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本文建立了离子色谱法测定薯片中磷酸盐的检测方法。薯片样品经10mmol/L的氢氧化钠溶液提取后,三氯甲烷去除油脂,过滤,滤液过On Guard IIRP柱除去样品中的有机物,而后进样至离子色谱,以IonPac AS11HC分析柱进行阴离子交换分离。在0.1～10mg/L质量浓度范围内,磷酸根工作曲线的线性相关系数r为0.9988,样品检出限为10.0mg/kg。同时对样品进行加标,磷酸根的回收率为87.3.0%～110.2%。该方法方便可靠,可应用于薯片中磷酸盐的检测。
This paper established a method for the determination of phosphate in potato chips by ion chromatography. After the potato chips were extracted with 10 mmol / L sodium hydroxide solution, the chloroform was degreased and filtered. The filtrate was filtered on an On Guard IIRP column to remove the organics in the sample, which was then injected into the ion chromatograph and anion exchange on an IonPac AS11 HC analytical column Separated. Under the concentration range of 0.1 ~ 10 mg / L, the linear correlation coefficient r of phosphate working curve was 0.9988 and the detection limit of the sample was 10.0 mg / kg. At the same time, the samples were spiked, the recovery rate of phosphate was 87.3.0% ~ 110.2%. The method is convenient and reliable and can be applied to the detection of phosphate in potato chips.