How to determine the concentration of elemental iodine in a solution
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To analyze the ozone generation amount of the product, I use the iodometry method; the principle involves ozone converting the iodide ions in potassium iodide into elemental iodine, which is then titrated with sodium thiosulfate to determine the amount of ozone. Measurements showed that there were also significant color differences among iodine solution samples of different concentrations. My question is whether there are any good methods or instruments that can determine the concentration of an iodine solution directly based on its color The concentration range is from 0.01 mol/l to 0.1 mol/l. Asking about a spectrophotometer seems difficult, because elements are not ions and do not absorb light in the form of spectra~~~ Could anyone recommend one?
I think a better approach is to directly titrate with sodium thiosulfate. Simple, fast, accurate.
It is quite impossible to determine the concentration of elemental iodine directly based on the color of the solution! It can only be titrated using a sodium thiosulfate standard solution!
However, the efficiency of sodium thiosulfate titration is very low; I have to test hundreds of samples every day, and just the titration process requires one or two people to carry out. If there were good instruments available, even if they were more expensive, that would be ideal
In fact, employees with extensive experience can roughly estimate a range of values by visually observing the color of the solution; the accuracy is fine, but the precision is lacking. Can’t modern instruments still outperform human eyes? :'(
It is possible to estimate a range by eye, after all the sensitivity of the human eye is much higher than that of a spectrophotometer; it’s just that the human eye doesn’t have scales. However, photometric analysis is not very feasible, as the solution is too unstable; even changes in light or temperature alone can affect the results. If you don’t believe me, the original poster can give it a try; I guess they won’t be able to create a standard curve.