823.33ng/m^2 ; the seasonal deposition fluxes ranked as spring 〉 summer 〉 autumn 〉 winter. The average concentration of total mercury was 7.40ng/L; the seasonal concentration amount ranked as winter 〉 autumn 〉 summer 〉 spring. Mercury concentration amount in the precipitation was mainly affected by the amount of rainfall, coal combustion, transportation emissions and other human activities.