Withdrawal of C560-20 With Replacement D8186-18 Standard Test Method for Measurement of Impurities in Graphite by Electrothermal Vaporization Inductively Coupled Plasma Optical Emission Spectrometry (ETV-ICP OES)
Rationale
Summary:
?
Determination of the elements Al, B, Ca, Fe, Si, Ti and V in graphite by photometric methods
Problems:
In general, photometryis suitable for a sensitive and accurate determination of the elements Al, B, Ca, Fe, Si, Ti and V, but:
It is an outdated method which, as far as I know, is nowadays only rarely used for the chemical analysis of graphite
It is questionable if technical expertise for these photometric methods is still available in our subcommittee
Simultaneous determination of the elements not possible
Requires a high expenditure in terms of chemicals and labour time
Limited to only 7 elements
The standard would require some editorial and technical revision
No precision data available. If the standard is submitted to ballot this would require an ILS
Methods commonly used today:
Wet-chemical methods:
Ashingof the graphite sample according to ASTM C561
Dissolution of the ash by alkaline melt fusion or acid-pressure decomposition
Measurement of the elements in the sample solution using atomic-or mass-spectrometric methods (e.g. ICP-OES, AAS, ICP-MS)
Examples for standard test methods:
ASTM D5600 Standard Test Method for Trace Metals in Petroleum Coke by Inductively Coupled Plasma Atomic Emission Spectrometry (ICP-AES)
ASTM C781 Standard Practice for Testing Graphite Materials for Gas-Cooled Nuclear Reactor Components, section A.5 (boron by calcination and ICP-OES)
Note: Nowadays, the analysis of aqueous sample solutions by atomic-or mass-spectrometric methods can be considered as general knowledge of a laboratory. A standard in which these measurements are described in detail is therefore not really necessary. Only the sample preparation procedure is important.
Direct methods:
ETV-ICP-OES ?see ASTM D8186
GDMS
Work Item Status
Date Initiated: 06-26-2025
Technical Contact: Peter Barth
Item: 000
Ballot:
Status: