Measurement and Safety Evaluation of Nitrite and Nitrate in Winter Tunnel Vegetables of Qingdao
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Abstract:
Griess reagent-ultraviolet spectrophotometry method was used to determine the contents of nitrite and nitrate in 217 winter vegetable samples which sold in Qingdao. Results showed that nitrate contamination in leaf vegetables was more serious than other samples. Most samples were at the levels of light and moderate nitrite contamination. It can give theoretical basis and data support to the vegetables consumption to local residents.
