ASTM B712-1993(2006) Standard Guide for Determination of Sodium and Potassium Content For Silver-Cadmium Oxide Contact Materials《氧化银镉接触材料用钠和钾含量的测定标准指南》.pdf
《ASTM B712-1993(2006) Standard Guide for Determination of Sodium and Potassium Content For Silver-Cadmium Oxide Contact Materials《氧化银镉接触材料用钠和钾含量的测定标准指南》.pdf》由会员分享,可在线阅读,更多相关《ASTM B712-1993(2006) Standard Guide for Determination of Sodium and Potassium Content For Silver-Cadmium Oxide Contact Materials《氧化银镉接触材料用钠和钾含量的测定标准指南》.pdf(2页珍藏版)》请在麦多课文档分享上搜索。
1、Designation: B 712 93 (Reapproved 2006)Standard Guide forDetermination of Sodium and Potassium Content For Silver-Cadmium Oxide Contact Materials1This standard is issued under the fixed designation B 712; the number immediately following the designation indicates the year oforiginal adoption or, in
2、the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon (e) indicates an editorial change since the last revision or reapproval.1. Scope1.1 This guide describes procedures for use in conductinganalysis of silver-cadmium oxi
3、de materials for sodium andpotassium content. The exact methods for the performance ofthis testing are not stated since many different procedures areequally applicable. This guide points out specific proceduresfor decreasing the chance of recognized potential errors andspecifies methods for increasi
4、ng the sensitivity of the testing.1.2 This standard may involve hazardous materials, opera-tions, and equipment. This standard does not purport toaddress all of the safety concerns, if any, associated with itsuse. It is the responsibility of the user this standard to becomefamiliar with all hazards
5、including those identified in theappropriate Material Safety Data Sheet (MSDS) for thisproduct/material as provided by the manufacturer, to establishappropriate safety and health practices, and determine theapplicability of regulatory limitations prior to use. For specificprecautions see Sections 4
6、and 6.1.3 Whoever uses this standard should consult the MaterialSafety Data Sheet concerning the products involved.2. Referenced Documents2.1 ASTM Standards:2E 50 Practices for Apparatus, Reagents, and Safety Consid-erations for Chemical Analysis of Metals, Ores, andRelated MaterialsE 663 Practice f
7、or Flame Atomic Absorption Analysis32.2 Other Document:Operation Guide for Chemical Analysis of Metals andMetal Bearing Ores by Atomic Absorption Spectropho-tometry43. Significance and Use3.1 This guide is recommended for use in analyzing thesodium and potassium content of silver-cadmium oxide mate-
8、rials and is meant to be used in conjunction with standardmethods of atomic absorption spectroscopy. The recommendedprocedures cite methods for minimizing extraneous sodiumand potassium contamination through use of specific handlingprocedures and shorter sample preparation methods. This guidealso re
9、commends procedures that prevent the formation ofnonstable and potentially hazardous silver-acetylene com-pounds.4. Precautions4.1 Since silver nitrate reacts with acetylene to form silveracetylide, the guide recommends either alternative flames toairacetylene or the removal of silver from solution.
10、 Silveracetylide is unstable and may explode violently upon beingdisturbed.5. Sampling5.1 Handle the sample so as to avoid contamination bysodium and potassium; avoid contact with hands.6. Procedures6.1 First clean the sample in nitric acid and distilled ordeionized water to remove extraneous surfac
11、e contamination.Test powder samples as received. Then store the samples insuch a manner as to minimize contamination.6.2 Use a sample size of approximately2gormore for eachtest.6.3 Handle the samples with gloves and utensils, never withbare hands.6.4 The use of TFE-fluorocarbon or other suitable sub
12、sti-tutes for glassware is recommended. If glass is used, aged glass1This guide is under the jurisdiction of ASTM Committee B02 on NonferrousMetals and Alloys and is the direct responsibility of Subcommittee B02.05 onPrecious Metals and Electrical Contact Materials.Current edition approved June 1, 2
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