여름정기학술대회
2022여름초록
발표자 및 발표 내용
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포스터발표 |
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Brief Oral Presentation 발표신청 |
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공동저자
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접수자
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Iodine is an essential component of human nutrition. Insufficient intake of iodine is related to iodine deficiency disorder or low thyroid function that causes symptoms of hypothyroidism. Small amounts are needed for good health. The determination of iodine analysis has been mainly applied using inductively coupled plasma-mass spectrometry (ICP-MS) and inductively coupled plasma-optical emission spectrometry (ICP-OES) has usually used an acidic sample matrix. However, the determination of iodine in the acidic matrix, such as nitric acid or acetic acid, is interrupted by memory effects that result in elevated background signals between individual sample analysis runs using ICP-OES and ICP-MS. In this study, we have investigated minimizing the matrix effects by applying nitric acid, tetramethylammonium hydroxide (TMAH), or deionized water using ICP-OES. The most effective rinsing solution was the TMAH solution. The LOD of iodine in ICP-OES at 178.276 nm was 2.0 ppm using 0.5% TMAH solution as the sample matrix. Further iodine with 0.5% TMAH was analyzed by two ICP-MS instruments. One is sector field ICP-MS and the other is collision/reaction cell ICP-MS. The LOD of iodine-127 with 0.5% TMAH was 3 ppb by sector field ICP-MS. In the case of sector field ICP-MS, it is hard to measure the iodine-129, one of the isotopes of iodine, due to the isobaric interference of xenon-129 (26.4% of the natural xenon abundance) that comes from the argon gas plasma. However, the collision/reaction cell ICP-MS can overcome the isobaric interference, xenon-129, to remove it by the reaction of xenon-129 with oxygen in a collision cell. The LOD of iodine-127 was 60 ppt, and the LOD of iodine-129 was 460 ppt using collision/reaction cell ICP-MS. Therefore, the sensitive analysis of iodine has achieved by the collision/reaction cell ICP-MS.
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