BS ISO 20647婴儿配方奶粉和成人营养配方奶粉-总碘的测定-电感耦合等离子体质谱法(ICP-MS)

BS ISO 20647 Infant formula and adult nutritionals-Determination of total iodine-Inductively coupled plasma mass spectrometry (ICP-MS)

中文关键词:  ISO 20647  婴幼儿配方奶粉  成人营养配方  总碘  电感耦合等离子体质谱法  翻译

英文关键词:ISO 20647  infant formula  adult nutritionals  total iodine  inductively coupled plasma mass spectrometry  translation

中文摘要:

      本文全文译自国际标准BS ISO 20647: 2015(E) Infant formula and adult nutritionals-Determination of total iodine-Inductively coupled plasma mass spectrometry (ICP-MS)。该标准规定了ICP-MS法测定婴儿配方奶粉和成人营养配方奶粉中总碘的测定方法。所有粉末状样品在分析前需要按一定比例用水稀释进行复原, 即食样品(RTF)无需复原。称取约一定质量的复原试样, 加入5% KOH溶液, 在烘箱或微波消解装置中105 ℃±5 ℃进行消解, 微波消解时消解容器盖子应稍微松开。消解完成后加入碘稳定剂-氨水-Na2S2O3溶液, 定容, 混匀。取适量消解液过1 μm滤膜, 用141Pr作内标, ICP-MS直接测定滤液中碘的含量。该方法线性范围0.25~100 ng/mL, 能快速、准确、灵敏地测定婴儿和成人配方奶粉中总碘含量。

英文摘要:

      This paper is the translation of BS ISO 20647:2015: Infant formula and adult nutritionals- Determination of total iodine-Inductively coupled plasma mass spectrometry (ICP-MS). This standard specifies the method for the determination of total iodine in infant formula and adult nutritional formula by ICP-MS. All powdered samples are required to be analyzed on a reconstituted basis. After weighing a certain quality of the reconstituted sample, 5% KOH solution is added, then digested in the oven or microwave digestion device at 105 ℃±5 ℃. Microwave digestion container lid should be slightly released. After the completion of digestion, the iodine stabilizer-ammonia-Na2S2O3 solution is added, whereafter, adding water to the volume, and mixing thoroughly. Taking an appropriate amount of the digestion through 1 μm filter, the filtrate is determined by ICP-MS with 141Pr as internal standard. The method has a linear range of 0.25~100 ng/mL, which can quickly, accurately and sensitively determine the total iodine content in infant formula and adult nutritionals.