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| Effects of Atmospheric and Dust Deposition on Content of Heavy Metals in Vegetables in Suburbs of Tianjin |
| Received:April 08, 2015 |
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| KeyWord:heavy metal contamination;vegetable field;atmospheric deposition;cadmium;organic fertilizer |
| Author Name | Affiliation | E-mail | | CHENG Ke | College of Resources and Environmental Sciences, Nanjing Agriculture University, Nanjing 210095, China | | | YANG Xin-ping | College of Resources and Environmental Sciences, Nanjing Agriculture University, Nanjing 210095, China | xpyang@njau.edu.cn | | ZHAO Fang-jie | College of Resources and Environmental Sciences, Nanjing Agriculture University, Nanjing 210095, China | |
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| Abstract: |
| Soils in the suburban vegetable fields in China may have a high risk of heavy metal contamination. A field experiment was conducted in a vegetable field with an elevated cadmium content in the soil near Tianjin to investigate the effects of zinc and manganese fertilizers on cadmium uptake by different leafy vegetables and to estimate the contribution of atmospheric and dust deposition on heavy metal content in vegetables. Results showed that the availability of cadmium and other heavy metals in the soils was low and all vegetables produced met the national food safety standards for heavy metals. Furthermore, applications of organic fertilizers enriched with either zinc or manganese had no significant effects on heavy metal content in the vegetables. Three methods were used to investigate the possible sources of heavy metal contamination in vegetables, including monitoring atmospheric deposition, comparing heavy metal content in washed and unwashed vegetables and calculating the relationship between heavy metals and titanium content in vegetables. Results showed that atmospheric deposition and soil dust contributed to 33.7%, 83.7%, 72.8% and 71.0%, respectively, of the total content of cadmium, arsenic, lead and chromium in unwashed vegetables. Washing significantly reduced heavy metal content in vegetables. Therefore, priority should be given to monitoring heavy metal contamination in vegetables caused by atmospheric deposition. |
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