ISO 7529:2017 PDF

Scope: This document specifies a potentiometric titration method for the determination of chromium content in nickel alloys which do not contain insoluble carbides and which have a vanadium content less than a mass fraction of 0,2 %. The method is applicable to chromium contents between a mass fraction of 5 % to a mass fraction of 22 %. Vanadium, which can be present as an impurity in the alloy, will give a positive bias interference. However, at a level of a mass fraction of 0,2 %, this bias is equivalent to a mass fraction of 0,068 % chromium, which is about half the reproducibility of the method.

ISO 7529:2017 Referenced Document

ISO 1042:1998 Laboratory glassware - One-mark volumetric flasks
ISO 385:2005 Laboratory glassware - Burettes
ISO 5725:1986 Precision of test methods; Determination of repeatability and reproducibility for a standard test method by inter-laboratory tests
ISO 648:2008 Laboratory glassware - Single-volume pipettes

2017 ISO 7529:2017 Nickel alloys - Determination of chromium content - Potentiometric titration method with ammonium iron(II) sulfate
1989 ISO 7529:1989 Nickel alloys; determination of chromium content; potentiometric titration method with ammonium iron(II) sulfate