| Nitrate and nitrite concentrations in vegetables and soils in Yuzhong County of Gansu Province and their safety evaluation |
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| DOI：10.7606/j.issn.1000-7601.2016.03.36 |
| Key Words: vegetable soil nitrate and nitrite safety evaluation Yuzhong County of Gansu Province |
| Author Name | Affiliation | | WANG Yan-bin | Northwest University of Nationalities, School of Chemical Engineering, Lanzhou, Gansu 730030, China； Key Laboratory for Utility of Environment-friendly Composite Materials and Biomass in Universities of Gansu Province, Lanzhou, Gansu 730030, China | | YANG Yi-ming | Northwest University of Nationalities, School of Chemical Engineering, Lanzhou, Gansu 730030, China； Key Laboratory for Utility of Environment-friendly Composite Materials and Biomass in Universities of Gansu Province, Lanzhou, Gansu 730030, China | | ZENG Liang | Northwest University of Nationalities, School of Chemical Engineering, Lanzhou, Gansu 730030, China； Key Laboratory for Utility of Environment-friendly Composite Materials and Biomass in Universities of Gansu Province, Lanzhou, Gansu 730030, China | | SU Qiong | Northwest University of Nationalities, School of Chemical Engineering, Lanzhou, Gansu 730030, China； Key Laboratory for Utility of Environment-friendly Composite Materials and Biomass in Universities of Gansu Province, Lanzhou, Gansu 730030, China | | ZHAO Li-bin | Sichuan Nitrocell Company, Ltd., Chengdu, Sichuan 610063, China |
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| Abstract: |
| A systematic survey of nitrate and nitrite concentrations in five kinds of vegetables (involving 100 samples) and their corresponding soils at 20 sampling sites in vegetable plots of Yuzhong County, Gansu Province, was conducted for assessing their pollution, bioavaibility, and safety to local residents. The results showed that the average concentrations of nitrate and nitrite in surface soils in the studied plots were 30.58 mg·kg-1 and 52.35 mg·kg-1, respectively, and that in deep soils were 9.14 mg·kg-1 and 0.11 mg·kg-1, respectively, indicating that the deposition of nitrate and nitrite was mainly in surface soils. The average concentrations of nitrate and nitrite in vegetables were 1649.18 mg·kg-1 and 0.64 mg·kg-1 fresh weight (FW), respectively. The average bio-concentration factors (BCFs) of nitrate and nitrite in vegetables were 53.94 and 0.01, respectively. The average concentrations of nitrate and nitrite in five vegetables were significantly different, with nitrate being higher than nitrite in vegetables. The order of nitrate in vegetables was Chinese cabbage ≈ cauliflower > leek ≈ celery ≈ cabbage，and that of nitrite in vegetables was leek > cauliflower ≈ cabbage ≈ celery >> Chinese cabbage. Chinese cabbage had stronger enrichment ability of nitrate. Of all the samples, 2% was slightly, 7% moderately, 33% severely, and 56% seriously polluted by nitrate. |
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