Fluoride, Spadns Method - Hach DR/850 Procedures Manual

FLUORIDE
(0 to 2.00 mg/L F
*
SPADNS Method
Using SPADNS Reagent Solution
1.
Enter the stored
program number for
fluoride (F) powder
pillows.
Press:
PRGM
The display will show:
PRGM ?
5.
Pipet 2.00 mL of
SPADNS Reagent into
each cell. Swirl to mix.
Note: SPADNS Reagent is
toxic and corrosive; use
care while measuring. Use
a pipet filler.
Note: The SPADNS
Reagent must be measured
accurately.
* Adapted from Standard Methods for the Examination of Water and Wastewater. The procedure for this instrument
uses an alternate wavelength outside the accepted 550-580 nm range. The reagents used are the same as those in
the USEPA accepted method.
-
)
(Reagent Solution or AccuVac Ampuls)
2.
Press:
27 ENTER
The display will show
mg/L, F and the
ZERO icon.
6.
Press:
TIMER ENTER
A one minute reaction
period will begin.
For water, wastewater and seawater
3.
Pipet 10.0 mL of
sample into a dry 10-mL
sample cell (the
prepared sample).
7.
When the timer
beeps, place the blank
into the cell holder.
Tightly cover the sample
cell with the
instrument cap.
169
Method 8029
4.
Measure 10.0 mL of
deionized water into a
second dry sample cell
(the blank).
Note: The sample and
blank should be at the same
temperature (±1 °C).
Temperature adjustments
may be made before or
after reagent addition.
8.
Press:
ZERO
The cursor will move to
the right, then the
display will show:
0.00 mg/L F