Hach DR2400 - Page 784

Volatile Acids
Volatile Acids
Page 2 of 6
VolatileAci_None_Other_ESR_Eng_Ody.fm
9. When the timer
beeps, cool the solutions
to 25 °C (until the cell
feels cold) with running
tap water.
10. Using a pipet filler,
pipet 0.5 mL of
Hydroxylamine
Hydrochloride Solution
into each cell. Swirl to
mix.
11. Using a pipet filler,
pipet 2.0 mL of 4.5 N
Sodium Hydroxide
Standard Solution into
each cell. Swirl to mix.
12. Add 10 mL of Ferric
Chloride Sulfuric Acid
Solution to each cell.
Swirl to mix.
13. Add 10 mL of
deionized water to each
cell. Cap and invert to
mix.
14. Immediately touch
the timer icon. Touch
OK.
Another three-minute
reaction period will begin.
During this time,
complete steps 15 and 16.
15. Blot each sample cell
dry. Immediately place
the blank into the cell
holder.
16. Touch Zero.
The display will show:
0 mg/L HOAC
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10 mL
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Zero