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目的建立了食用油中亚硝酸盐和硝酸盐的离子色谱分析方法。方法样品用75℃温水在超声震荡下提取出硝酸盐与亚硝酸,该样品制备液先后经IC-:RP柱、IC-Ag柱和IC-Na柱净化后直接上机测定。结果本方法中NO_2~-标准浓度在0.0 mg~0.2 mg/L、N03~-标准浓度在0.0 mg~7.0 mg/L范围内,均具有较好线性>0.999,方法的最低检出限分别为0.001 7 mg/L、0.002 5 mg/L回收率分别为98.3%~103.1%、99.4.%~102.6%,Rsd分别为2.10%,1.51%。结论本方法具有灵敏度高,操作简单等优点,适用于基层实验室对食用油中亚硝酸盐和硝酸盐含量的日常检测工作。
Objective To establish a method for the analysis of nitrite and nitrate in edible oil by ion chromatography. Methods The samples were extracted with nitric acid and nitrite by ultrasonic shaking at 75 ℃. The sample preparation solution was purified by IC-: RP column, IC-Ag column and IC-Na column, and then directly measured on the machine. Results The method showed a good linearity of> 0.999 for NO 2 ~ - standard concentration of 0.0 mg ~ 0.2 mg / L and N03 ~ - standard concentration of 0.0 mg ~ 7.0 mg / L. The minimum detection limits were The recoveries of 0.001 7 mg / L and 0.002 5 mg / L were 98.3% -103.1% and 99.4% -102.6%, respectively. The Rsd was 2.10% and 1.51% respectively. Conclusion The method has the advantages of high sensitivity, simple operation and so on. It is suitable for routine testing of nitrite and nitrate in cooking oil in grassroots laboratories.