W-000.17.031 [2021-03] Calcium in Water, Complexometric Determination with EDTA
Application/Purpose
This method describes the complexometric determination of calcium in water.
Scope of Application
Water intended for use as an ingredient in the production of beer (brewing liquor) or other foods
Calcium ions (like magnesium ions) are present in all natural sources of water in greater or lesser concentrations and constitute hardness.
Principle
Calcium ions are bound by the disodium salt of ethylenediaminetetraacetic acid (EDTA) as water-soluble chelates (undissociated complexes). Calconcarboxylic acid serves as an indicator due to its specificity for calcium ions.
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