Determination of NO2-and five kinds of anions in pickled vegetables by ion chromatography
The mass fraction of CH3CH(OH)COO-,Cl-,NO2-,NO3-,PO43-,SO42-in pickled sauerkraut,pickled melon and pickled mustard were determined by ion chromatography.Samples were crushed then extracted by ultra pure water and determined after centrifugation and filtration.The pretreatment step of the sample extract was added before the determination of nitrite to eliminated the interference of nitrite determination.The chromatography peak area of CH3CH(OH)COO-,Cl-,NO2-,NO3-,PO43-and SO42-shows good linear relationship with mass concentration in the measured concentration range.The correlation coefficient(R2)are 0.999 9,0.999 8,0.999 9,0.999 9,0.999 8 and 0.999 7,respectively.The method detection limits(S/N=3)are 3.543,0.432,0.294,0.916,1.673 and 0.656 mg/kg,respectively.The highest detection amount of NO2-in the sample is 5.65 mg/kg,which do not exceed the limit value specified in GB2760-2014.The relative standard deviation(n=5)of the measured results is 4.65％,with the recovery of standard added in samples from 92.3％to 96.4％.
ion chromatographypickled vegetablesNO2-content detection
万方数据
