营养强化食品中钙的离子色谱测定法

Determination of Calcium in Nutritive Food by Ion Chromatography

目的建立营养强化食品中钙含量的离子色谱测定法。方法样品经硝酸、高氯酸混合酸消化后采用离子色谱法直接测定营养强化食品中钙含量。结果离子色谱法测定强化食品中钙含量的线性范围为0.10～500mg/L,回归方程为y=244x-7.92,r=0.9998,最小检出限为0.02mg/L,RSD为0.50%～4.00%,回收率为95.0%～103.0%。结论该方法操作简单、快捷,具有可靠的准确度和良好的精密度,且灵敏度高于传统的方法。

Objective To establish a method for the determination of Ca^2＋ cations in the nutritive food by ion chromatography. Methods After being digested by the mixture of nitric acid and perchloric acid, the Ca^2＋ cations in the nutritive food were determined by ion chromatography （IC）.Results The optimum chromatographic conditions were studied thoroughly,the linear range was 0.10-500 mg/L, r=0.9998 .The lowest detection limit of Ca^2＋ cations in nutritive food was 0.02 mg/L, RSDs were 0.50%-4.00%, the rates of recovery tested by the standard addition method were in the range of 95.0%-103.0%. Conclusion This method is simple, fast, sensitive and accurate.