I currently use a classic method to identify fluoride and the six other major anions in water and usually the recovery seems to be pretty good. However, I've noticed that whenever I run a sample (that also contains iron), I get a much lower fluoride concentration than I expected.
Any thoughts on how to overcome this?
Depends if your analysis is oriented in the case of anions or cations;
In the case of cation analysis you can try this:
Fluorides are the base of the acid HF; as it is not a so strong acid you can make more acid the solution with a very strong acid as H2SO4; in this case HF remain bond and fluorides are more difficult to bond to metals.
In the case you are searching for anions the best thing is to complex metal ions with something that has more appeal to them than F-; EDTA seems to be the more suited candidate
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