Determination of iodide in milk using ion chromatography with inline dialysis

Iodine is an essential trace element. It is found in dairy products, sea fish, sea salt or iodized salt.

Iodide levels in milk and milk powder can be easily analyzed using anion chromatography with conductivity detection after chemical suppression.

Milk is of a quite complex constitution. Especially the fat globules and casein micelles account for some unwanted matrix effects. Time consuming external sample treatment procedures are no longer necessary if you use Metrohm’s superb Inline Sample Preparation (MISP) for ion chromatography. The matrix of milk is removed fully automatic by inline dialysis prior to sample injection.

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• Find detailed information in our Application Note S-162 (iodide in milk powder) (Info Center)
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Tips

• Sample preparation: Using Metrohm’s superb inline dialysis prior to sample injection, also cations (e.g. Na, K, Ca and Mg; Application Note C-28), anions (e.g. chloride, phosphate and sulfate; application notes S-44 and N-18) and carbohydrates (e.g. inositol, xylitol, arabitol, arabinose, mannose, glucose and lactose; application note P-5) in milk or milk powder can be determined. The preferred analysis system for carbohydrates is Metrohm’s 817 Bioscan.
• Validation: For the Validation of Metrohm ion chromatography systems using Standard Operating Procedures see our Application Bulletin 277 (Info Center).