Sodium hexafluorosilicate for industrial use — Determination of iron content — 1,10 phenanthroline s...
Applicable to products having Fe contents between 0.0004 % (m/m) and 0.1 % (m/m). The residue from the determination of the loss of mass according to ISO 5444 is used to prepare the test sample. Decomposition of the hexafluorosilicate and elimination of silica by evaporation with hydrofluoric and sulphuric acids. Dissolution of the residue in hydrochloric acid and reduction of the iron(III) with…
Caseins and caseinates — Determination of water content (Reference method)
Is applicable to all types of caseins and caseinates. The principle consists in drying a test portion at 102 +/- 1 degree centigrade and weighing to determine the loss of mass which is expressed as a percentage by mass.
Sodium hexafluorosilicate for industrial use — Determination of phosphate content — Molybdovanadate ...
Applicable to products having contents, expressed as phosphorus pentoxide, of 0.005 % (m/m) to 0.05 % (m/m). The residue from the determination of the loss of mass according to ISO 5444 is used to prepare the test sample. Dissolution in dilute hydrochloric acid and nitric acid solutions. Formation of the yellow molybdovanadate and spectrophotometric measurement at a wavelength of about 420 nm.…
Applies to moist and air-dry pulp which does not contain any appreciable quantity of matter, other than water, volatile at the temperature specified for the drying, and is not applicable to the dry matter content of slush pulp or to the determination of the saleable mass of pulp lots.
Essential oils (containing tertiary alcohols) — Evaluation of free alcohols content by determination...
The essential oil is subjected to cold formylation by a mixture of formic acid and acetic anhydride. After formylation the ester value is determined. The free alcohols content is calculated taking into account the ester values of the same oil before formylation. Total alcohols and combined alcohols content can also be determined with this method.
