secButyl alcohol for industrial use — List of methods of test
Specifies the sampling, the determination of distillation characteristics, of residue on evaporation, of the acidity to phenolphthalein and the measurement of colour in Hazen units. The butan-2-ol sample is stored in a dark coloured, glass-stoppered bottle of such a size that it is nearly filled by the sample.
Methyl ethyl ketone for industrial use — List of methods of test
Specifies the sampling, the determination of distillation characteristics, of the density at 20 0C, of residue on evaporation on a water bath, of the water content, of alcoholic impurities, of the acidity to phenolphthalein, the examination of residual odour and the measurement of colour in Hazen units.
Potassium sulphate for industrial use — Determination of potassium content — Flame emission spectrop...
The principle of the method consists in dissolution of a test portion previosly ground and sifted. Acidification to pH 1 after suitable dilution and atomization of the resultant solution in the burner of a flame spectrophotometer. Determination of the potassium content by measurement of the intensity of the radiation emitted at 766 nm. Comparison with the intensity of standard potassium chloride…
Potassium hydroxide for industrial use — Determination of sodium content — Flame emission spectropho...
The method is applicable to products having sodium contents greater than 0.01 % (m/m). The principle consists in the dissolution of a test portion, followed by acidification to ph value 1. Atomization of the obtained solution in the burner of a flame spectrophotometer. Measurement of the intensity of the radiation emitted at 589 nm; comparison with the intensity obtained for standard sodium…
Sulphuric acid and oleum for industrial use — Determination of lead content — Dithizone photometric ...
Applicable to the determination of contents exceeding 1 mg/kg. The principle bases on evaporation of the test portion, dissolution in hydrochloric acid and reduction by hydroxylammonium chloride. Formation of complexes of interferring elements with ammonium citrate and potassium cyanide. Extraction of the lead at a pH of between 8.5 and 10 by a solution of dithizone in chloroform. Elimination of…
Urea for industrial use — Measurement of the variation of pH in the presence of formaldehyde — Poten...
Specifies the principle of measurement, at (20 0.5) 0C, of the quantity of 0.01 N sodium hydroxide standard volumetric solution required to take the pH of a solution containing 50 g of sample in 100 ml of water to a pH of 8.3 after addition of formaldehyde. Has also been approved by the IUPAC.
Urea for industrial use — Determination of water content — Karl Fischer method
Specifies the manner in which this method is to be applied in a reaction of any water present in urea with a solution of iodine and sulphur dioxide in a mixture of pyridine and methanol (Karl Fischer reagent). This reagent is first standadized by titration with a precisely known mass of water. The end point of the reaction is read by the direct visual or direct electrometric method. The method…
Urea for industrial use — Determination of biuret content — Photometric method
Applicable to the determination in the presence of ammoniacal salts less than 15 mg in the aliquot amount taken for the determination. In the presence of quantities exceeding 15 mg the ammoniacal nitrogen shall be removed by a cation exchange resin because these salts interfere with the determination. The principle of the reaction consists in formation of a violet-red complex between allophanic…
1,1,1- Trichloroethane for industrial use — List of methods of test
Specifies the sampling, the determination of distillation characteristics, of the density at 20 0C, of residue on evaporation, of the water content, of the acidity and the measurement of colour in Hazen units. Has also been approved by the IUPAC.
