Magnesium and its alloys — Determination of nickel — Photometric method using dimethylglyoxime
The method is applicable to the determination of nickel contents between 0,000 5 and 0,05 % (m/m). Specifies principle, reagents, apparatus, sampling, procedure, expression of results and test report.
Washing powders — Determination of active oxygen content — Titrimetric method
The determination consists in co-reduction, with liberation of oxygen, of the peroxyhydrate and potassium permanganate in an acid solution. Because of the specifity of washing powders and the relative stability of peroxyhydrates, the dissolution of washing powders is likely to be incomplete and may result in a loss of oxygen; these disadvantages have been avoited by adoption of a particular…
Soaps — Determination of chlorides content — Potentiometric method
The method is carried out as follows: Potentiometric titration of the chloride ions with standard volumetric silver nitrate solution in a nitric acid medium, using a silver-silver chloride measurement electrode and a calomel reference electrode.
Plastics — Determination of apparent density of material that can be poured from a specified funnel
Specifies a method for the determination of the apparent density of a moulding powder or a granular material. The sample is pured through a specified funnel into a measuring cylinder of 100 cubiccentimeter capacity, the excess is removed with a straightedge and the mass of the contents is determinded by weighing. Expression of the apparent density in grams per millilitre.
Starches, native or modified — Determination of total fat content
Hydrolysis of the product by boiling hydrochloric acid, and coagulation of the insoluble products by cooling. Separation by filtration, drying and isolation the wanted matter by solvent extraction. The method applies to contents less than 1,5 % (m/m).
This method gives three procedures for the analytical
determination of the amount of metallic copper present in textile
materials. The choice of method will depend on the content of
copper in the sample, the quantity of sample available, and the
other materials present in the sample.
Plastics — Melamine-formaldehyde mouldings — Determination of extractable formaldehyde
Liquids simulating fodd and beverages are placed in contact with mouldings of the sample material, under defined conditions. The formaldehyde content of the liquid is then determined and the quantity of formaldehyde extracted per unit area of content is calculated. Two spectrophotometric methods for the determination of formaldehyde in the liquid, using chromotropic acid disodium salt or…
