| Autor: |
ZHU Jia-jun, LI Liang, HE Shuang, CHEN Jing-zhou |
| Jazyk: |
English<br />Chinese |
| Rok vydání: |
2022 |
| Předmět: |
|
| Zdroj: |
Shipin yu jixie, Vol 38, Iss 10, Pp 50-54,92 (2022) |
| Druh dokumentu: |
article |
| ISSN: |
1003-5788 |
| DOI: |
10.13652/j.spjx.1003.5788.2022.90188 |
| Popis: |
Objective: This study aimed to establish an efficient and accurate method for the determination of total iodine in milk powder by microwave digestion combining with inductively coupled plasma mass spectrometry (ICP-MS). Methods: Firstly, 0.2 mL of precipitant and 5 mL of ultrapure water were added for mixing and standing, and then 5 mL of nitric acid was added for microwave digestion. After cooling, the volume was fixed to 35 mL with ultrapure water, and then 10 mL of ammonia, 1 mL of stabilizer and 50 μL of TritonX-100 were added in sequence, avoiding the iodine loss. Results: The detection limit was 0.044 mg/kg, while iodine presented favorable linearity in the range of 0~20 μg/L with correlation coefficient (r) of 0.999 9. The precision of the method (RSD %) was less than 5%, and the spiked recoveries of real samples is 90.2% ~ 107.7%. The measured values of various standard substances are consistent with the labeled values. The iodine content of the same milk powder was similar to that of GB 5009.267—2020. Conclusion: The method showed the advantages of high efficiency, good recovery and accurate for the determination of iodine contents in milk powder, ensures personnel safety and reduces instrument maintenance cost. |
| Databáze: |
Directory of Open Access Journals |
| Externí odkaz: |
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