ISO 9647-2020 pdf free.Steel — Determination of vanadiumcontent—Flame atomic absorptionspectrometric method (FAAS).
1.Scope:This document specifies a flame atomic absorption spectrometric method(FAAS) for the determinationof the vanadium content in steel.
The method is applicable to vanadium contents between 0,01 % (mass fraction) and 0,80 %(massfraction), provided that the tungsten content in a 1,0 g test portion is not higher than 1,0 % and/or thetitanium content is not higher than 0,5 %.
2.Normative references:The following documents are referred to in the text in such a way that some or all of their contentconstitutes requirements of this document. For dated references, only the edition cited applies. Forundated references, the latest edition of the referenced document (including any amendments) applies.ISO 648,Laboratory glassware – Single-volume pipettes.ISO 1042,Laboratory glassware — One-mark volumetric flasks
ISO 3696,Water for analytical laboratory use — Specification and test methods
ISO 14284,Steel and iron — Sampling and preparation of samples for the determination of chemicalcomposition
3.Terms and definitions:No terms and definitions are listed in this document.
4.Principle:Dissolution of a test portion in hydrochloric, nitric and perchloric acids.Addition of an aluminium chloride solution as spectrochemical buffer.Nebulisation of the test solution into an acetylene/nitrous oxide flame of an atomic absorptionspectrometer.
Spectrometric measurement of the atomic absorption of the 318,4 nm spectral line emitted by avanadium hollow-cathode lamp.
NOTE Other suitable radiation sources can also be used.
5.Reagents:During the analysis,unless otherwise specified, use only reagents of recognized analytical grade andonly grade 2 water as specified in IS0 3696.
Cover with a watch glass and if necessary, heat gently to assist dissolution.When dissolution is completeevaporate the solution to just before dryness and add 20 ml of hydrochloric acid (5.2).
Allow to cool to room temperature and transfer the solution quantitatively into a 500 ml one-markvolumetric flask. Dilute to the mark with water and mix.1 ml of this solution contains 2,0 mg of vanadium.
Dry several grams of ammonium metavanadate(NH Vo3) (purity >99,9 %] in an oven at 100 C to105°C for at least one hour and allow to cool to room temperature in a desiccator.NOTE A drying temperature over 110 C will cause decomposition of ammonium metavanadate.Keepstrictly to the drying temperature specified.Weight 2,296 g of the dried product into a 600 ml beaker, add about 400 ml of hot water and gentlysimmer to dissolve.Allow to cool, transfer the solution quantitatively into a 500 ml one-mark volumetric flask. Dilute to themark with water and mix.1 ml of this solution contains 2,0 mg of vanadium.ISO 9647 pdf download.