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The determination of the nitrite content of several pickled vegetables

FAN Ya-na,GAI Ke (School of Chemistry and Chemical Engineering,Longdong University,Xifeng 745000,Gansu,China)  
Aim To establish a method for determining the content of the nitrite in several pickled vegetables,which are saled in the market.Methods Nitrite react with 4-aminobenzenesulfonic acid in weak acidic media to produce 4-sulfobenzenediazonium,which reacted with N′-(naphthalen-1-yl)ethane-1,2-diamine hydrochloride to produce a red diazene compound,the red compound was detected by spectrophotometer.Results The calibration graph for aqueous procedure was obtained by plotting absorbance values at 540 nm against nitrite concentration.Beer's law was obeyed over the range 0~20 μg of nitrite in an overall aqueous volume of 50 mL.The calibration graph is a straight line,obeying equation A=(1.447x-0.138)×10-2,where A is the absorbance and x(μg) is the amount of nitrite,with correlation coefficient R=0.999 0.The nitrite content in several pickled vegetables sold in the market were determined by the method.The determining results shown that the content level of nitrite in the pickled vegetables was within the range of Chinese National Food Standard.Conclusion The method is accurate,rapid,simple,can be applied in determining the nitrite content of the pickled vegetables.
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