Iodine content in drinking water and other beverages in Denmark

Area of Science:

• Environmental Science
• Food Science
• Nutritional Science

Background:

• Iodine is an essential micronutrient crucial for thyroid hormone synthesis.
• Dietary intake studies rely on accurate iodine content data in various food and beverage sources.
• Understanding geographical and seasonal variations in iodine is vital for public health nutrition.

Purpose of the Study:

• To quantify iodine concentration variations in Danish drinking water across different geographical locations.
• To compare iodine levels between organic and non-organic milk products.
• To analyze iodine content in a range of other common beverages consumed in Denmark.

Main Methods:

• Collection of tap water samples from 41 diverse Danish localities.
• Systematic sampling of organic and non-organic milk during summer and winter seasons.
• Analysis of soft drinks, beers, juices, and wines from various producers using inductively coupled mass spectrometry (ICP-MS).

Main Results:

• Significant geographical variation in tap water iodine content (2.1–30.2 microg/l), with higher levels in eastern Denmark and lower levels in western Denmark.
• Organic milk exhibited consistently lower iodine concentrations than non-organic milk.
• Iodine content varied across different types of beverages analyzed.

Conclusions:

• Substantial geographical and seasonal fluctuations in iodine concentrations were observed in Danish beverages.
• These variations significantly influence the iodine contribution to the Danish diet.
• Accurate iodine intake calculations necessitate considering these beverage iodine variations.