WANG Yuanwei1,2，QIAN Jianping1,2， MO Fujin1,2， ZHANG Li1,2
(1.Guangxi Scientific Experiment Center of Mining, Metallurgy and Environment, Guilin University of Technology Guilin 541004, China;
2.College of Earth Science, Guilin University of Technology, Guilin 541004, China)
Abstract: In this paper mercury distribution of soil and plants (overlord grass) in Yulan mercury pithead district and surrounding areas, Lamoin Guangxi Province, China were investigated to understand the status of mercury pollution in soil and overlord grass and the transition and transform rule of mercury in soil-overlord grass system, and then to provide a scientific basis for mercury pollution prevention and restoration. In this study 315 soil samples and 150 plants (overlord grass) samples were collected. All samples were treated by using MDS - 2003f type pressure control closed microwave digestion system, and analysis and determine by using atomic fluorescence mercury meter. Results show that mercury content of soil in Pit area is 1.3621±1.2276 μg/g, and mercury content in soil in Lamo area is 0.7428±0.717 μg/g, and the mercury content of soil in surrounding area is 0.3464±0.0313 μg/g, 19.18, 10.46, 4.88 times the natural content of the soil mercury (0.071 μg/g), respectively. As far away from the mining area in the middle of the soil mercury levels in turn spread out on both sides. The characteristics of mercury distribution in plants are similar to soil mercury distribution; the correlation between mercury in plant root and leaves and soil mercury are r = 0.547 and r = 0.179, respectively, higher than the critical value r = 0.159 (the trust degree of α=5%). Mercury content in different parts of plants shows the order of root > leaf > stem, indicating that soil is the main source for mercury in plants. Mercury in plant roots on soil mercury enrichment coefficient is 3%, the levels of absorb state is low on soil. Plant root and stem hub transfer coefficients are higher, being 36.62% and 65.91% respectively, indicating that most of effective state of mercury absorbed by plants root is transferred to the stem leaf.
Keywords: Yulan mercury； soil；overlord grass； mercury content； pollution assessment
EARTH AND ENVIRONMENT Vol.44, No.6 Tot No.314, 2016, Page 605-612
