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.
Hardmetals — Chemical analysis by flame atomic absorption spectrometry — Part 1: General requirement...
Subsequent parts of ISO 7627 specify methods for determination of the content of a number of elements (see the table). The method is applicable to cabides of chromium, niobium, tantalum, titanium, tungsten, vanadium, mixtures of these carbides and binder metals, all grades of presintered or sintered hardmetals, produced from these cabides, and coated hardmetals, after total removal of coating,…
Hardmetals — Chemical analysis by flame atomic absorption spectrometry — Part 2: Determination of ca...
General requirements concerning the field of application, principle, interfering elements,aparatus, sampling and test report are given in ISO 7627-1. In low concentrations the determination of these elements is very critical.
Hardmetals — Chemical analysis by flame atomic absorption spectrometry — Part 5: Determination of co...
General requirements concerning the field of application, principle, interfering elements, apparatus, sampling and test report are given in ISO 7627-1.Determination of element contents in high concentration by the atomic absorption spectrophotometry method yields a wider scattering of results than are obtainable by other methods.
