ASTM D511-14 - 1.10.2014
 
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.

 
1. 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.

1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. Specific hazard statements are given in 12.2.6 and 20.6.

 
2. Referenced Documents

D5847-22

Standard Practice for Writing Quality Control Specifications for Standard Test Methods for Water Analysis

D5810-96(2026)

Standard Guide for Spiking into Aqueous Samples

D4841-88(2018)

Standard Practice for Estimation of Holding Time for Water Samples Containing Organic and Inorganic Constituents

D4691-17(2025)

Standard Practice for Measuring Elements in Water by Flame Atomic Absorption Spectrophotometry

D1129-24

Standard Terminology Relating to Water

D1193-24

Standard Specification for Reagent Water

D2777-21

Standard Practice for Determination of Precision and Bias of Applicable Test Methods of Committee D19 on Water

D3370-25

Standard Practices for Sampling Water from Flowing Process Streams