6
10. Use the 0.5 mL pipet (0353) to add
0.5 mL of *Sodium Arsenite Solution
(4128). Cap and mix.
11. Use the 1.0 mL pipet (0354) to
add 2 measures of *Acid-Zirconyl
SPADNS Reagent (3875). Cap and
mix thoroughly. (This is the reagent
blank.) Dry the tube with a lint-free
cloth.
12. Insert tube into chamber. Close lid.
Select
Scan Sample
. Record result
as Fluoride.
045 Fluoride
0.9
ppm
Scan BLank
Scan Sample
12:00:00 001/500
NOTE: Zeroing the meter with the sample water will result in an error. Meter must be
zeroed with a reagent blank.
NOTE: The meter will remember the last scanned blank reading. It is not necessary to
scan a blank each time the test is performed. To use the previous blank reading, instead
of scanning a new one, scroll to Scan Sample and proceed. For the most accurate
results, the meter should be blanked before each test and the same tube should be
used for the blank and the reacted sample.
CALIBRATION
STANDARDS
The meter should be calibrated with fluoride standards. The calibration should be
done with a distilled or deionized water blank and one fluoride standard of known
concentration. The concentration of the calibration standard should be similar to the
expected concentration of the sample that will be tested.
