I would like to know the following information:
1. What are the normal limits of iodine concentration from groundwater (wells from people), cow's milk and wood (trees)?
2. What is the critical value of the concentration of iodine from groundwater (wells from people), cow's milk and wood (trees) that generates subclinical deficiency of iodine?
Dear Ana-Maria
I dont know the exact value but, tried to find out some papers. Which might be useful to you...!!!!!!
Sack J, Kaiserman I, Tulchinsky T, Harel G, Gutekunst R. Geographic variation in groundwater iodine and iodine deficiency in Israel, The West Bank and Gaza. J Pediatr Endocrinol Metab. 2000 Feb;13(2):185-90.
Dear Ana-Maria
Iodine (I2) is not available in ground water and available form is Iodide (I-).
Iodide (I-) is converted to Iodine (I2) during water treatment (especially in the chlorination process).
Iodide (I-) level in the ground water is vary from please to place (high in ground water close to brackish water and Sea water)
The mean concentration of total iodine in drinking-water in the USA is 4 µg/litre, and the maximum concentration is 18 µg/litre (2). This is presumably predominantly iodide.
The main natural sources of dietary iodide are seafood (200–1000 µg/kg) and seaweed (0.1– 0.2% iodide by weight). Iodide is also found in cow's milk (20–70 µg/litre) and may be added to table salt (100 µg of potassium iodide per gram of sodium chloride) to ensure an adequate intake of iodine (2,6). The estimated dietary iodine requirement for adults ranges from 80 to 150 µg/day (7).
Ref.: WHO/SDE/WSH/03.04/46
For further details you can refer the document given below
Norwegian groundwater used for drinking water has 7.0 mikrogram/l on the average, min. 1.7, max. 52 mikrogram/l. Not limit for drinking water. I think in Australia they have 100 mikrog/l.
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