Coffee — Determination of caffeine content (Reference method)
The method consists in extracting of the caffeine from a test portion, in an ammoniacal medium, successive purifying, with diethyl ether, on two chromatographic columns, the first in an alkaline medium, the second in an acid medium, followed by elution by chloroform. Spectrometric measurement of the eluate at the wavelength of maximum absorbance (in the ultraviolet region). A first figure shows…
Phosphoric acid for industrial use (including foodstuffs) — Determination of vanadium content — Phos...
A yellow complex is formed by reaction of the vanadium present in a test portion with phosphoric acid and sodium tungstate in acid medium. The spectrometric measurement of the absorbance is carried out at a wavelength of about 425 nm. The method is applicable to products having a vanadium content equal to or greater than 3 mg/kg.
Hexafluorosilicic acid for industrial use — Determination of available fluorine content — Potentiome...
Covers a method consisting in separating the fluorine from a test portion by distillation in the presence of perchloric acid, followed by potentiometric titration of the distillate with lanthanum nitrate solution using a fluoride ion-selective electrode. Is applicable to products having total available fluorine contents in the range between 15 and 35 % (m/m).
Timber structures — Joints made with mechanical fasteners — General principles for the determination...
Applies to joints made with mechanical fasteners used in statically loaded timber structures. Covers the conditioning of test specimens and explains the apparatus to be used for measuring the geometry of the test specimens, their moisture content and other characteristics. Details the loading procedure and specifies the details to be included in the test report.
Road vehicles — World manufacturer identifier (WMI) code
Specifies the content and structure of an identifier in order to establish, on a world-wide basis, the identification of road vehicle manufacturers. This identifier is the first section of the vehicle identification number (VIN) described in ISO 3779. Applies to motor vehicles, trailers, motorcycles, and mopeds as defined in ISO 3833. This second edition cancels and replaces the first edition (…
Packaging — Sacks — Conditioning for testing — Part 1: Paper sacks
The principle consists in exposure of empty sacks to a conditioning atmosphere so that a state of temperature and moisture content equilibrium is reached between the sacks and this atmosphere. Conditioning atmospheres ar described by a table. Equipment, procedure and test report are specified.
