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| Pollution status and source analysis of heavy metals in tea and soils in the main Liubao tea production area of Wuzhou, Guangxi |
| Received:March 10, 2023 |
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| KeyWord:soil;Liubao tea;heavy metals;pollution status;source analysis |
| Author Name | Affiliation | | PENG Xuerui | No. 270 Geological Team of Guangxi Zhuang Autonomous Region, Liuzhou 545005, China | | ZHOU Siyu | No. 270 Geological Team of Guangxi Zhuang Autonomous Region, Liuzhou 545005, China | | CHEN Xiang | No. 270 Geological Team of Guangxi Zhuang Autonomous Region, Liuzhou 545005, China | | CHEN Congyou | No. 270 Geological Team of Guangxi Zhuang Autonomous Region, Liuzhou 545005, China |
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| Abstract: |
| To examine the pollution status and sources of heavy metals in tea and soil in the Liubao tea growing areas of Wuzhou, Guangxi, we collected 45 samples of tea and the corresponding rhizosphere soils from July to September 2021 and determined the presence of eight heavy metal elements(As, Cd, Cr, Cu, Hg, Ni, Pb, and Zn)in these samples. On the basis of single factor index analysis and the Nemerow comprehensive pollution index method, we evaluated the pollution status of heavy metals in the soil. Factor analysis and positive matrix factorization were applied to analyze the sources of heavy metals in soils, and correlation analysis and bioconcentration factors were used to assess the effect of soil-borne heavy metals on tea. The results revealed that areas in which soil contained high Pb, Zn, and Cd contents were mainly in the vicinity of a lead-zinc mine located in the study area. The content of Hg was found to be higher in the southwest than in the northeast of the study area; whereas high content areas of Cr, Ni, and Cu were detected in the southwest and northeast, and areas with high contents of soil-borne Hg were located in the west of the study area. As and Cd in tea garden soil were found to exceed the corresponding standards by 6.67% and 2.22%, respectively. We established that the heavy metals in soil were derived from mining activities, soil parent materials, fossil fuel combustion, and agricultural activities, with respective percentage contributions of 32.80%, 28.86%, 19.50%, and 18.84%, respectively. Analysis of tea samples indicated that the content of heavy metals in tea did not exceed the respective standards. Among the eight assessed heavy metals, tea showed a higher bioaccumulation of soil-borne Cd, Zn, Cu, and Ni. Given that the Cd content in tea is mainly derived from the soil, we should pay particular attention to Cd imported into tea garden soil from external sources. |
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