The Evaluation of Hg Ecological Geochemistry of Surface Soil in Lanzhou

详细信息   

• 责任者：Liu Wenhui (Gansu Institute of Geological Survey ; Lanzhou 730000 ; China) ; Li Chunliang
• 刊名：Geophysical and Geochemical Exploration
• 出版年：2012
• 卷期：36(5)
• 关键词：土壤污染 ; soil pollution ; 汞 ; mercury ; 甘肃 ; Gansu Province
• 页码：p.869-873
• 图表：2 illus., 6 tables, 9 refs.
• 分类号：1800
• issnNo：ISSN1000-8918
• isbnNo：CN11-1906/P

摘要

Based on analyzing the spatial distribution patterns of surface soil and atmospheric （ dry and wet） deposition of Lanzhou cov- ering 1 663 km2, the authors concluded that the average content of Hg in surface soil is 0.14 × 10^ -6 with the peak value being 6.38× 10^-6, and that burning coal is the main source of Hg in surface soil. The annual mean value of total Hg content in air of Lanzhou is 28.62× 10^ -9 ,whereas the value during the heating period and non-heating period is 48.48 × 10^ -9 and 9.42 × 10^-9 ,respectively. Ac- cording to the National Environmental Quality Standards for Soil , the area of Grade I Hg quality in surface soil of Lanzhou reaches 1 376.1 km2, while Grade Ⅱ , Ⅲ, Ⅳ possesses 246.8 km2, 31.7 km2 and 8.4 km2 respectively. The area of Grade Ⅰ accounts for 82.75% of the whole study area, while the percentage for Grade Ⅱ , Ⅲ, Ⅳ is 14.84% ,1.91% and 0.51%, respectively. It is found that the areas of Grade Ⅲ and Ⅳ are mainly distributed around the Petrochemical Plant of Xigu District and Lanzhou Second Heat and Power Factory in Chengguan and Qilihe districts.