The method consists in extraction by shaking with dimethylformamide, then after centrifuging, addition of ferric ammonium citrate and ammonia to an aliqiot part of the supernatant liquid and spectrometric determination, at 525 nm, of the absorbance of the solution thus obtained, and determing of the tannic content using a calibration curve prepared using tannic acid.
Steel and iron — Determination of nickel content — Gravimetric or titrimetric method
The method is applicable to nickel contents between 0.5 % (m/m) and 30 % (m/m). Specifies principle, reagents, apparatus, sampling, procedure, expression of results and test report. Annex A gives additional information on the international co-operative tests, and Annex B represents the precision data graphically.
Steel and iron — Determination of vanadium content — N-BPHA spectrophotometric method
The method is applicable to vanadium contents between 0.005 % (m/m) and 0.50 % (m/m). Specifies principle, reagents, apparatus, sampling, procedure, expression of results and test report. Annex A gives additional information on the international co-operative tests. Annex B includes the graphical representation of precision data.
Carbonaceous materials for the production of aluminium — Pitch for electrodes — Determination of sul...
A sample is oxidized by combustion in a bomb containing oxygen under pressure. The sulphur is gravimetrically determined in the bomb washings in the form of barium sulfate. The method is applicable to pitches of both coal ta and petroleum origin, provided that they contain at least 0,1 % (m/m) sulfur.
Applies to ferronickel lots in the form of shot as specified in ISO 6501 in those cases where lots are constituted either heat by heat or by taking from blendes stock. The purpose is to determine the contents of the various elements either from slugs by physical analysis methods or from chips by dry methods or chemical analysis.
Cheese and processed cheese products — Determination of chloride content — Potentiometric titration ...
Is applicable to all cheeses and processed cheese products containing more than 0,2 (m/m) of chloride ion. The principle is based on the suspension of a test portion in water, acidification with nitric acid and subsequent potentiometric titration of chloride ion with standard volumetric silver nitrate solution.
Manganese ores and concentrates — Determination of total iron content — 1,10-Phenanthroline spectrom...
The method is applicable to products having a total iron content from 0.1 % (m/m) to 15 % (m/m). ISO 9292 should be read in conjunction with ISO 4297. Specifies principle, reactions, reagents, apparatus, sampling and samples, procedure and expression of results.
Steel — Determination of niobium content — PAR spectrophotometric method
The method is applicable to types of steel with niobium contents between 0,005 % (m/m) and 1,3 % (m/m). Specifies principle, reagents, apparatus, sampling, procedure, expression of results and test report. Annex A includes additional information on the international co-operative tests. Annex B gives a graphical representation of precision data.
