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- W2388786026 abstract "Objective To set up a new method for determining urinary iodine in a range of 300 ~ 1 200 μg/L by As3+-Ce4+ catalytic spectrophotometry using ammonium persulfate digestion to facilitate surveillance of urine iodine in areas of high concentration of iodine. Methods 0.2 ml of each urine sample was pipetted and was added with 1 ml 1.0 mol/L ammonium persulfate. All tubes were heated for 60 minutes at 100 ℃ and then cooled down to room temperature. 2.5 ml 0.11 mol/L arsenious acid solution was added into each tube. All the tubes were again warmed up for 15 minutes at 30℃. Finally, 0.5 ml of ceric ammonium sulfate solution at a concentration of 0.053 mol/L was added to each tube at 15 ～ 30 second intervals. 18 min after the first addition of ceric ammonium sulfate, its absorbance at 405 nm was read. Successive readings were read at the same interval. Results The calibration was in a range of 300 ~ 1 200 μg/L. The variations(CV) were 1.9%, 1.9% and 1.3% when testing urinary iodine at 322.9 μg/L, 650.9 μg/L and 1 149.4 μg/L respectively. The average recovery was 97.9% in a range of 96.0~99.7% when quantitatively measuring iodine added in different urine samples. Conclusion This method is suitable to measure high iodine in urine and easier to be performed with better precision and accuracy." @default.
- W2388786026 created "2016-06-24" @default.
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- W2388786026 date "2005-01-01" @default.
- W2388786026 modified "2023-09-23" @default.
- W2388786026 title "300～1200 μg/L iodine in urine measured by As~(3+)-Ce~(4+) catalytic spectrophotometry using ammonium persulfate digestion" @default.
- W2388786026 hasPublicationYear "2005" @default.
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