气相色谱法测定乳品中的硝酸盐.

              Tengzhou Xiangying Analysis Technology Co. Ltd for the determination of nitrate content in dairy products by gas chromatography XiangyingGC7990plus. After the protein was isolated from the samples, the nitrate was prepared into nitrobenzene derivatives, and the content of nitrate in the sample was measured with the standard curve method. This method is cadmium column method is simple, rapid, high sensitivity, less interference, the lowest detectable dairy 20 g / kg of nitrate, linear range in 20 ~ 200ppb samples determination of the coefficient of variation was 3.10% (n = 7), recycling rate is 95% ~ 116.8.                                                                                                                             
            滕州市翔鹰分析技术有限公司采用XiangyingGC7990plus气相色谱法测定乳制品中硝酸盐含量。将样品中的蛋白质分离后,把硝酸盐制备成硝基苯衍生物,测量,以峰高定量,用标准曲线法定量样品中硝酸盐的含量。此法较镉柱法简便、快速、灵敏度高,干扰少,***低可检出乳品中20μg/kg的硝酸盐,线性范围在20～200ppb样品测定结果的变异系数为3.10％(n=7),回收率在95％～116.8％。

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