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AS 4969.7-2008
[Current]Analysis of acid sulfate soil — Dried samples — Methods of test, Method 7: Determination of chromium reducible sulfur (SCR)
This Standard specifies a method for the determination of chromium reducible sulfur (SCR) by iodometric titration of distilled hydrogen sulfide trapped as zinc sulfide.
Published: 30/06/2008
Pages: 7
Table of contents
Cited references
Content history
Table of contents
Header
About this publication
Preface
1 Scope
2 Referenced documents
3 Definitions
4 Principle
5 Reagents
5.1 General
5.2 Chromium powder
5.3 Ethanol 95% solution
5.4 Hydrochloric acid (ρ20) solution 1.16 g/mL
5.5 Hydrochloric acid solution, 6 M
5.6 Iodine solution, 0.0125 M (standardized)
5.7 Nitrogen gas
5.8 Sodium hydroxide solution, 6 M
5.9 Sodium thiosulfate solution, 0.0250 M (standardized)
5.10 Starch indicator solution
5.11 Zinc acetate/2.8% ammonia solution (trapping solution)
6 Apparatus
6.1 General
6.2 Burette
6.3 Double-necked digestion flask
6.4 Electronic balance
6.5 Erlenmeyer flask
6.6 Heating mantle or electric hotplate
6.7 Pasteur pipette, glass
6.8 Pressure equalizing funnel
6.9 Reflux condenser
7 Procedure
8 Calculation
9 Precision
10 Test report
Cited references in this standard
Content history
DR 06353
AS 4969.7-2008 REC:2018
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