Calcium Hardness
Titration Analytical Procedure
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Sample
: 10 mL/20 mL/50 mL/100 mL
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Add
exactly 2 mL Buffer (460-SO279), Swirl to mix (Colour : Colourless).
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Add
Indicator (460-SO280), Swirl to mix
(Colour : Red).
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Titration
with Titrant High Range (460-SO274)
until colour change from Red to Violet.
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Sample
water used = 10 mL,
The result (ppm CaCO3) = Titrant used x 100
Sample water used = 20 mL, The result (ppm CaCO3) = Titrant used x 50
Sample water used = 50 mL,
The result (ppm CaCO3) = Titrant used x 20
Sample water used = 100
mL, The result (ppm CaCO3) = Titrant used x 10