泰山地区湿沉降中重金属的空间分布

Spatial Variations of Heavy Metals in Precipitation at Mount Taishan Region

为了解泰山地区湿沉降中重金属空间分布特征,于2006-01～2006-12在泰山山上和山下选择2个站点进行降水化学重金属对比分析研究,对68场降水样品用ICP-MS分析测定了Zn、Al、Mn、Fe、Pb、Cu、Ni、Cr、Cd、As等10种重金属.结果表明,山上和山下湿沉降中重金属含量较高,污染显著,元素Zn含量最高,占所有重金属总量的54%～57%,平均浓度分别为92.94μg/L和70.41μg/L,其次为Fe、Al、Mn.有毒重金属中Pb的含量较高,在2个站点降水中浓度分别为8.04μg/L和7.79μg/L.山上与山下湿沉降重金属的时间变化规律以及浓度比较表明,2个站点湿沉降重金属分布特征不同,受各自站点所处大气环境影响显著.站点降水的相关性分析表明,降水中Al、Mn、Fe、As、Cd、Pb等元素受2个站点降水气团影响显著,而Ni、Cu、Zn则可能还受其他因素影响.

Zn, Al, Mn, Fe, Ph, Cu, Ni, Cr, As, Cd in rain samples collected from two sites at Mount Taishan region were determined by ICP- MS, to evaluate the spatial variation characteristics of heavy metals in precipitation. Individual rain events were sampled for one whole year from Jan. to Dec. 2006. High concentrations of heavy metals were found at both sites, indicating serious heavy metal pollution. Zn was the most abundant element, accounting for 54% -57% of the total metals concentrations. Its volume-weighted mean concentrations of precipitation at Mr-top and Mr-foot sites were 92.94 μg,/L and 70.41 μg/L respectively. The following elements were Fe, AI and Mn and their concentrations were much higher than toxic heavy metals （As, Cd and Cd） except Pb （8.04 μg/L and 7.79μg/L at two sites respectively）. Comparison results between two sites suggested that heavy metal characteristics of precipitation at two sites were different, due to the influences of different ambient air conditions. Correlation analysis between two sites showed that Al, Mn, Fe, As, Cd, Pb influenced by air mass origin greatly, while Ni,Cu,Zn affected by other different factors.