Sulphuric acid and oleums for industrial use — Determination of ammoniacal nitrogen content — Spectr...
Applicable to products having contents of more than 0.0001 % (m/m). The procedure described is suitable for contents between 0.0001 % (m/m) and 0.0005 % (m/m). It bases on distillation, with entrainment by steam, of the ammonia in the presence of an excess of sodium hydroxide and collection of the distillate in an excess of acid solution. Neutralization of the dexcess of acid and formation of the…
Nitric acid for industrial use — Determination of ammoniacal nitrogen content — Spectrophotometric m...
Applicable to products containing more than 0.0001 % (m/m) of ammoniacal nitrogen. The procedure described is siutable for contents between 0.0001 % (m/m) and 0.0005 % (m/m). The principle of the analysis consists in distillation, with entrainment by steam, of the ammonia in the presence of an excess of sodium hydroxide and collection of the distillate in an excess of acid solution.…
Meat and meat products — Determination of total phosphorus content (Reference method)
The method consists in mineralizing of a test portion with sulphuric and nitrit acids, precipitating of the phosphorus as quinoline phosphomolybdate, drying and weighing of the precipitate. An alternative method of mineralizing is described in clause 10.
Ammonium sulphate for industrial use — Determination of iron content — 2,2'- Bipyridyl photomet...
Applicable to Fe contents of equal to or more than 0.0001 % (m/m). The reaction bases on the reduction of iron(III) by hydroxylammonium chloride. Formation of the complex between iron(II) and 2,2'-dipyridyl in a buffered medium (pH value between 4.5 and 6). Photometric measurement of the coloured complex at a wavelength of about 522 nm. Has also been approved by the IUPAC.
Oil of Australian Eucalyptus, 80 to 85 % cineole content
The Standard specifies the following characteristics of the oil. Appearance: Clear, mobile liquid. Colour: Colourless to pale yellow. Odour: Characteristic of the odour of 1,8-cineole. Relative density at 20/20 °C: 0,918 - 0,928. Refractive index at 20 °C: 1,4580 - 1,4650. Optical rotation at 20 °C: Range from - 2 to + 2 . Solubility in 70 % (V/V) ethanol at 20 °C: 1 volume in 3 volumes. Cineole…
The Standard specifies the following characteristics of the oil. Appearance: Clear, mobile liquid. Colour: Dark brown. Odour: Resembling eugenol. Relative density at 20/20 °C: 0,943 - 0,984. Refractive index at 20 °C: 1,5050 - 1,5170. Phenols content: Minimum 50 % (V/V).
