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MANGANESE, LR,
4.
Pour 25 mL of
demineralized water
into a sample cell (the
blank).
Note: Rinse all
glassware with 1:1
Nitric Acid Solution.
Rinse again with
demineralized water.
continued
5.
Pour 25 mL of
sample into another
sample cell (the
prepared sample).
Note: For proof of
accuracy, a 0.5 mg/L
standard solution
(preparation given in
the Accuracy Check)
can be used in place of
the sample.
55-44
6.
Add the contents
of one Ascorbic Acid
Powder Pillow to each
cell. Cap and invert
several times to mix.
Note: For samples
containing appreciable
hardness (greater than
300 mg/L CaCO
), add
3
ten drops of Rochelle Salt
Solution to the sample
after addition of the
Ascorbic Acid Powder
Pillow.
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