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Significance and Use
4.1 These test methods provide a practical way to measure the concentration of certain trace elements in graphite. Many end uses of graphite require that it be free of elements which may be incompatible with certain nuclear applications. Other elemental contamination can affect the rate of oxidative degradation.
4.2 These test methods allow measurement of trace amounts of contaminants with a minimal amount of costly equipment. The colorimetric procedures used are accessible to most laboratories.
4.3 Other instrumental analysis techniques are available, capable of simultaneous quantitative analysis of 76 stable elements in a single run, with detectability limits in the parts per million range. Standards are currently being developed for elemental analysis of impurities in graphite using glow discharge mass spectrometry (GDMS), inductively coupled plasma optical emission spectroscopy (ICP-OES), combustion ion chromatography (CIC).
1.1 These test methods cover the chemical analysis of graphite.
1.2 The analytical procedures appear in the following order:
Silicon by the Molybdenum Blue (Colorimetric) Test Method
8 to 14
Iron by the o-Phenanthroline (Colorimetric) Test Method
15 to 21
Calcium by the Permanganate (Colorimetric) Test Method
22 to 28
Aluminum by the 2-Quinizarin Sulfonic Acid Test Method
29 to 35
Titanium by the Peroxide (Colorimetric) Test Method
36 to 43
Vanadium by the 3,3′-Dimethylnaphthidine (Colorimetric)
44 to 51
Boron by the Curcumin-Oxalic Acid (Colorimetric) Test Method
52 to 59
1.3 The preferred concentration of sought element in the final solution, the limits of sensitivity, and the precision of the results are given in .
1.4 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.
1.5 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. See 56.1 for specific caution statement.
2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.
C561 Test Method for Ash in a Graphite Sample
D1193 Specification for Reagent Water
E29 Practice for Using Significant Digits in Test Data to Determine Conformance with Specifications
ICS Number Code 71.060.10 (Chemical elements)
UNSPSC Code 11101507(Graphite )
ASTM C560-15, Standard Test Methods for Chemical Analysis of Graphite, ASTM International, West Conshohocken, PA, 2015, www.astm.orgBack to Top