Hach DR/700 Procedures Manual page 493

MANGANESE, LR,
7.
Add 1.0 mL of
Alkaline-Cyanide
Reagent Solution to
each cell. Swirl to
mix.
Note: A cloudy or turbid
solution may form in
some samples after
addition of the Alkaline-
Cyanide Reagent
Solution. The turbidity
should dissipate after
Step 8.
continued
8.
Add 1.0 mL of
0.1% PAN Indicator
Solution to each
sample cell. Cap and
invert several times to
mix.
Note: An orange color
will develop if
manganese is present.
Note: Use plastic
dropper supplied
because droppers with
rubber bulbs may
contaminate solution.
55-45
2 minutes
9.
Wait 2 minutes.
Note: If sample contains
high amounts of iron
(greater than 5 mg/L),
allow 10 minutes for
complete color
development.