Laboratory glassware — Thermo-alcoholometers and alcohol-thermohydrometers
The requirements specify the instruments with an incorporated thermometer for determination the alcohol content by mass or the alcohol concentration by volume of mixture of water and alcohol. Construction, materials and scale are described. The dimensions are tabled and the values of the alcohol mass content and the alcohol concentration by density and surface tension are given in a second table.
Cereals and cereal products — Determination of total fat content
The method consists in hydroyzing of a test portion by hydrochloric acid in the presence of ethanol and formic acid, after any grinding required, then extracting of the fat by hexane in a special flask, removing of the solvent and weighing the residue thus obtained.
Chlorofluorohydrocarbons for industrial use — Determination of inert gas content — Gas chromatograph...
Describes a method applicable to products having inert gas content equal to or greater than 0,005 % (V/V). The principle is based on detection of inert gas from test portion s taken from the liquid or gaseous phase and analysis under such conditions that none of the gases are retained irreversibly by the stationary phase.
Black pepper and white pepper, whole or ground — Determination of piperine content — Spectrophotomet...
Describes a method based on a number of international collaborative studies carried out over a long period of time. The method seeks to optimize a number of variables in an attempt to define procedures and provide a common measure of the pungency of pepper. The principle consists in the extraction of the pungent compounds with ethanol and spectrophotometric measurement at 343 nm.
Copper and copper alloys — Code of designation — Part 1: Designation of materials
The material designations shall be based on the chemical composition limits. All material designations shall have the prefix "ISO". International chemical symbols shall be used for the designation of the base element and the major alloying elements, followed by letters indicating the metal grade or by numbers indicating the nominal alloy content. Cast alloys shall have the prefix G.
Steel and cast iron — Determination of manganese content — Spectrophotometric method
The method is applicable to products having manganese contents between 0,001 and 4 % (m/m). Gives principle, reagents, apparatus, sampling, procedure, expression of results and test report.
Steel and cast iron — Determination of sulphur content — Combustion titrimetric method
Describes a method determining sulphur after combustion of the test portion in a current of oxygen. Specifies principle, reagents, apparatus, sampling, procedure, expression of results and test report.
This second edition cancels and replaces the first edition (i.e. ISO 316-1975). Should be read in conjunction with ISO 4297. Specifies principle, reagents, apparatus, sample, procedure and expression of results.
Instant tea — Determination of free-flow and compacted bulk densities
The method for the determination of the free-flow bulk density consists in pouring a sample from a specified funnel into a specified receptacle of known volume, and weighing the contents of the receptacle. The determination of the compacted bulk density consists in determining of the volume of a given mass of the product after a fixed number of taps (usually 100) in a jogging volumeter.
Methyl chloride for industrial use — Determination of impurities — Gas chromatographic methods
Specifies a method, the principle of which is based on the analysis of a vaporzed test portion and determination of the contents of impurities. The calibration factors used for this determination are obtained by analysis of external methyl chloride calibration mixtures containing known quantities of the impurities under consederation.
