摘要
建立了乳制品中碘含量的微波消解-电感耦合等离子体质谱测试方法. 方法以硝酸为消解介质,镨做内标.方法的检出限为 0. 02 μg / kg,线性范围为 0 ~ 100 μg / L,相关系数 r 优于 0. 999 5. 相对标准偏差 RSD（%）均在5. 0%以下,加标回收率在94. 1% ~ 97. 7%之间,GBW10017 奶粉标准物质的测定结果与标示值-致. 试验结果表明所建立的方法灵敏度高、简便、快速、准确,适用于乳制品中碘含量的测定.
A method for the determination of total iodine by microwave digested - inductively coupled plasma massspectrometry （ICP -MS） in infant formula using nitric acid as the digestion medium and Pr as the internal standard isdeveloped. The detection limit of the method was 0. 02 μg / kg, while the linear range was 0 ~ 100 μg / L and the linearcoefficient was better than 0. 999 5. The precision of the method （RSD %） was less than 5. 0%. Precision and accuracyare evaluated by the analysis of certified reference materials GBW10017 milk powder. The determined iodine contents werein good agreement with the certified values. The spiked recoveries of real samples were from 94. 1% to 97. 7%. Theexperiments show that this method is sensitive, simple, rapid, and accurate for the determination of iodine contents in dairyproducts.
出处
《分析测试技术与仪器》
CAS
2016年第3期184-188,共5页
Analysis and Testing Technology and Instruments
