GB/T 223.4-2008Alloyed steel - Determination of manganese content - Potentiometric or visual titration method (English PDF)

1 Scope

This section provides the determination of manganese content by potentiometric titration or visual titration.

This section applies to steel in order to determine the mass fraction of 2% to 25% manganese content.

Vanadium, cerium interference measurement results. If the sample is less than 0.01% cerium or vanadium content is less than 0.005%, the interference can be ignored. in case

Samples or cerium content greater than 0.01% vanadium content greater than 0.005%, the theoretical value correction.

2 Normative references

The following documents contain provisions which, through reference in this text, constitute provisions of this part. For dated references, subsequent

Amendments (not including errata content) or revisions do not apply to this section, however, encourage the parties to this part of the research agreement

Whether the latest versions of these documents. For undated reference documents, the latest versions apply to this section.

GB/T 6379.1 measurement methods and results of Accuracy (trueness and precision) --- Part 1. General principles and definitions

GB/T 6379.2 measurement methods and results of Accuracy (trueness and precision) --- Part 2. Determine weight standard measurement method

Refolding and basic methods of reproduction

GB/T 20066 Steel and iron - Sampling and determination of chemical composition of the preparation of samples (GB/T 20066-2006ISO 14284 with.

1996, IDT)

ISO 385-1 Laboratory glassware Burettes --- --- - Part 1. General requirements

ISO 648 Laboratory glassware --- single reticle pipette

ISO 1042 laboratory glassware --- single reticle flask

ISO 3696 for analytical laboratory use specifications and test methods ---

ISO 4942 Determination of vanadium content in steel --- --- N-BPHA spectrophotometry

ISO 4947 Determination of vanadium content in steel --- --- potentiometric titration

ISO 5725-3 measurement methods and results of Accuracy (trueness and precision) --- Part 3. standard methods of measurement precision

Intermediate measure

ISO 9647 Determination of vanadium content in steel --- --- flame atomic absorption spectrometry

Principle 3

Sample with a suitable acid dissolved, add phosphoric acid. In the micro-phosphate smoking status, with ammonium nitrate to manganese oxide to trivalent. In N- benzene on behalf o

Amino acid as indicator, with ferrous ammonium sulfate standard solution visual titration of trivalent manganese, or potential drop of ferrous ammonium sulfate standard solution set. If the sample containing vanadium, cerium, manganese response correction.

4 Reagents

Analysis, unless otherwise stated, use only two water recognized analytical reagent and ISO 3696 requirements.