Hach DR/700 Procedures Manual page 318

VOLATILE ACIDS,
3 minutes
7.
Wait 3 minutes.
10.
Pipet 2.0 mL of
4.5 N Sodium
Hydroxide Solution
into each cell. Swirl
to mix.
continued
8.
Cool solutions to
o
25 C (until the cell
feels cold) with
running tap water.
11.
Add 10 mL of
Ferric Chloride
Sulfuric Acid
Solution to each cell.
Swirl to mix.
50-68
9.
Pipet 0.5 mL of
Hydroxylamine
Hydrochloride
Solution into each
cell. Swirl to mix.
12.
Add 10 mL of
demineralized water
to each cell. Swirl to
mix.