---
title: "ASTM D511"
url: "https://mat-cs.com/astm-d511/"
description: "These test methods cover the determination of calcium and magnesium in water by complexometric titration and atomic absorption spectrometric procedures."
---

ASTM Standard

# ASTM D511

Standard Test Methods for Calcium and Magnesium In Water

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## Significance and Use

4.1 Calcium and magnesium salts in water are the primary components of water hardness which can cause pipe or tube scaling.

## Scope

1.1 These test methods cover the determination of calcium and magnesium in water by complexometric titration and atomic absorption spectrometric procedures. Two test methods are included, as follows:

Sections

Test Method A—Complexometric Titration

7 – 15

Test Method B—Atomic Absorption Spectrometric

16 – 25

1.2 The values stated in SI units are to be regarded as standard. The values given in parentheses are mathematical conversion to inch-pound units that are provided for information only and are not considered standard.