Sodium sulphate for industrial use — Determination of acidity or alkalinity
Relates to the analysis of a possible excess of acidity or alkalinity. Detection by dissolution of a test portion in water. Addition of a known excess of standard volumetric suphuric acid solution in the presence of methyl red. Elimination of the carbon dioxide by boiling. Titration of the excess of acid with standard volumetric sodium hydroxide solution. Calculation expressed as sulphuric acid…
Éléments standard pour la construction des machines-outils — Entraînement par tenon et brides de fix...
La présente Norme Internationale fixe les dimensions de l'entraînement par tenon et des brides de fixation de têtes multibroches sur des éléments standard tels que :
unités de perçage à fourreau,
unités de perçage à fourreau et à chariot réglable pour changement d'outils.
Nitric acid for industrial use — Determination of sulphate content — Method by reduction and titrime...
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…
Ammonium nitrate for industrial use — Determination of content of sulphur compounds — Method by redu...
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…
Ammonium nitrate for industrial use — Determination of ammoniacal nitrogen content — Titrimetric met...
Based on dissolution of a test sample in water. Distillation of the ammonia after displacement by an alkali solution. Absorption in an excess of standard volumetric sulphuric acid solution and back-titration with standard volumetric sodium hydroxide solution in the presence of methyl red/methylene blue mixed indicator. A typical distillation apparatus is shown in a figure.
Ammonium nitrate for industrial use — Determination of total nitrogen content — Titrimetric method a...
Based on the conversion of nitrate into ammonia by means of Devarda's alloy in alkaline solution together with the liberation of ammonia from ammonium ions. Distillation of the ammonia from both reactions, absorption in an excess of standard volumetric sodium hydroxide solution in the presence of methyl red/methylene blue mixed indicator. A typical distillation apparatus is shown in a figure.
Milk and dried milk, buttermilk and buttermilk powder, whey and whey powder — Determination of phosp...
Can be applied for the control of proper pasteurization of the products specified in the title of this standard. Uses a principle of determination based on the dilution of the liquid product or the reconstituted liquid product with a buffer at pH 10.6 containing disodium phenylphosphate and incubation at 37 degrees centigrade for 1 h. By reaction with the alkaline phosphatase present in the…
Zinc — Determination of iron content — Photometric method
The method is applicable to all zinc types provided that their copper content is 0,01 % maximum. The determination is suitable for iron contents between 0,001 and 0,01 %. This standard specifies principle, reagents, apparatus, sampling, procedure, expression of results and test report.
Ammonium sulphate for industrial use — Determination of ammoniacal nitrogen content — Titrimetric me...
Based on dissolution of a test sample in water, distillation of the ammonia after displacement by an alkali solution. Absorption in an excess of standard volumetric sulphuric acid solution and back-titration with standard volumetric sodium hydroxide solution in the presence of methyl red/methylene blue mixed indicator. A typical distillation apparatus is shown in a figure.
Heat exchangers — Verification of thermal balance of water-fed or steam-fed primary circuits — Princ...
A number of suitable arrangements of test apparatus are illustrated in the annex. ISO 3147 is applicable to tests of primary circuits performed in the steady-state condition, in accordance with the specifications laid down for each type of appliance in the relevant International Standards. Where appropriate, special arrangements required for certain types of appliance may also be given in these…
