AS 3550.3-1992

Waters Determination of alkalinity - Acidimetric titration method

Standards Australia

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1 - AS 3550.3-1992 WATERS - DETERMINATION OF ALKALINITY-ACIDIMETRIC TITRATION METHOD
4 - PREFACE
4 - CONTENTS
4 - FOREWORD
5 - 1 SCOPE
5 - 2 REFERENCED DOCUMENTS
5 - 3 PRINCIPLE
5 - 4 REACTIONS
5 - 5 REAGENTS AND MATERIALS
5 - 5.1 General requirements
5 - 5.2 Solutions
5 - 5.2.1 Nitric acid
5 - 5.2.2 Sodium thiosulfate
5 - 5.2.3 Standard sodium carbonate solution
5 - 5.2.4 Standard hydrochloric acid
6 - 5.2.5 Standard hydrochloric acid
6 - 5.2.6 Phenolphthalein
6 - 5.2.7 Mixed indicator
6 - 6 APPARATUS
6 - 6.1 Glassware
6 - 6.2 Electrometric titrator
6 - 7 SAMPLING AND SAMPLES
6 - 7.1 General
6 - 7.2 Container
6 - 7.3 Sample storage
6 - 8 PROCEDURE
6 - 8.1 Potentiometric titration to preselected pH
6 - 8.1.1 Using potentiometric titration
6 - 8.1.2 Potentiometric titration of low alkalinity
6 - 8.2 Titration using indicators
7 - 9 CALCULATION AND EXPRESSION OF RESULTS
7 - 9.1 Calculation
7 - 9.2 Alkalinity relationships
8 - 9.3 Expression in other units
8 - 10 PRECISION
8 - 11 TEST REPORT

Abstract

Sets out a method for use where the alkalinity is in the range 1 mg/L at 2500 mg/L (expressed as CaCo(sub)3(/sub)) under the conditions of test.

Scope

This Standard sets out a titrimetric method for the determination of alkalinity in waters. This method is applicable to waters where the alkalinity is in the range 1 mg/L to 2500 mg/L (expressed as CaCO3) under the conditions of test.
NOTE: The method is subject to interference from soaps, oily matter, suspended solids or precipitates which may coat the glass electrode of the pH meter and cause a sluggish response. These interfering substances may also cause difficulty in detecting the indicator end-point.