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Evaluation on Heavy Metal Contamination in Some Typical Mine Zone Soils in Hunan Province and Research on Chemical Amelioration of Heavy Metal Contaminated Soils and Soybean Planting

Author: ZhouHang
Tutor: LiaoBaiHan
School: Central South University of Forestry Science and Technology
Course: Environmental Engineering
Keywords: Soils in Mining Areas Pb Cd Zn Soybean Calcium carbonate Hydroxyapatite Chemically modified
CLC: X53
Type: Master's thesis
Year: 2010
Downloads: 146
Quote: 0
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Abstract


Through the soybean planting soil sampling and investigation Hunan typical industrial and mining areas (Chenzhou Shizhuyuan, Guiyang Baoshan, Zhuzhou Qingshuitang and Hengyang Shuikoushan), soybeans and soybean planting soil heavy metal pollution in these areas to make the analysis and evaluation. This study with calcium carbonate and hydroxyapatite the Chenzhou Shizhuyuan the Hengyang Shuikoushan site contaminated soil chemically modified and improved the soil to plant soybeans in the field, both improver for heavy metal contaminated soil Pb, Cd, Zn content of exchangeable impact analysis and comparison of the different modifier dosage of the soybean plant biomass and various organs of the soybean plant of heavy metals accumulation and distribution. The test results are as follows: (1) 21 samples of soil in four industrial and mining areas of Hunan, 11 sampling points for a single CD pollution, the other 10 sampling points for Pb, Cd combined pollution, all sampling points are not subject to Zn pollution. Heavy metal pollution is the most serious of Chenzhou Guiyang Baoshan five sampling points. Soybean Seeds of all sampling points, six sampling points soybean seed by the different levels of Pb, Cd, Zn pollution, the remaining 15 sampling points soybean seed by the serious pollution of Pb, Cd, and over the State Food and pollutant limits. (2) 21 sampling points, soil exchange state Pb, Cd, Zn content of the soybean plant organs three heavy metal content in the basic existence of significant or highly significant linear relationship, which we can measure soil three heavy metal content of exchangeable roughly calculate the three heavy metals content in the various organs of the soybean plants, soybean food safety evaluation. (3) application of calcium carbonate and hydroxyapatite in the Chenzhou Shizhuyuan and the Hengyang Shuikoushan soil can reduce soil in Pb, Cd, Zn exchange state content, and with the increase in the amount of calcium carbonate fertilizer, soil three kinds of heavy metal content of exchangeable fraction was significantly decreased. Application of calcium carbonate and hydroxyapatite improved soybean plant growth conditions in the soil, effectively inhibit the absorption of soybean plant these three heavy metals elements, thereby slowing the toxic effects of heavy metals on soybean plants, soybean plant biomass increased significantly . (4) 2.0 g · kg-1 is the best dosage of calcium carbonate can make the Chenzhou Shizhuyuan soil soybean grain yield 47.5% Pb content in the grain reduced by 73.0%, the Cd content reduced by 53.8%; make Hengyang outlet mountain soil soybean grain yield of 26.4%, grain Pb decreased 51.8%, Cd decreased 47.5%. Hydroxyapatite addition level of 4.0 g · kg-1, can make the Chenzhou Shizhuyuan soil soybean seed yield of 57.8%, grain decreased 52.5% Pb, Cd decreased 13.6%; make Hengyang Shuikoushan soil in soybean seed yield of 23.9%, grain Pb decreased 70.8%, Cd decreased 5.9%. Two heavy metal contaminated mine soil calcium carbonate and hydroxyapatite are still unable to make heavy metal content in the grain of the national food hygiene standards Pb, Cd less than 0.2 mg · kg-1 standard.

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CLC: > Environmental science, safety science > Environmental pollution and its prevention > Soil Contamination and Control
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