ASTM C 791 : 1983 : R2000
Superseded
A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.
View Superseded by
Standard Test Methods for Chemical, Mass Spectrometric, and Spectrochemical Analysis of Nuclear-Grade Boron Carbide
Hardcopy , PDF
11-11-2014
English
10-06-2000
Important note : Users cannot be edited or removed once added to your Multi user PDF.| Committee |
C 26
|
| DocumentType |
Test Method
|
| Pages |
23
|
| PublisherName |
American Society for Testing and Materials
|
| Status |
Superseded
|
| SupersededBy |
1.1 These test methods cover procedures for the chemical, mass spectrometric, and spectrochemical analysis of nuclear-grade boron carbide powder and pellets to determine compliance with specifications.
1.2 The analytical procedures appear in the following order:
| Sections | |
| Total Carbon by Combustion and Gravimetry | 7-17 |
| Total Boron by Titrimetry | 18-28 |
| Isotopic Composition by Mass Spectrometry | 29-38 |
| Chloride and Fluoride Separation by Pyrohydrolysis | 39-45 |
| Chloride by Constant-Current Coulometry | 46-54 |
| Fluoride by Ion-Selective Electrode | 55-63 |
| Water by Constant-Voltage Coulometry | 64-72 |
| Impurities by Spectrochemical Analysis | 73-81 |
| Soluble Boron by Titrimetry | 82-95 |
| Soluble Carbon by a Manometric Measurement | 96-105 |
| Metallic Impurities by a Direct Reader Spectrometric Method | 106-114 |
1.3 This method covers the determination of total carbon in nuclear-grade, boron carbide in either powder or pellet form.
1.4 This method covers the determination of total boron in samples of boron carbide powder and pellets. The recommended amount of boron for each titration is 100 10 mg.
1.5 This method covers the determination of the isotopic composition of boron in nuclear-grade boron carbide, in powder and pellet form, containing natural to highly enriched boron.
1.6 This method covers the separation of up to 100 g of halides per gram of boron carbide. The separated halides are measured using other methods found in this standard.
1.7 This method covers the measurement of chloride after separation from boron carbide by pyrohydrolysis. The lower limit of the method is about 2 g of chloride per titration.
1.8 This method covers the measurement of fluoride after separation from boron carbide by pyrohydrolysis. The lower limit of the method is about 2 g of fluoride per measurement.
1.9 This method covers the determination of water in boron carbide in either powder or pellet form. The lower limit of the method is 5 g of water.
1.10 This method covers the determination of 14 impurity elements in boron carbide in either powder or pellet form.
1.11 This method covers the determination of soluble boron in boron carbide. Soluble boron is defined as that boron dissolved under the conditions of the test.
1.12 This method covers the determination of soluble carbon in boron carbide. The lower limit of the method is 0.02 % with a 100-mg sample. Soluble carbon is defined as that carbon oxidized by the sodium dichromate-sulfuric acid solution under the conditions of this method.
1.13 This method is applicable to the determination of metallic impurities in samples of boron carbide powder and pellets. From 20 to 5000 g of many of the impurities per gram of sample can be determined.
Access your standards online with a subscription
Features
-
Simple online access to standards, technical information and regulations.
-
Critical updates of standards and customisable alerts and notifications.
-
Multi-user online standards collection: secure, flexible and cost effective.