摘要
研究了杭州市50个居民小区土壤重金属元素(Cd、Co、Cr、Cu、Ni、Pb、Zn、Mn和Mo)的含量、形态和酸可溶性.结果表明,与农业土壤相比,该市居民区土壤中Cd、Cr、Cu、Ni、Pb、Zn、Mn和Mo均有不同程度的积累;除Cr、Mo外,居民区重金属的积累一般低于该市商业区;土壤重金属元素的积累量随居民区建成时间的增加而增加.居民区土壤中Cd、Co、Cr和Ni主要以稳定的残余态为主;而Cu、Pb、Zn和Mn则以可提取态为主.除Zn、Mn外,重金属的酸可提性组分均较低.土壤重金属的稀酸提取量主要与提取平衡液的pH有关,随pH下降而增加,但大部分土壤中酸可提取的重金属量较低,因此杭州市居民区土壤在正常条件下不会有较多的重金属释放.
The objective of this study was to analyze the concentrations, forms and acid solubility of heavy metals in the soils from fifty residential areas in Hangzhou city. The results showed that the soils in the residential areas had been anthropogenically contaminated by heavy metals to a different extent, and heavy metals in the soils, including Cd, Cr, Cu, Ni, Pb, Zn, Mn, and Mo, were higher than those in the suburban agricultural soils. Except Cr and Mo, however, the metal concentrations of the soils in the residential areas were lower than those of soils in commercial areas. The concentrations of the metals in the soils increased with ages of the residential areas. Cadmium, Co, Cr and Ni were mainly associated with residual fraction, while Cu, Pb, Zn and Mn were majorly extractable fractions. Except for Zn and Mn, the concentrations of the acid extractable metals were generally low. Amounts of the heavy metals dissolved in dilute acid (pH 2.5) increased with decreasing pH in equilibrium solution. Low potential solubility of the heavy metals in the dilute acid was due to their low percentage of acid-extractable fraction of the heavy metals in the soils. Our data indicated that heavy metals of the soils from residential areas in the Hangzhou city did not pose a significant environmental health hazards in normal conditions.
出处
《科技通报》
北大核心
2004年第1期6-10,共5页
Bulletin of Science and Technology
基金
国家自然科学基金资助项目(49601013)
