1、Designation: D 4208 02 (Reapproved 2007)Standard Test Method forTotal Chlorine in Coal by the Oxygen Bomb Combustion/IonSelective Electrode Method1This standard is issued under the fixed designation D 4208; the number immediately following the designation indicates the year oforiginal adoption or, i
2、n 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 test method covers the analysis of total chlorine incoal.1.2 This standard d
3、oes 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-bility of regulatory limitations prior to use.2. Referenced Documents2.1 ASTM St
4、andards:2D 1193 Specification for Reagent WaterD 3173 Test Method for Moisture in theAnalysis Sample ofCoal and CokeD 3180 Practice for Calculating Coal and Coke Analysesfrom As-Determined to Different BasesE 144 Practice for Safe Use of Oxygen Combustion BombsE 691 Practice for Conducting an Interl
5、aboratory Study toDetermine the Precision of a Test Method3. Summary of Test Method3.1 Total chlorine is determined in this method by combus-ting a weighed sample in an oxygen bomb with dilute baseadsorbing the chlorine vapors.The bomb is rinsed into a beakerwith water and following the addition of
6、an ionic strengthadjuster, the chloride is determined by ion-selective electrode.4. Significance and Use4.1 The purpose of this test method is to measure the totalchlorine content of coal. The chlorine content of coals may beuseful in the evaluation of slagging problems, corrosion inengineering proc
7、esses, and in the total analysis of coal andcoke. When coal samples are combusted in accordance withthis method, the chlorine is quantitatively retained and isrepresentative of the total chlorine content of the whole coal.5. Apparatus5.1 Combustion Bomb, constructed of materials that are notaffected
8、 by the combustion process or products. The bombmust be designed so that all liquid combustion products can bequantitatively recovered by washing the inner surfaces. Theremust be no gas leakage during the test. The bomb must becapable of withstanding a hydrostatic-pressure test to 3000 psig(approxim
9、ately 20 MPa) at room temperature without stressingany part beyond its elastic limit.5.2 Water BathA container large enough to hold thecombustion bomb and enough cooling water to dissipate theheat generated during the combustion process. The containershall be designed to allow a constant flow of wat
10、er around thecombustion bomb.5.3 Combustion CruciblesSamples shall be burned in anopen crucible of platinum, quartz, or acceptable base-metalalloy.5.4 Firing Wire, 100-mm, nickel-chromium alloy, No. 34Bor through the ASTM website(www.astm.org).5An interlaboratory study, designed consistent with Prac
11、tice E 691, was con-ducted in 1989. Ten laboratories participated in this study. Supporting data havebeen filed at ASTM International Headquarters and may be obtained by requestingResearch Report RR: D05-1005.TABLE 1 Concentrations Range and Limits for Repeatability andReproducibility for Chlorine in CoalConcentrationRange,g/gRepeatabilityLimit,rReproducibilityLimit,R220 to 2100 48.4 + 0.13 X 200+0.23XD 4208 02 (2007)3
