Paints and varnishes — Determination of "soluble" metal content — Part 7: Determination of...
The principle consists in oxidation of the of hte mercury compounds contained in the test solution obtained from the pigment portion of the paint or combustion with oxygen in an enclosed system of the evaporation residue of the test solution obtained from the liquid portion of water-dilutable paints. Reduction of the mercury(II) compounds to elementary mercury. Determination of the mercury, as…
Paints and varnishes — Determination of "soluble" metal content — Part 1: Determination of...
The principle of the AAS method consists in aspiration of the test solution into an acetylen/air flame. Measurement of the absorption of the selected spectral line, emitted by a lead hollow-cathode or lead discharge lamp, in the region of 283,3 nm. The principle of the dithizone method consists in extraction of the lead from the test solution with an solution of dithizone in 1,1,1-trichloroethane…
Animal and vegetable fats and oils — Determination of polyethylene-type polymers
Specifies the reference method. Below 50 mg of polymers per kilogram the presicion of the method is insufficient. The method consists in dissolving of a test portion in chloroform, after acid treatment, then filtrating through a sintered filter crucible, washing the crucible and its content, drying and weighing, followed by extraction of the polymers from the insoluble matter by boiling…
Fruits, vegetables and derived products — Determination of nitrite and nitrate content — Molecular a...
The method consists in extracting a test portion with hot water, precipitating the protein by addition of solutions of potassium hexacyanoferrate(II) and zinc acetate, and filtrating the precipitate. Further, reduction of the nitrate to nitrite by metallic cadmium (only for determining the nitrate). Then addition of sulfanilamide chloride and N-(1-naphtyl)ethylenediamine and measurement of the…
Pipes and fittings of acrylonitrile/butadiene/styrene (ABS) — General specification for moulding and...
Specifies ABS-plastics for pipe applications, the properties chosen to designate
ABS plastics for pipes are: acrylonitrile content, Vicat softening temperature,
melt flow rate, impact strength and flexural modulus. Reference is made to ISO
2580.
Manganese ores and concentrates — Determination of manganese content — Potentiometric method
The method is applicable to the determination of a manganese content equal to or greater than 15 % (m/m). ISO 4298 should be read in conjunction with ISO 4297. Specifies principle, reactions, reagents, apparatus, sampling, procedure and expression of results.
