Wood — Determination of radial and tangential shrinkage
Specifies a method which determines the linear dimensions 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 wall of wood.
Should be read in conjunction with ISO 4297. Specifies principle, reagents, apparatus, sample, procedure and expression of results. A figure gives an example of apparatus.
Condensed phosphates for industrial use (including foodstuffs) — Determination of calcium content — ...
Applicable to products having Ca contents equal to or more than 50 mg/kg. The presence of soluble SiO2 up to 5 g/ml in the test solution does not interfere. Hydrolysis by boiling a test portion in hydrochloric acid medium. Addition of sodium ions, until a constant concentration is obtained, to stabilize the promotion and emission of Ca; addition of lanthanum chloride to increase the sensitivity…
Acetic acid for industrial use — Methods of test — Part 4: Determination of acetaldehyde monomer con...
The principle of the determination consists in reaction of the acetaldehyde present in a test portion with an excess of sodium hydrogen sulphite solution, and iodometric titration of the residual sodium hydrogen sulphite. The method is applicable to products having acetaldehyde monomer contents equal to or greater than 0,01 % (m/m). This International Standard as also been approved by the…
Acetic acid for industrial use — Methods of test — Part 5: Determination of total acetaldehyde conte...
The method specified consists in heating a test portion in an acid medium to depolymerize any to paraldehyde present and to entrain, by distillation, both regenerated acetaldehyde and the monomeric acetaldehyde originally present. Reaction of the acetaldehyde in the distillate with an excess of sodium hydrogen sulphite solution. Iodometric titration of the residual sodium hydrogen sulphite…
Acetic acid for industrial use — Methods of test — Part 8: Visual limit test for inorganic chlorides
Specifies a method for a visual comparison of the tubitity obtained by adding a silver nitrate solution to a solution of a test portion acidified with nitric acid, with that similary obtained from a chloride solution of known concentration. Using a test portion of 50 g, the method is applicable directly to products having inorganic chloride contents in the range 0,0005 % (m/m) to 0,05 % (m/m).…
