Significance and Use
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.
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.
1. Scope
1.1 These test methods cover the chemical analysis of graphite.
1.2 The analytical procedures appear in the following order:
| Sections |
| 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) Test Method | 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 Table 1.
1.4 The values stated in SI units are to be regarded as the 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
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
Index Terms
calibration; calibration solutions; chemical analysis; color development; graphite; photometry; ICS Number Code 71.060.10; 71.060.10
DOI: 10.1520/C0560-88R05E01
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