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[Urinary iodide analysis: critical study of the digestion method].
S Fallouh1, P-J Lejeune, J Barbaria
1Université de médecine de Damas, Syrie.
Annales De Biologie Clinique
|November 26, 2004
Summary
A new digestion method using nitric and hydrochloric acids accurately measures urinary iodine. Conventional methods like ammonium persulfate and chloric acid digestion can cause significant errors in iodine status assessment.
Area of Science:
- Analytical Chemistry
- Biochemistry
- Environmental Health
Context:
- Urinary iodine measurement is crucial for assessing iodine status and public health.
- The Sandell-Kolthoff reaction is a common colorimetric assay for urinary iodine.
- Accurate iodine determination requires a reliable preliminary digestion step.
Purpose:
- To evaluate the efficacy of three different digestion methods for urinary iodine analysis.
- To identify potential sources of error in conventional digestion techniques.
- To introduce and validate a novel nitric acid/hydrochloric acid digestion process.
Summary:
- Three digestion methods (ammonium persulfate, chloric acid, and nitric acid/hydrochloric acid) were compared for urinary iodine measurement.
- Chloric acid and ammonium persulfate methods showed significant errors due to incomplete iodine transformation or assay interference.
- The combined nitric acid/hydrochloric acid digestion proved reliable, avoiding errors and ensuring accurate iodide determination.
Impact:
- The nitric acid/hydrochloric acid method offers a superior alternative for precise urinary iodine assessment.
- This validated method can enhance the accuracy of iodine status evaluation in epidemiological studies.
- Improved iodine status assessment contributes to better public health strategies and nutritional guidance.