How can a water hardness test be used to determine the concentration of calcium and magnesium separately?

Document ID

Document ID TE297

Version

Version 3.0

Status

Status Published

Published Date

Published Date 08/07/2018
Question
How can a water hardness test be used to determine the concentration of calcium and magnesium separately?
Summary
Determining calcium and magnesium separately from a hardness test
Answer
Both a Calcium Hardness and Total Hardness test must be performed on the water sample.
1. Multiply the mg/L as CaCO3 Calcium hardness result by 0.400 to obtain mg/L as Calcium.
2. Subtract the Calcium hardness result from the Total hardness result to determine the mg/L as CaCO3 Magnesium hardness result.
3. Multiply the mg/L as CaCO3 Magnesium hardness result by 0.243 to obtain mg/L as Magnesium.

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