ASTM D511

Calcium and Magnesium in Water

Applicability: ASTM D511 is a standard test method used to determine calcium and magnesium in water. Two test methods are included: Test Method A, complexometric titration, and Test Method B, atomic absorption spectrometry.

Purpose: The purpose of ASTM D511 is to quantify calcium and magnesium in water by complexometric titration or atomic absorption spectrometry. Calcium and magnesium salts are the primary components of water hardness, which can cause pipe or tube scaling, so results are used to assess water hardness and scaling potential.