Spectroquant Pharo 300 - Page 313

100809
Cell Test
Fluoride
Swirl the cells.
Quality assurance:
To check the measurement system (test reagents,
measurement device, and handling) ready-f
or-use
fluoride standard solution Certipur
®
, Cat.No. 119814,
concentration 1000 mg/l F
–
, can be used after diluting
accordingly.
Check the pH of the
sample, specified range:
pH 3 – 8.
If required, add dilute
sodium hydroxide
solution or sulfuric acid
drop by drop to adjust
the pH.
Pipette 10 ml of the
sample into a reaction
cell, close with the screw
cap, and mix.
Shake both cells vigor-
ously to dissolve the
solid substance.
Reaction time:
15 minutes
Important:
Very high fluoride concentrations in the sample produce
brown-colored solutions (measurement solution should be
violet) and false-lo
w readings are yielded. In such cases
the sample must be diluted (plausibility check).
Release 06/2014 - Spectroquant
®
UV/VIS Spectrophotometer Pharo 300
Add 1 level blue micro-
spoon of F-1K to each
cell, close with the screw
cap.
Measuring range: 0.025 – 0.500 mg/l F
Select method F sens
in the menu
(method
no. 216).
Pipette 10 ml of distilled
water into a second reac-
tion cell, close with the
screw cap, and mix.
(Blank)
Transfer both solutions
into two separate
50-mm-cells.
Place the blank cell into
the cell compartment.
Place the cell containing
the sample
into the cell
compartment.