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目的建立水、尿及食品中痕量碘的电感耦合等离子体质谱检测方法,为碘营养状况的研究提供科学的检测技术。方法样品经质量分数为0.25%的四甲基氢氧化铵碱溶液稀释法或密闭溶样法处理后,应用电感耦合等离子体技术测定。结果方法的线性相关系数大于0.999 7;水样直接测定,检出限为0.20!g/L;尿液稀释10倍测定,方法检出限为0.13!g/L;食品以称取0.5 g定容至25 ml计,检出限为5.6!g/kg;分别对冻干人尿中碘、水中碘及食品中多种生物成分标准物质碘水平独立测试7次,其测定值的相对标准偏差均小于5%,且测定值均在标准值范围内。结论建立的分析方法操作简单、抗干扰性强、灵敏度高,适用于水、尿样、食品等大批量样品中痕量碘的快速准确测定。
Objective To establish an ICP-MS method for the determination of trace amounts of iodine in water, urine and foodstuffs, and to provide scientific detection techniques for the study of iodine nutrition status. Methods The samples were treated with alkaline solution of tetramethylammonium hydroxide (0.25%, mass fraction) or airtightly dissolved method, and then determined by inductively coupled plasma technique. Results The linear correlation coefficient of the method was greater than 0.999 7; the direct determination of water samples with a detection limit of 0.20 μg / L; urine 10-fold dilution, the detection limit was 0.13 μg / L; Volume to 25 ml, with a detection limit of 5.6 μg / kg. The iodine levels of iodine, water and iodine in food samples were measured independently for 7 times. The relative standard deviations Less than 5%, and the measured values are within the standard value range. Conclusion The established analytical method has the advantages of simple operation, strong anti-interference ability and high sensitivity. It is suitable for rapid and accurate determination of trace amounts of iodine in large quantities of water, urine samples and foodstuffs.