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| Название (рус.): | Кислота фосфорная техническая. Определение содержания высших растворимых сульфатов. Титриметрический метод после восстановления |
| Название (англ.): | Phosphoric acid for industrial use; Determination of higher soluble sulfate contents; Titrimetric method after reduction |
| Описание (англ.): | The sulphate present in a test portion is reduced to sulphide by a mixture of hydriodic and phosphinic (hypophosphorous) acids. The hydrogen sulphide evolved is absorbed in an excess of cadmium acetate solution. The cadmium sulphide formed is oxidized by an excess of standard volumetric potassium iodate/iodide solsution, and the excess iodine is titrated with standard volumetric sodium thiosulphatesolution, using starch as indicator. The method is applicable to products having sulphate contents between 0.2 and 6 % (m/m). |
| Дата регистрации: | 01.02.84 |
| Дата введения: | 01.10.83 |
| 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 03-273-1985, EQV*NF T20-469-1984, EQV |
| Ключевые слова: | CHEMICAL ANALYSIS CHEMICAL ANALYSIS AND TESTING DETERMINATION OF CONTENT INDUSTRIAL PRODUCTS PHOSPHORIC ACID PHOSPHORIC ACIDS PHOSPHORUS INORGANIC COMPOUNDS REDUCTION METHODS SOLUBLE MATTER SULPHATES TITRATION PHOSPHORUS IN CHEMICAL ANALYSIS AND TESTIN |
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