Is uv-vis spectrophotometry is applicable to analyze processed solns.' concentration (%) of IPA, KOH and HF?

Question

Are there any reagents to add to these solutions so it can absorb in uv-vis? I have a client which used refractometer to analyze their processed solutions (HF, IPA, KOH content). However, they need to have alternative instruement since their refractometer model has not been sold in the market anymore. They wanted to try uv-vis since it's the only instrument that they have. If it's not applicable, what other methods of analysis are applicable to analyze concentration of these solutions. Their concentration range is (40-47%). They wanted to know if their processed csolutions are within the range. I think titration of KOH (colorimetric), and HF (potentiometric) is applicable. While for IPA, we can use GC. However, my client wanted, if possible, to analyze the three processed solutions using the same intstruemnt but not at the same time. They just want to purchase one kind of instrumetn so that it would not be too costy in their part. Thank you

Answer 1

This application would depend on the contaminants in the solution and their absorption in the UV-vis range. By IPA do you mean isopropyl alcohol?

You may be able to detect all three through flame photometry/AA spectroscopy but this will depend on the accuracy that is needed.

Answer 2

Well as you indicated, the use of acid/base indicators would work w/ KOH and HF.

For IPA you may want to check the NIST site to see if it abosrbs in the near UV.

I would think you might have more luck w/ IR spectroscopy. Especially if you can add complexing agents.

Answer 3

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