Acetic anhydride for industrial use — Methods of test
Gives general instructions and specifies methods of analysis. The methods to be used are determination of destillation yield, of bromine number, of arsenic content, of permanganate index, of dichromate index, the measurement of colour, titrimetric determination of acetic anhydride content, gravimetric determination of ash, spectrometric determination of phosphate content and visual limit tests…
Wood — Determination of radial and tangential swelling
Specifies a method which determines the linear swelling of test pieces after drying at a moisture content in equilibrium with the normal environment and at a moisture content, equal to or greater than the saturation point of the cellular walls of wood.
Two methods are specified: the stereometric method used for test pieces made in accordance with ISO 4859, and the mercury volumenometer method used for test pieces of any shape. Determines the change in volume of test pieces after drying, at a moisture content in equilibrium with the normal environment and at a moisture content, equal to or greater than the saturation point of the cellular walls…
Fruits, vegetables and derived products — Determination of arsenic content — Silver diethyldithiocar...
The method consists in decomposing a test portion, reducing arsenic (V) to arsenic (III) with tin(II) chloride and transforming the arsenic into arsine by action of nascent hydrogen, forming a red coloured complex by the action of the arsine on silver diethyldithiocarbamate and measuring at a wavelength of 520 nm.
Dried milk — Determination of nitrate and nitrite contents — Method by cadmium reduction and photome...
Describes a method suitable for whole, partly skimmed and skimmed milk powder. The principle of determination consists in dissolving the dried milk in water, precipitating the fat and proteins, filtering and reducing the nitrate to nitrite in a portion of the filtrate by means of copperized cadmium. The sampling shall be made as specified in ISO 707. The apparatus for nitrate reduction is shown…
Starches and derived products — Determination of chloride content — Potentiometric method
A solution or suspension of the sample is titrated with a standard volumetric silver nitrate solution. The method is not applied to cationic starches and amyloids soluble when cold.
Citrus fruits and derived products — Determination of essential oils content (Reference method)
The method consists in boiling a test portion, diluted or undiluted, and steam entrainment of the oils which are collected in a graduated tube; after cooling, direct reading from this tube of the volume of the oils separated from the destillate.
Gives general instructions and specifies methods od analysis. The methods to be used are determination of density at 20 °C, determination ofdry residue after evaporation on a water bath, measurement of colour, determination of distillation yield, determination of water content, detection of the alkalinity or acidity to phenolphthalein, spectrometric detection of content of carbonyl compounds in…
