Is there a comparison between colorimetric and electrochemical methods for fluoride analysis?

Document ID

Document ID TE3423

Version

Version 5.0

Status

Status Published

Published Date

Published Date 07/24/2018
Question
Is there a comparison between colorimetric and electrochemical methods for fluoride analysis?
Summary
Fluoride method comparison
Answer
Hach offers both colorimetric and electrochemical methods for fluoride.

Colorimetric fluoride analysis:
  • Methods 8029, 10225, and 10275 are all colorimetric methods and are based on the same chemistry.
  • In each case, the test takes about 5 minutes to complete. All are EPA accepted for reporting drinking water and wastewater.
  • Methods 8029 and 10225 have reagent solution and AccuVac® Ampules versions (the concentration range is from 0.02 - 2.00 ppm). The AccuVac® Ampules versions are popular, but only report to one decimal place on handheld colorimeters (they report two decimal places on spectrophotometers). Using the reagent solution, two decimal places are reported. Method 10275 also reports two decimal places and has a concentration range of 0.1-2.50 ppm.
  • Methods 10225 and 10275 do not contain arsenic while method 8029 contains arsenic.
Electrochemical fluoride analysis:
  • Electrochemical methods for Fluoride have a much larger concentration range. For example, a complete set for fluoride analysis can be purchased HQ440D Laboratory Fluoride (F-) Ion Meter Package with ISEF121 Ion Selective Electrode (Product # 8508000). The concentration range of the fluoride electrode included in this package is 0.01-19,000 ppm.
  • Electrodes need regular calibration. Including calibration, a test will take approximately 10-20 minutes.
  • Electrode methods are EPA equivalent (as opposed to approved or accepted). It is recommended to speak with a regulator first if reporting is required.

 

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