Standard Methods: 2340B: Hardness in Water by Calculation

Official Method Name

Hardness in Water by Calculation

Current Revision

Standard Methods Online

Media

WATER

Instrumentation

Not Applicable

Method Subcategory

Inorganic

Method Source

Standard Methods

Citation

Standard Methods Online - Standard Methods for the Examination of Water and Wastewater

Brief Method Summary

Hardness is calculated from the separate determinations of calcium and magnesium.

Scope and Application

This method is applicable to all waters. Polluted waters and wastewater samples must be pretreated. See abstract in Method 3030.

Applicable Concentration Range

Method is suitable for all concentration levels.

Interferences

Quality Control Requirements

Sample Handling

Maximum Holding Time

Relative Cost

Unknown

Sample Preparation Methods

This method has 1 analyte associated with it.

Analyte	Detection Level	Bias	Precision	Pct False Positive	Pct False Negative	Spiking Level
Hardness(E-11778) Calcium hardness Hardness Hardness, total Total hardness	N/A	N/A	N/A

Precision Descriptor Notes:
Detection Level Note:	Calculation of hardness from calcium and magnesium is more accurate than EDTA titration and is the preferred method.

Revision	PDF/Link
Standard Methods Online
Standard Methods 18th, 19th, 20th ed.

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