Aluminium oxide primarily used for the production of aluminium — Determination of zinc content — PAN...
The 1-(2-pyridilazo)-2-naphthol method is applicable to products having zinc contents in the range between 0,002 % (m/m) and 0,12 % (m/m). Alkaline fusion of a test portion, and dissolution of the fused mass in nitric acid. Separation of the zinc in the form of its thiocyanate by extraction with 4-methylpentan-2-one. Re-extraction of the zinc with an aqueous hydrochloric acid solution. Formation…
Light olefins for industrial use — Determination of traces of water — Karl Fischer method
Describes a method applicable to products having water contents between 10 and 100 mg/kg. Specifies the manner of applications of the Karl-Fischer method, whose principle and chemical reaction are given in ISO 760 which should also be used for higher water contents as sampling is not valid when there is a risk that condensation of water may occur. The principle consists in absorbing the traces of…
Bank operations — Authorized signature lists and their representation on microfiche
Specification of size, layout and content of the master form, including graphical requirements, for autorized signatrue lists used as source documents by banks. It refers to signature lists transmitted as paper documents, and also specifies their representation on microfiche.
Fruits, vegetables and derived products — Qualitative method for the detection of sulphur dioxide
The method is applicable to products having contents of 2 mg or more per kilogram. It consists in acidification of a test portion and decolourizing by the liberated gas of a starch indicator paper previously coloured blue by a trace of iodine vapour.
Essential oils — Determination of 1,8-cineole content
The determination is carried out by measurement of the crystallization temperature of a mixture of essential oil and o-cresol. This temperature depends on the 1,8-cineole content of the essential oil. A table gives the 1,8-cineole content as a function of the crystallization temperature of the essential oil/o-cresol mixture.
Light metals and their alloys — Code of designation based on chemical symbols
The designations of metals and alloys shall be based on the chemical composition limits given in International Standards. International chemical symbols shall be used for the designation of the principal metal and the major alloying elements followed by numbers indicating the metal grade or the nominal alloy content.
The method is applicable to cereals and cereal products as well as to certain products containing less the 1 % of crude fibre. It consists in boiling with a mixture of acetic acid, nitric acid and trichloroacetic acid (after any necessary grinding and defatting). Then separation and washing of the insoluble residue on a filter crucible. Drying and weighing of the insoluble residue, and…
Soaps — Determination of content of ethanol-insoluble matter
The soap is dissolved in ethanol, filtrated and the undissolved residue is weighed. The constituents not dissolved correspond to the additives and foreign matter, of low solubility or insolubility in 95 % (V/V) ethanol, added to soaps and also to substances in all soap formulations, such as alkali carbonates and chlorides, borates, perborates, suphates, silicates, phosphates etc. It also may…
