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Spectrophotometric method vs ion selective electrode for field determination of fluoride in water and complex samples

Author Affiliations

  • 1Govt. Naveen College, Bori, Durg, Chhattisgarh, India
  • 2Bhilai Institute of Technology, Durg, Chhattisgarh, India
  • 3Bhilai Institute of Technology, Raipur, Chhattisgarh, India

Res.J.chem.sci., Volume 7, Issue (5), Pages 31-37, May,18 (2017)


Spectrophotometric method based on the bleaching effect of fluoride ions on the dark red zirconium dye lake was used for determination of fluoride in water samples in field conditions and results obtained were compared with the results of potentiometric ion selective electrode method. It was found that results of spectrophotometric method were very close to those of potentiometric method. Therefore spectrophotometric method can be used for field determination of fluoride with an error limit of ±0.1 mg/l. Spectrophotometric method was also used to determine fluoride concentration in complex samples such as toothpastes and mouthwashes and the result obtained was in good agreement with that obtained from potentiometric method. Study also confirmed that higher concentration of chloride ion in water samples does not affect fluoride determination by this method. Spectrophotometric method is easy to operate and less expensive than potentiometric ion selective method, hence more suitable for field determination of fluoride in samples.


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