BS ISO 418:2001
Current
The latest, up-to-date edition.
Photography. Processing chemicals. Specifications for anhydrous sodium sulfite
Hardcopy , PDF
English
25-01-2002
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Foreword
Introduction
1 Scope
2 Normative references
3 General
3.1 Physical properties
3.2 Hazardous properties
3.3 Storage
4 Requirements
5 Reagents and glassware
6 Sampling
7 Test methods
7.1 Assay
7.2 Mass fraction of insoluble matter (as a precipitate
of calcium, magnesium and ammonium hydroxides)
7.3 Mass fraction of heavy metals
7.4 Mass fraction of iron
7.5 Alkalinity (as Na2CO3)
7.6 Reaction to ammoniacal silver nitrate
7.7 Mass fraction of thiosulfate (as Na2s2O3)
7.8 Appearance of solution
Table 1 - summary of requirements
Establishes criteria for the purity of photographic grade anhydrous sodium sulfite. Coverage includes: physical properties, hazardous properties, procedure, and reagents and glassware. Also specifies the tests to be used to determine the purity.
| Committee |
CPW/42
|
| DevelopmentNote |
Supersedes 99/703571 DC (02/2002) Reviewed and confirmed by BSI, August 2016. (07/2016)
|
| DocumentType |
Standard
|
| Pages |
16
|
| PublisherName |
British Standards Institution
|
| Status |
Current
|
| Supersedes |
This International Standard establishes criteria for the purity of photographic-grade anhydrous sodium sulfite and specifies the tests to be used to determine the purity.
| Standards | Relationship |
| ISO 418:2001 | Identical |
| ISO 10349-5:1992 | Photography — Photographic-grade chemicals — Test methods — Part 5: Determination of heavy metals and iron content |
| ISO 10349-1:2002 | Photography Photographic-grade chemicals Test methods Part 1: General |
| ISO 10349-7:1992 | Photography — Photographic-grade chemicals — Test methods — Part 7: Determination of alkalinity or acidity |
| ISO 10349-9:1992 | Photography — Photographic-grade chemicals — Test methods — Part 9: Reaction to ammoniacal silver nitrate |
| ISO 10349-3:1992 | Photography — Photographic-grade chemicals — Test methods — Part 3: Determination of matter insoluble in ammonium hydroxide solution |
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