ASTM C816-1985(2010)e1 Standard Test Method for Sulfur in Graphite by Combustion-Iodometric Titration Method《用燃烧碘量滴定法测定石墨中硫的标准试验方法》.pdf
《ASTM C816-1985(2010)e1 Standard Test Method for Sulfur in Graphite by Combustion-Iodometric Titration Method《用燃烧碘量滴定法测定石墨中硫的标准试验方法》.pdf》由会员分享,可在线阅读,更多相关《ASTM C816-1985(2010)e1 Standard Test Method for Sulfur in Graphite by Combustion-Iodometric Titration Method《用燃烧碘量滴定法测定石墨中硫的标准试验方法》.pdf(2页珍藏版)》请在麦多课文档分享上搜索。
1、Designation: C816 85 (Reapproved 2010)1An American National StandardStandard Test Method forSulfur in Graphite by Combustion-Iodometric TitrationMethod1This standard is issued under the fixed designation C816; the number immediately following the designation indicates the year oforiginal adoption or
2、, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon () indicates an editorial change since the last revision or reapproval.This standard has been approved for use by agencies of the Department of Defense.1NOTERemov
3、ed source of supply footnote and updated units of measurement throughout the standard editorially in May2010.1. Scope1.1 This test method covers the determination of sulfur ingraphite in the concentration range from 1 to 1000 g/g (ppm).1.2 The values stated in SI units are to be regarded asstandard.
4、 No other units of measurement are included in thisstandard.1.3 This standard does not purport to address all of thesafety concerns, if any, associated with its use. It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and determine the applica-b
5、ility of regulatory limitations prior to use.2. Referenced Documents2.1 ASTM Standards:2D3177 Test Methods for Total Sulfur in the AnalysisSample of Coal and CokeE50 Practices for Apparatus, Reagents, and Safety Consid-erations for Chemical Analysis of Metals, Ores, andRelated Materials3. Summary of
6、 Test Method3.1 The sample is burned in oxygen and a major portion ofthe sulfur is converted to sulfur dioxide. The sulfur dioxide ispassed through a potassium iodide-starch solution where it istitrated with potassium iodate solution. The potassium iodatesolution is standardized against samples of k
7、nown sulfurcontent.4. Significance and Use4.1 Sulfur, even in very low concentrations, is of concern ina nuclear reactor because of potential corrosion of metalliccomponents. This test method has the sensitivity to analyzevery low sulfur contents in graphite using very small samples.4.2 This test me
8、thod can be used to characterize graphite fordesign purposes.5. Interferences5.1 Any substance that releases volatile material, whichtends to enhance or to bleach the starch-iodine complex, willinterfere. Halogens and oxides of nitrogen interfere throughdarkening the color of the starch-iodine compl
9、ex. Ultravioletlight will also darken the solution. A tube packed with eithersilver wool or antimony filings placed in the line between thefurnace and titration assembly will remove halogens from thegas stream.5.2 If the solution in the titration vessel becomes colorlessduring the titration, some SO
10、2will be lost and a low result willbe obtained for the sulfur content.6. Apparatus6.1 Apparatus for the determination of sulfur by directcombustion shall be in accordance with No. 13 in Fig. 13 ofPractices E50.7. Reagents and Materials7.1 Potassium Iodate Solution (0.2 mM)Dissolve 44.4mg of potassiu
11、m iodate (KIO3) in water and dilute to 1 L.NOTE 1The sulfur equivalent for the KIO3solution is based on thefollowing reactions:KIO31 5KI 1 6HCl 5 3I21 6KCl 1 3H2OSO21 I21 2H2O 5 H2SO41 2HIOn the basis of 100 % conversion of sulfur to SO2, 1 mL of this solutionis equivalent to 20 g of sulfur.1This te
12、st method is under the jurisdiction of ASTM Committee D02 onPetroleum Products and Lubricants and is the direct responsibility of SubcommitteeD02.F0 on Manufactured Carbon and Graphite Products.Current edition approved May 1, 2010. Published May 2010. Originallyapproved in 1977. Last previous editio
13、n approved in 2005 as C816 85 (2005).DOI: 10.1520/C0816-85R10E01.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStandards volume information, refer to the standards Document Summary page onthe ASTM webs
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