Table of Contents

Abstract

Sets out a titrimetric method for determining the carbon dioxide content of waters in concentration range 1 to 100 mg/L.
RECONFIRMATION NOTICE
Technical Committee EV-008 has reviewed the content of this publication and in
accordance with Standards Australia procedures for reconfirmation, it has been
determined that the publication is still valid and does not require change.
Certain documents referenced in the publication may have been amended since the
original date of publication. Users are advised to ensure that they are using the latest
versions of such documents as appropriate, unless advised otherwise in this
Reconfirmation Notice.
Approved for reconfirmation in accordance with Standards Australia procedures for
reconfirmation on 15 August 2016.
The following are represented on Technical Committee EV-008:
Australasian Land and Groundwater Association
Australian Institute of Marine Science
Australian Water Association
Chem Centre
Environmental Laboratory Industry Group
EPA South Australia
Griffith University
National Association of Testing Authorities Australia
National Environment Protection and Heritage Council
Sydney Water Corporation

Scope

This Standard sets out a titrimetric method for the determination of free carbon dioxide in waters using either a coloured or potentiometric end-point.
As carbon dioxide may be present in the free form or chemically combined as carbonates or bicarbonates, a means for determining the total carbon dioxide from the concentration in all forms is provided in Appendix A. The method is applicable to waters containing free carbon dioxide in the concentration range 1 mg/L to 100 mg/L.
Interferences: Cations and anions that quantitatively disturb the normal carbon dioxide-carbonate equilibrium interfere with the determination. Aluminium, chromium, copper and iron are some of the metals whose salts contribute to high results. The iron(II) concentration should not exceed 1.0 mg/L. Positive errors are caused by amines, ammonia, borate, nitrite, phosphate, silicate and sulfide. Mineral solids and salts of strong acids and weak bases affect the determination and therefore should be absent. Negative errors may be introduced by high total dissolved solids, such as those encountered in seawater, or by adding excess indicator.

General Product Information

Published
Document Type	Standard
Status	Current
Publisher	Standards Australia
ProductNote	Reconfirmed 02/09/2016. This standard has been reconfirmed in Australia in 2016 and remains current in New Zealand. Reconfirmation Notice 02/09/2016
Pages
ISBN
Committee	EV-008
Supersedes	AS 2448-1981