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| Название (рус.): | Кислота азотная техническая. Определение содержания сульфатов. Метод восстановления и титриметрия |
| Название (англ.): | Nitric acid for industrial use; Determination of sulphate content; Method by reduction and titrimetry |
| Описание (англ.): | Applicable to products the SO4 content of which is equal to or more than 0.0001 % (m/m). Heating of a test portion to dryness in the presence of sodium carbonate. 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 with standard volumetricmercury(II) acetate solution in the presence of dithizone as indicator. A typical apparatus for reduction and distillation is shown in a figure. |
| Дата регистрации: | 20.07.75 |
| Дата введения: | 01.07.75 |
| Дата отмены: | 30.05.02 |
| Код КГС: | Л19 |
| Код ОКСТУ: | 2121;2109 |
| Код ОКС(МКС): | 71.060.30 |
| Код ОКП: | 2121;2109 |
| Нормативные ссылки: | NBN T 03-042-1979, EQV*NF T20-263-1969, EQV*NF T20-287-1982, EQV*NP-1276-1976, EQV |
| Ключевые слова: | CHEMICAL ANALYSIS CHEMICAL ANALYSIS AND TESTING DETERMINATION OF CONTENT NITRIC ACID REDUCTION METHODS SULPHATES VOLUMETRIC ANALYSIS CHEMICAL ANALYSIS AND TESTIN |
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