1、Designation: D4208 02 (Reapproved 2007)D4208 13Standard Test Method forTotal Chlorine in Coal by the Oxygen Bomb Combustion/IonSelective Electrode Method1This standard is issued under the fixed designation D4208; the number immediately following the designation indicates the year oforiginal adoption
2、 or, 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.1. Scope Scope*1.1 This test method covers the analysis of total chlorine in coal.1.2 Un
3、itsThe values stated in SI units are to be regarded as standard. No other units of measurement are included in thisstandard.1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibilityof the user of this standard to establish app
4、ropriate safety and health practices and determine the applicability of regulatorylimitations prior to use.2. Referenced Documents2.1 ASTM Standards:2D121 Terminology of Coal and CokeD1193 Specification for Reagent WaterD3173 Test Method for Moisture in the Analysis Sample of Coal and CokeD3180 Prac
5、tice for Calculating Coal and Coke Analyses from As-Determined to Different BasesE144 Practice for Safe Use of Oxygen Combustion BombsE691 Practice for Conducting an Interlaboratory Study to Determine the Precision of a Test Method3. Terminology3.1 For definitions of terms used in this test method,
6、refer to Terminology D121.4. Summary of Test Method4.1 Total chlorine is determined in this method by combusting a weighed sample in an oxygen bomb with dilute base adsorbingthe chlorine vapors. The bomb is rinsed into a beaker with water and following the addition of an ionic strength adjuster, the
7、chloride is determined by ion-selective electrode.5. Significance and Use5.1 The purpose of this test method is to measure the total chlorine content of coal. The chlorine content of coals may be usefulin the evaluation of slagging problems, corrosion in engineering processes, and in the total analy
8、sis of coal and coke. When coalsamples are combusted in accordance with this method, the chlorine is quantitatively retained and is representative of the totalchlorine content of the whole coal.6. Apparatus6.1 Combustion Bomb, constructed of materials that are not affected by the combustion process
9、or products. The bomb mustbe designed so that all liquid combustion products can be quantitatively recovered by washing the inner surfaces. There must beno gas leakage during the test. The bomb must be capable of withstanding a hydrostatic-pressure test to 3000 psig (approximately20 MPa)approximatel
10、y 20 MPa at room temperature without stressing any part beyond its elastic limit.1 This test method is under the jurisdiction of ASTM Committee D05 on Coal and Coke and is the direct responsibility of Subcommittee D05.21 on Methods of Analysis.Current edition approved May 1, 2007Jan. 1, 2013. Publis
11、hed May 2007January 2013. Originally approved in 1982. Last previous edition approved in 20022007 asD4208 88 (2002)D4208 021 .(2007). DOI: 10.1520/D4208-02R07.10.1520/D4208-13.2 For referencedASTM standards, visit theASTM website, www.astm.org, or contactASTM Customer Service at serviceastm.org. For
12、 Annual Book of ASTM Standardsvolume information, refer to the standards Document Summary page on the ASTM website.This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Becauseit may no
13、t be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current versionof the standard as published by ASTM is to be considered the official document.*A Summary of Changes section appears at the en
14、d of this standardCopyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States16.2 Water BathA container large enough to hold the combustion bomb and enough cooling water to dissipate the heatgenerated during the combustion process. The container
15、shall be designed to allow a constant flow of water around the combustionbomb.6.3 Combustion CruciblesSamples shall be burned in an open crucible of platinum, quartz, or acceptable base-metal alloy.6.4 Firing Wire, 100-mm, nickel-chromium alloy, No. 34B or through the ASTM website(www.astm.org). Per
16、mission rights to photocopy the standard may also be secured from the ASTM website (www.astm.org/COPYRIGHT/).TABLE A1.1 Repeatability (Sr, r) and Reproducibility (SR, R)Parameters Used for Calculation of the Precision StatementSample Average Sr SR r R1 226.7 42.5 88.2 119.0 247.02 291.3 24.3 90.4 68.0 253.16 488.4 44.1 88.6 123.5 248.15 709.6 42.7 99.4 119.6 278.37 1021.5 37.2 180.5 104.2 505.43 1588.0 106.8 268.0 299.0 750.44 2154.0 111.8 182.1 313.0 509.9D4208 135
