ASTM B712-93(2012)
(Guide)Standard Guide for Determination of Sodium and Potassium Content For Silver-Cadmium Oxide Contact Materials (Withdrawn 2015)
Standard Guide for Determination of Sodium and Potassium Content For Silver-Cadmium Oxide Contact Materials (Withdrawn 2015)
SIGNIFICANCE AND USE
This guide is recommended for use in analyzing the sodium and potassium content of silver-cadmium oxide materials and is meant to be used in conjunction with standard methods of atomic absorption spectroscopy. The recommended procedures cite methods for minimizing extraneous sodium and potassium contamination through use of specific handling procedures and shorter sample preparation methods. This guide also recommends procedures that prevent the formation of nonstable and potentially hazardous silver-acetylene compounds.
SCOPE
1.1 This guide describes procedures for use in conducting analysis of silver-cadmium oxide materials for sodium and potassium content. The exact methods for the performance of this testing are not stated since many different procedures are equally applicable. This guide points out specific procedures for decreasing the chance of recognized potential errors and specifies methods for increasing the sensitivity of the testing.
1.2 This standard may involve hazardous materials, operations, and equipment. 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 this standard to become familiar with all hazards including those identified in the appropriate Material Safety Data Sheet (MSDS) for this product/material as provided by the manufacturer, to establish appropriate safety and health practices, and determine the applicability of regulatory limitations prior to use. For specific precautions see Sections 4 and 6.
1.3 Whoever uses this standard should consult the Material Safety Data Sheet concerning the products involved.
WITHDRAWN RATIONALE
This guide describes procedures for use in conducting analysis of silver-cadmium oxide materials for sodium and potassium content. The exact methods for the performance of this testing are not stated since many different procedures are equally applicable. This guide points out specific procedures for decreasing the chance of recognized potential errors and specifies methods for increasing the sensitivity of the testing.
Formerly under the jurisdiction of Committee B02 on Nonferrous Metals and Alloys, this guide was withdrawn in May 2015. This standard is being withdrawn without replacement due to its limited use by industry.
General Information
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Standards Content (Sample)
NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
Designation: B712 − 93(Reapproved 2012)
Standard Guide for
Determination of Sodium and Potassium Content For Silver-
Cadmium Oxide Contact Materials
This standard is issued under the fixed designation B712; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope 2.2 Other Document:
Operation Guide for ChemicalAnalysis of Metals and Metal
1.1 This guide describes procedures for use in conducting
Bearing Ores by Atomic Absorption Spectrophotometry
analysis of silver-cadmium oxide materials for sodium and
potassium content. The exact methods for the performance of
3. Significance and Use
this testing are not stated since many different procedures are
3.1 This guide is recommended for use in analyzing the
equally applicable. This guide points out specific procedures
sodium and potassium content of silver-cadmium oxide mate-
for decreasing the chance of recognized potential errors and
rials and is meant to be used in conjunction with standard
specifies methods for increasing the sensitivity of the testing.
methods of atomic absorption spectroscopy.The recommended
procedures cite methods for minimizing extraneous sodium
1.2 This standard may involve hazardous materials,
and potassium contamination through use of specific handling
operations, and equipment. This standard does not purport to
proceduresandshortersamplepreparationmethods.Thisguide
address all of the safety concerns, if any, associated with its
also recommends procedures that prevent the formation of
use. It is the responsibility of the user this standard to become
nonstable and potentially hazardous silver-acetylene com-
familiar with all hazards including those identified in the
pounds.
appropriate Material Safety Data Sheet (MSDS) for this
product/material as provided by the manufacturer, to establish
4. Precautions
appropriate safety and health practices, and determine the
4.1 Since silver nitrate reacts with acetylene to form silver
applicability of regulatory limitations prior to use. For specific
acetylide, the guide recommends either alternative flames to
precautions see Sections 4 and 6.
air–acetylene or the removal of silver from solution. Silver
1.3 Whoever uses this standard should consult the Material
acetylide is unstable and may explode violently upon being
Safety Data Sheet concerning the products involved.
disturbed.
5. Sampling
2. Referenced Documents
5.1 Handle the sample so as to avoid contamination by
2.1 ASTM Standards:
sodium and potassium; avoid contact with hands.
E50 Practices for Apparatus, Reagents, and Safety Consid-
erations for Chemical Analysis of Metals, Ores, and
6. Procedures
Related Materials
6.1 First clean the sample in nitric acid and distilled or
E663 Practice for FlameAtomicAbsorptionAnalysis (With-
deionized water to remove extraneous surface contamination.
drawn 1997)
Test powder samples as received. Then store the samples in
such a manner as to minimize contamination.
6.2 Use a sample size of approximately2gor more for each
This guide is under the jurisdiction of ASTM Committee B02 on Nonferrous
test.
Metals and Alloys and is the direct responsibility of Subcommittee B02.05 on
Precious Metals and Electrical Contact Materials.
6.3 Handle the samples with gloves and utensils, never with
Current edition approved May 1, 2012. Published May 2012. Originally
bare hands.
approved in 1982. Last previous edition approved in 2006 as B712 – 93 (2006).
DOI: 10.1520/B0712-93R12.
6.4 The use of TFE-fluorocarbon or other suitable substi-
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
tutes for glassware is recommended. If glass is used, aged glass
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
Standar
...
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