1、Designation: D4208 13D4208 18Standard Test Method forTotal Chlorine in Coal by the Oxygen BombVesselCombustion/Ion Selective Electrode Method1This standard is issued under the fixed designation D4208; the number immediately following the designation indicates the year oforiginal adoption or, in the
2、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*1.1 This test method covers the analysis of total chlorine in coal.1.2 UnitsThe values stat
3、ed 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 appropriate safety sa
4、fety, health, and healthenvironmental practices and determine theapplicability of regulatory limitations prior to use.1.4 This international standard was developed in accordance with internationally recognized principles on standardizationestablished in the Decision on Principles for the Development
5、 of International Standards, Guides and Recommendations issuedby the World Trade Organization Technical Barriers to Trade (TBT) Committee.2. Referenced Documents2.1 ASTM Standards:2D121 Terminology of Coal and CokeD1193 Specification for Reagent WaterD3173 Test Method for Moisture in the Analysis Sa
6、mple of Coal and CokeD3180 Practice for Calculating Coal and Coke Analyses from As-Determined to Different BasesE144 Practice for Safe Use of Oxygen Combustion VesselsE691 Practice for Conducting an Interlaboratory Study to Determine the Precision of a Test Method3. Terminology3.1 For definitions of
7、 terms used in this test method, 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 combustion vessel withdilute base adsorbing the chlorine vapors. The bombvessel is rinsed into a beaker with water and
8、following the addition of an ionicstrength adjuster, the 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, c
9、orrosion in engineering processes, and in the total analysis 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,Vessel, construct
10、ed of materials that are not affected by the combustion process or products. Thebombvessel must be designed so that all liquid combustion products can be quantitatively recovered by washing the inner surfaces.1 This test method is under the jurisdiction of ASTM Committee D05 on Coal and Coke and is
11、the direct responsibility of Subcommittee D05.21 on Methods of Analysis.Current edition approved Jan. 1, 2013Dec. 15, 2018. Published January 2013February 2019. Originally approved in 1982. Last previous edition approved in 20072013as D4208 02D4208 13.(2007). DOI: 10.1520/D4208-13.10.1520/D4208-18.2
12、 For referencedASTM standards, visit theASTM website, www.astm.org, or contactASTM Customer Service at serviceastm.org. For 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
13、provide the user of an ASTM standard an indication of what changes have been made to the previous version. Becauseit may not 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
14、the standard as published by ASTM is to be considered the official document.*A Summary of Changes section appears at the end of this standardCopyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States1There must be no gas leakage during the test.
15、 The bombvessel must be capable of withstanding a hydrostatic-pressure test toapproximately 20 MPa 20 MPa at room temperature without stressing any part beyond its elastic limit.6.2 Water BathA container large enough to hold the combustion bombvessel and enough cooling water to dissipate the heatgen
16、erated during the combustion process. The container shall be designed to allow a constant flow of water around the combustionbomb.vessel.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,100 mm, nickel-chro
17、mium alloy, No. 34B or through the ASTM website(www.astm.org). Permission rights to photocopy the standard may also be secured from the Copyright Clearance Center, 222Rosewood Drive, Danvers, MA 01923, Tel: (978) 646-2600; http:/ 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 185
