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Proper analytical method for free fluoride in acidic solution

We are analysing Trifluoroacetic acid ⇦ on eBay or Amazon [affil link] which may contain H Fin ppm level, we have analysed HF by orion meter but the results are not reproducible please suggest a proper method to do so.

Thanks,

Mr. Swaran Singh
QC Incharge - Surat, Gujarat, INDIA
2003

I suspect that you are using an Orion 407 with their cheapest F electrode. It will do ok for pure solutions, but will not work very well for solutions containing other metal ions. There are more complex methods available that will give you repeatable results. The correct TISAB solution will be mandatory. Contact Thermo Orion tech services for some literature on the subject analysis.

James Watts
- Navarre, Florida
2003

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