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21 Νοε 2013 · What happens to the liquid when the iodine is added? Procedure. • Pick one of the types of salt you want to test and measure out four tablespoons (tbsp.) into a clean, plastic, disposable cup....
You’ll investigate whether different salts have iodine by mixing them with laundry starch, which forms a blue-purple-colored chemical with iodine. (Vinegar and hydrogen peroxide are added to the salt solution to help this chemical reaction take place.) Materials
20 Μαΐ 2016 · The median and interquartile range iodine concentration in salt was 2.9 mg/kg (IQR: 2.4-3.7). The results show that only 25 % of households use iodized salt. The recommended iodine concentration in salt of 15–40 mg/kg was met only in 4.5 % of salt samples. The bulk salt is used by 8 % of households.
The semi-quantitative estimation of the salt iodine by using a rapid test kit (RTK) is based on the reaction between starch and iodine to form starch-iodine complex. This test solution contains an acidic buffer and a reducing agent, which convert potassium iodate (KIO 3) to elemental iodine (I 2).
This is how you can visibly see if there is iodine. Vinegar and hydrogen peroxide are added to the salt solution to help the iodine reaction with starch take place. Specifically, vinegar is an acid, and so when you add it you are changing the pH of the solution so that the reaction can take place.
11 Μαΐ 2016 · The main indicator adopted to track universal salt iodization has been the coverage of adequately iodized salt in households. Rapid test kits (RTK) have been included in household surveys to test the iodine content in salt.
Determine the performance of a laboratory spectrophotometric method and three single-wavelength spectrophotometric devices for quantifying iodine in salt against the standard iodometric titration method. Compare the analytical accuracy and precision, simplicity of use, and cost.
