WLN-CM.W.11.2	Determination of the hardness, calcium hardness and magnesium hardness	in-house method
Principle:	Of water samples the calcium and/or magnesium content is determined.Next by means of a calculation the total hardness, calcium hardnessand magnesium hardness are determined.
Determination:	Total hardness calculated
Performance characteristics:
Matrices qualified by the Dutch RvA:	Drinking water, Groundwater, Surface water
Reporting limit:	0.1 mmol/l, matrix dependent
Sustainability:	30 days

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