|
| Contamination characteristics and source apportionment of heavy metals in tobacco-planting soils in Tongren County based on GIS and PMF methods |
| Received:July 07, 2021 |
| View Full Text View/Add Comment Download reader |
| KeyWord:heavy metal;tobacco;soil;positive matrix factorization（PMF）;source apportionment |
| Author Name | Affiliation | E-mail | | CHEN Xue | College of Agriculture, Guizhou University, Guiyang 550025, China | | | LIU Hongyan | College of Agriculture, Guizhou University, Guiyang 550025, China | | | WU Pan | College of Resources and Environmental Engineering, Guizhou University, Guiyang 550025, China
Key Laboratory of Karst Geological Resources and Environment, Ministry of Education, Guiyang 550025, China | | | MENG Wei | Geological Survey Institute of Guizhou Province, Guiyang 550005, China | | | HU Jing | Guizhou Academy of Sciences, Guiyang 550001, China | | | LI Xuexian | College of Agriculture, Guizhou University, Guiyang 550025, China
Key Laboratory of Karst Geological Resources and Environment, Ministry of Education, Guiyang 550025, China | xxli5@gzu.edu.cn |
|
| Hits: 1803 |
| Download times: 1982 |
| Abstract: |
| Heavy metals contamination of soils used for growing tobacco not only affects the quality of tobacco leaves but also poses potential health hazards to smokers. Thus, it is important to study the current situation of heavy metals contamination in these soils and the contributions of sources to ensure safe production of tobacco leaves. The purpose of this study was to assess qualitatively and quantitatively the pollution status and source contributions of heavy metals in soils used for growing tobacco in Tongren, Guizhou Province, China. For this purpose, 267 soil samples were collected systematically to determine the Cu, Ni, Pb, Zn, As, Hg, Cr, and Cd concentrations. The single factor pollution index method（Pi）, pollution load（PLI）, and geostatistical analysis were used to evaluate the soil heavy metal pollution status in the study area. Furthermore, positive matrix factorization (PMF) was applied to quantify the pollution sources and contribution rates. The results showed that Hg and Pb accumulated most significantly in the soils. Their mean values were 2.27 and 1.74 times of the background values of soils in Guizhou Province. The Pi evaluation results indicated that Cd, As, and Pb had the highest contamination levels, and the distribution of high value areas was closely related to the distribution of regional mining and metallurgical activities. The PMF calculations revealed that there were five main types of heavy metal sources affecting the soils：natural sources, lead and zinc mining sources, mixed-traffic and lead and zinc smelting sources, mercury and coal mining sources, and agricultural sources, with contributions of 25.38%, 20.41%, 16.60%, 14.56%, and 23.05%, respectively. Heavy metal pollution of the tobacco-planting soils in the study area was low, and the sources of heavy metals were complex. However, source control of Hg, Cd, and Pb should be emphasized to reduce the pollution risk. |
|
|
|
