Currently, peoples are using the lengthy spectrophotometric method and the ISE method.
In concerned with Fluoride in water, 5 mg/lit is too high. However for the analysis of F in water, the digital Fluoride meter of various companies are widely available in market. Measurement technique is simple and quick as well as economical. We have used this and our results have been considered as of high order of accuracy and well recognised along with publication in repute journals.
Ion chromatography is an easy analysis for fluoride. See one of my publications oosted on Research Gate.
We agree with Shalini Gupta answer
The ion chromatography is simplest method to measure oncentration of fluoride in water samples
Dr. Atta Rasool
To join the first three responses, I will say ion chromatography is the way to go and it is reliable. If there is a need for other anions such as nitrite, nitrate, chloride, bromide, phosphate, and sulfate, ion chromatography can be set up to analyze all the 7-anions (total of 7 including fluoride) in one run.
Yao B. Kouame
Fluride ion can be determined by ion chromatography using special techniques such as dilute eluent or gradient elution using an NaOH eluent.
You can also measure fluoride in water with Ion selective electrode. It is also a simple method.
If you're wanting a quick and easy method I'd recommend the Hach pocket colorimeter. I like these because they're portable as well as they are easy to use and fast. They have many pocket colorimeter products and the one that works well for flouride is at the following link: http://www.hach.com/pocket-colorimeter-ii-fluoride-spadns-ii-arsenic-free/product?id=7640445206 Note however it only reads to 2.0 mg/L so you would have to do a dilution and then calculate back. 5.0 mg/L flouride is very HIGH for drinking water, not low. I'm in the U.S. so our recommended level use to be 0.7-1.2 mg/L but in 2011 the CDC changed the recommended amount to NO MORE than 0.7 mg/L. The EPA has two limits: They recommend only 2.0 mg/L to water treatment facilities but don't enforce it. Then their maximum is 4.0 mg/L and is legally enforceable. It may be difficult to find a simple-to-use kit that reads as high as 5.0 and dilutions will be needed.
Also the method of capillary electrophoresis is possible (determinaion of several anions in water, including fluoride).
ion chromatography, ISO 10304-1, high conc.: till 400 mg/L, low conc.:we have detected 5 ppb.
Fluoride is very sensitive issue in drinking water. It is noted , 5 mg/ lit fluoride in drinking water is very very high. Against the permissible limit is 1.5 mg/lit. Thus this subject must be given top priority.
Dear Singanan Malairajan,
The Best Method for Fluoride determinations at Low cost
1) Ion Selective electrode method
With the help Of TISAB Buffer Solution We can Check 0.1 to 100 ppm fluorides
2) Alizarine-Red (Visual Color Comparison) Method
As per IS: 3025(P-60) 2008
Note : This test Can also perform By UV-Vis Spectrophotometer @510nm with DM Water as a Reference Solution
3) Spadns Method
By using UV-Vis Spectrophotometer Zirconium-Spands Reagent
APHA 22nd Edn 2012
https://law.resource.org/pub/in/bis/S02/is.3025.60.2008.pdf
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