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| THE EVALUATION OF Hg ECOLOGICAL GEOCHEMISTRY OF SURFACE SOIL IN LANZHOU |
| LIU Wen-hui, LI Chun-liang, WU Yong-qiang, WANG Xi-li |
| Gansu Institute of Geological Survey, Lanzhou 730000, China |
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Abstract Based on analyzing the spatial distribution patterns of surface soil and atmospheric (dry and wet) deposition of Lanzhou covering 1663 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 1376.1 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 GradeⅡ,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.
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Received: 05 July 2011
Published: 10 October 2012
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