Hach DR/850, Руководство по процедурам, Страница: 177 / 460

177
Method 10225
FLUORIDE
(0 to 2.00 mg/L F
-
) For water, wastewater and seawater
SPADNS 2 Method
*
(Reagent Solution or AccuVac Ampuls)
Using SPADNS 2 Reagent Solution
* Adapted from Standard Methods for the Examination of Water and Wastewater. Per USEPA Rules and
Regulations at 40 CFR 136.6, Method Modifications and Analytical Requirements, Hach Method 10225
(SPADNS 2) for the determination of fluoride in water is equivalent to the EPA Reference Method SM 4500-F D.
Equivalency data is available upon request.
1.
Enter the stored
program number for
fluoride (F
–
) powder
pillows.
Press:
PRGM
The display will show:
PRGM ?
2.
Press:
27 ENTER
The display will show
mg/L, F and the
ZERO icon.
3.
Pipet 10.0 mL of
sample into a dry 10-mL
sample cell (the
prepared sample).
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.
5.
Pipet 2.00 mL of
SPADNS 2 Reagent into
each cell. Swirl to mix.
Note: SPADNS 2 Reagent
is corrosive; use care while
measuring. Use a pipet
filler.
Note: The SPADNS 2
Reagent must be measured
accurately.
6.
Press:
TIMER ENTER
A one minute reaction
period will begin.
7.
When the timer
beeps, place the blank
into the cell holder.
Tightly cover the sample
cell with the
instrument cap.
8.
Press:
ZERO
The cursor will move to
the right, then the
display will show:
0.00 mg/L F