Determination of nitrate in dried foods by gas chromatography-thermal energy analyzer.
The method described for determining NO3- in dried foods is based on extraction of NO3- from the sample with subsequent nitration of benzene. The nitrobenzene is extracted with ethyl acetate, analyzed by using a gas chromatograph-thermal energy analyzer (GC-TEA), and quantitated against a nitrobenzene standard. Sensitivity is 100-200 micrograms/kg. Coefficients of variation for analyses of dried foods were 3-13%. Recovery of NO3- from nonfat dry milk spiked at 10 mg/kg averaged 100%.
D002849:Chromatography, Gas / Q000379:methods; D003611:Dairy Products / Q000032:analysis; D005504:Food Analysis / Q000379:methods*; D005519:Food Preservation; D006358:Hot Temperature; D007225:Infant Food / Q000032:analysis; D009566:Nitrates / Q000032:analysis*
D009566:Nitrates