Determination of calcium in vitamin juice by dialysis ion chromatography

Establish a method for determination of calcium in vitamin juice by dialysis ion chromatography. The sample was diluted with deionized water, and directly into the ion chromatography system through dialysis. The linear relationship is good in the range of 1 mg / L ～ 5 mg / L (r = 0.9999). The RSD (n = 7) of the peak area of ​​the sample is 0.902% to 1.39%. The recovery rate of standard addition is 97.9% ～ 104.5%. The method was compared with the national standard atomic absorption spectrophotometry for feasibility comparison test (t = 0.321, p> 0.5). There was no significant difference between the two methods. The method was simple, fast, and less matrix interference. It is suitable for the detection of vitamin juice drinks containing calcium.

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