Phenol, o-cresol, m-cresol, p-cresol, cresylic acid and xylenols for industrial use — Methods of tes...
The method is applicable to products having high cresol contents. The principle consists in distillation of a test portion inder carefully defined conditions. Either determination of the temperatures corresponding to the condensate volumes defined or determination of the volume condensate when the thermometer indicates each of the distillaton temperatures (i.e. plotting temperature as a function…
Phenol, o-cresol, m-cresol, p-cresol, cresylic acid and xylenols for industrial use — Methods of tes...
Applicable to products having a high o-cresol content and a high m-cresol content. The principle consists in distillation of a tast portion under carefully defined conditions and determination of the mass of residue obtained. The distillation is carried out according to ISO 918. When all the water has distilled over, continue the distillation without intermediate measurements, until either the…
Chromium ores and concentrates — Determination of chromium content — Titrimetric method
The method is applicable to products having a chromium content greater than 7 % (m/m). Should be read in conjunction with ISO 6629. Specifies principle, reagents, apparatus, procedure and expression of results.
Rectified oil of Eucalyptus globulus Labillardière, Portugal
The oil is classified as one of the following three types, according to the 1,8-cineole content: 70,0 to 74,9 % (m/m) of 1,8-cineole; 75,0 to 79,9 % (m/m) of 1,8-cineole; 80,0 to 85,0 % (m/m) of 1,8-cineole. For these three types descriptions and permissible values for the characteristics appearance, colour, odour, relative density at 20/20 °C, refractive index at 20 °C, optical rotation at 20 °C…
Acetic acid for industrial use — Methods of test — Part 3: Determination of formic acid content — Io...
Specifies the determination of total reducing matter and of reducing compounds other than formic acid. The principle consists in oxidation of formic acid and other reducing compounds in a test portion with an excess of sodium hypobromit solution. Determination of the excess sodium hypobromite by iodometry. Oxidation of reducing compounds other than formic acid with an excess of potassium bromide-…
Brown coals and lignites — Determination of moisture content — Indirect gravimetric method
Specifies two basic procedures: a) A single-stage method which can be used for determination of the total moisture content of the special moisture sample or of a moisture sample taken from a common sample. b) A two-stage method which can be used for determination of the residual moisture content and, if required, also the total moisture content of a special moisture sample or of a moisture sample…
Phosphoric acid for industrial use (including foodstuffs) — Determination of hydrogen sulfide conten...
The hydrogen sulphide in a test portion is removed in a stream of nitrogen and absorbed in a solution of sodiumhydroxide in aqueous acetone. the sulphide ions are titrated with standard volumetric mercury(II) acetate solution, in the presence of 1,5-diphenylthiocarbazone (dithizone) as indicator. The method is applicable to products having hydrogen sulfide contents greater than or equal to 0.05…
Phosphoric acid for industrial use — Determination of higher soluble sulfate contents — Titrimetric ...
The sulphate present in a test portion is reduced to sulphide by a mixture of hydriodic and phosphinic (hypophosphorous) acids. The hydrogen sulphide evolved is absorbed in an excess of cadmium acetate solution. The cadmium sulphide formed is oxidized by an excess of standard volumetric potassium iodate/iodide solsution, and the excess iodine is titrated with standard volumetric sodium…
Sintered metal materials, excluding hardmetals — Preparation of samples for chemical analysis for de...
Applies to the chemical determination of free or total carbon content in parts in which carbon is uniformly distributed and present in the forms shown in table 1. Combined carbon is determined as the difference between total and free carbon. The presence of carbonaceous materials in the pores or on the surface interferes with the determination of carbon, see table 2.
