ISO 3329:1975
Withdrawn
Ammonium nitrate for industrial use — Determination of content of sulphur compounds — Method by reduction and titrimetry
Hardcopy , PDF
English, French
07-01-1975
04-13-2019
Applicable to products the content of which, expressed as sulphate, is equal to or more than 0.0005 % (m/m). Heating of a test portion in the presence of sodium carbonate, in a fume-cupboard, until the ammonium salts have been eliminated (about 300 °C). Reduction of the sulphureous residue to sulphides by a mixture of hydriodic acid and hypophosphorus acid. Absorption of the hydrogen sulphide evolved in a mixture of sodium hydroxide solution and acetone. Titration of the sulphide with standard volumetric mercury(II) acetate solution in the presence of dithizone as indicator. A typical apparatus for reduction and distillation is shown in a figure.
| Committee |
ISO/TC 47
|
| DocumentType |
Standard
|
| Pages |
4
|
| PublisherName |
International Organization for Standardization
|
| Status |
Withdrawn
|
| Standards | Relationship |
| NBN T 03 054 : 1979 | Identical |
| BS 4267-9:1987 | Similar to |
| BS 4267-0:1987 | Ammonium nitrate General introduction |
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