离子色谱-直接紫外检测法测定食品接触材料中的六价铬迁移量

目的建立一种离子色谱-直接紫外检测法测定食品接触材料中六价铬迁移量的新方法。方法样品经碱性食品模拟物(碳酸钠-盐酸,pH=8.5)浸泡后,使用氯化铵-氨水溶液为淋洗液,IonPacA S7(4 mm×250 mm)阴离子分析柱分离,以紫外检测器在350 nm波长直接检测。结果本方法在0.001～0.5 mg/L范围内线性关系良好,线性方程为y=10.8554x+0.00472,r=0.999 9,检出限为0.000 3 mg/L,定量限为0.001 mg/L,样品加标回收率为88%～113%,相对标准偏差(n=6)为1.9%～9.0%。结论本方法具有灵敏度高、准确性好、检出限低、操作简便易行等特点,适用于日常样品检测。

Determination for migration of hexavalent chromium in food contact materials by ion chromatography with direct ultraviolet detection

Objective To establish a new method for determination of migration of hexavalent chromium in food contact materials. Methods After immersion in food simulants, ammonium chloride-ammonia solution was used as the eluent. The IonPacAS7 (4 mm×250 mm) anion analysis column was used for separation, and directly detection was performed by the ultraviolet (UV) detector at 350 nm wavelength. Results This method showed a good linear in the range of 0.001-0.5 mg/L, the linear equation was y=10.8554x+0.00472, r=0.999 9. The detection limit was 0.000 3 mg/L, the limit of quantification was 0.001 mg/L. The recovery rate was in the range of 88%-113%, and the relative standard deviation was in the range of 1.9%-9.0%(n=6). Conclusion This method had the characteristics of high sensitivity, good accuracy, low detection limit and easy operation. It was suitable for routine sample detection.