Measure fluoride in potable water - 0 to 2 ppm
FLUORIDE
One of the accepted methods for the
measurement of fluoride in drinking water is that
of using a fluoride ion selective electrode (ISE).
The advantages of using a fluoride ion selective
electrode includes:
Interferences from pH, aluminum, iron and silica
are eliminated by the use of a total ion strength
buffer (TISAB).
Tytronics'® Sentinel ISE
The Tytronics'® Sentinel ISE is an on-line ISE
analyzer, which measures fluoride using a
fluoride ISE. The analyzer uses a batch sampling
technique. All the sample tubing is 1/4" and
consequently small amounts of solids will not
affect instrument performance.
Other advantages of batch sampling are:
ANALYSIS
Tytronics'® Sentinel ISE uses the single known
addition (SKA) measurement technique for every
analysis. This SKA method provides both more
accurate and more consistent results than
obtained using a direct electrode measurement.
A 20 ml of sample is captured, TISAB is added,
and then an aliquot of standard fluoride solution
is added. From the values of the measured
potentials, before and after the addition, the
original sample concentration is determined.
METHOD
The advantage of the SKA technique is that
electrode drift is compensated. The slope of the
response of the ISE electrode is automatically
obtained using the SKA method on a standard of
known fluoride content.
FEATURES:
Duplicates, on-line, the laboratory method
(ISE electrode)
Adds TISAB reagent to alleviate problems
due to sample pH fluctuations
Measures free and bound fluoride by the
addition of CDTA through TISAB reagent
Uses the SKA technique for every analysis so
results unaffected by electrode drift
Automatic slope calibration
Use our Tytronics Sentinel for measuring fluoride in water
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