Copper alloys — Determination of aluminium as alloying element — Volumetric method
This method is applicable to all types of copper alloys listed in ISO publications. This method determines aluminium by chelatometric titration at a pH value of about 6, following a sodium fluoride demasking procedure, and using a voltametric indication. ISO 3110 specifies principle, reagents, apparatus, sampling, procedure, expression of results and test report.
Phosphoric acid for industrial use — Determination of arsenic content — Silver diethyldithiocarbamat...
Applicable to products having As contents of more than 0.1 mg/kg. Relates to the method of analysis according to ISO 2590. Reduction of the As by zinc in a hydrochloric acid solution with the formation of arsine. Absorption of the arsine in a solution of silver diethyldithiocarbamate in pyridine. Photometric measurement of the purplish-red colour produced by the colloidally dispersed silver at…
Sodium sulphate for industrial use — Determination of iron content — 1,10- Phenanthroline photometri...
Applicable to products the Fe content of which is equal to or more than 0.0003 % (m/m). Dissolution of the test sample in delute hydrochloric acid and bromine water by heating. Preliminary reduction of the iron(III) by hydroxylammonium chloride. Formation of the iron(II)-1,10-phenanthroline complex in a buffered medium. Photometric measurement of the coloured complex at a wavelength of about 510…
Ammonium nitrate for industrial use — Determination of content of sulphur compounds — Method by redu...
Applicable to products the content of which, expressed as sulphate, is equal to or more than 0.0005 % (m/m). Heating of a test portion in the presence of sodium carbonate, in a fume-cupboard, until the ammonium salts have been eliminated (about 300 °C). Reduction of the sulphureous residue to sulphides by a mixture of hydriodic acid and hypophosphorus acid. Absorption of the hydrogen sulphide…
Ammonium sulphate for industrial use — Determination of copper content — Zinc dibenzyldithiocarbamat...
Applicable to products of which the Cu content is more than 0,1 mg/kg. The detection bases on the formation of a coloured complex of copper and of zinc dibenzyldithiocarbamate and photometric measurement at a wavelength of about 435 nm.
Crude sodium borates for industrial use — Determination of total titanium content — Photometric meth...
Applicable to products having contents up to 0.1 % (m/m). The method specified is not applicable in the presence of vanadium or high silica content. Molybdenum and chromium also interfere. The analysis bases on fusion of a test portion with sodium corbonate, extraction of the cooled melt with suphuric acid and the addition of hydrogen peroxide. Photometric measurement of the yellow coloured…
Sodium hydroxide for industrial use — Determination of chlorides content — Photometric method
Applicable to products having contents, expressed as chlorine, between 2 mg/kg and 50 mg/kg. For contents exceeding 50 mg/kg the method specified in ISO 981 shall be used. The principle consists in the quantitative displacement of the thiocyanate ions of the mercury(II) thiocyanate by the cloride ions contained in the test portion. Reaction of the thiocyanate ions with iron(III) nitrate to form…
Potassium hydroxide for industrial use — Determination of chlorides content — Photometric method
Applicable to products having contents, expressed as chlorine, between 2 mg/kg and 50 mg/kg. For contents exceeding 50mg/kg the method specified in ISO 992 shall be used. The principle consists in quantitative displacement of the thiocyanate (SCN- ) ions of the mercury(II) thiocyanate by the cloride (Cl- ) ions contained in the test portion. Reaction of the thiocyanate ions with iron(III) nitrate…
Direct current amplifiers; characteristics and test methods
Applicable to direct current amplifiers used in nuclear instrumentation to measure very light currents, ranging from about 10-6 A to 10-14 A, as produced, for instance, by very high impedance sources such as ionizing chambers. Special definitions. Functional characteristics. Test methods for the verification of compliance with specifications.
Sodium hydroxide for industrial use — Determination of iron content — 1,10- Phenanthroline photometr...
Specifies a method that is more sensitive and more widely used than the 2,2'-bipyridyl method. It is applicable to products having iron contents equal to or greater than 0.5 mg/kg. The principle is based on the reduction of trivalent iron by hydroxylammonium chloride, formation of a bivalent iron/1,10-phenanthroline complex in a buffered system. Photometric measurement of the coloured…
