1、Designation: E 2293 03 (Reapproved 2008)1Standard Practice forDrying of Metal Bearing Ores, Concentrates, and RelatedMetallurgical Materials for the Determination of Mercury1This standard is issued under the fixed designation E 2293; the number immediately following the designation indicates the yea
2、r oforiginal adoption 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.1NOTEEditorial changes were made throughout in November 2008.1. Sco
3、pe1.1 This practice covers the sample drying step for thedetermination of mercury in ores, concentrates, and relatedmetallurgical materials.1.2 The values stated in SI units are to be regarded asstandard. No other units of measurement are included in thisstandard.1.3 This standard does not purport t
4、o 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 Standards:2E50 Prac
5、tices for Apparatus, Reagents, and Safety Consid-erations for Chemical Analysis of Metals, Ores, andRelated MaterialsE 135 Terminology Relating to Analytical Chemistry forMetals, Ores, and Related MaterialsE 877 Practice for Sampling and Sample Preparation of IronOres and Related Materials for Deter
6、mination of ChemicalCompositionE 882 Guide for Accountability and Quality Control in theChemical Analysis Laboratory2.2 Other Documents:3ISO 9599 Copper, Lead, and Zinc Sulfide ConcentratesDe-termination of Hygroscopic Moisture in the AnalysisSample-Gravimetric MethodISO 12743 Copper, Lead, and Zinc
7、 Sulfide ConcentratesSampling Procedures for the Determination of Metal andMoisture ContentISO 10251 Copper, Lead, and Zinc Sulfide ConcentratesDetermination of Mass Loss of Bulk Material on Drying3. Terminology3.1 DefinitionsFor definitions of terms used in this Prac-tice, refer to Terminology E 13
8、5.4. Summary of Practice4.1 Test samples for be used for mercury determination aredried at 60 C.5. Significance and Use5.1 This practice is primarily to be used to dry samples forthe determination of mercury test portions, and it should not beused for the determination of sample moisture content. Mo
9、stsample preparation methods prescribe drying the samples at105 C, until a constant mass is obtained. The moisture contentis determined as the percentage mass loss on drying. However,since mercury can volatize from samples at the normallyutilized temperature, samples that are to be used for mercuryd
10、etermination shall be dried at 60 C (see Practice E 877,ISO 9599, ISO 12743, and ISO 10251).5.2 It is assumed that all who use this practice will betrained analysts capable of performing skillfully and safely. Itis expected that work will be performed in a properly equippedlaboratory under appropria
11、te quality control practices such asthose described in Guide E 882.6. Apparatus6.1 Drying Oven, ventilated with forced circulation of air,regulated at a temperature of 60 C 6 2 C.6.2 Top-Loading Balance, minimum precision of 0.01 %.6.3 Drying Trays, capable of holding at least a 1 kg sample,spread n
12、o thicker than 3 cm deep.1This practice is under the jurisdiction of ASTM Committee E01 on AnalyticalChemistry for Metals, Ores, and Related Materials and is the direct responsibility ofSubcommittee E01.02 on Ores, Concentrates, and Related Metallurgical Materials.Current edition approved Nov. 1, 20
13、08. Published December 2008. Originallyapproved in 2003. Last previous edition approved in 2003 as E 2293 03.2For 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 sta
14、ndards Document Summary page onthe ASTM website.3Available from International Organization for Standardization (ISO), 1, ch. dela Voie-Creuse, Case postale 56, CH-1211, Geneva 20, Switzerland, http:/www.iso.ch.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 1
15、9428-2959, United States.7. Hazards7.1 For precautions to be observed in this practice, refer toPractices E50.7.2 Mercury can form vapors at low temperatures. Mercuryvapors can be hazardous to your health. Perform method inventilated areas or wear special health protection equipment.8. Procedure8.1
16、Remove a representative laboratory sample, 500 gminimum, from the gross sample.8.2 Place the laboratory sample into a drying tray and levelto approximately 3 cm.8.3 Weigh to within 0.01 g on the top loading balance.8.4 Place the tray and test portion into the drying oven anddry at 60 C for at least
17、16 h.NOTE 1Once the drying period has commenced, no other wet samplesshould be placed into the same drying oven.8.5 Remove the tray and laboratory sample from the ovenand weigh. Dry the tray and laboratory sample for an additional4 h. Remove from the oven and weigh again. Repeat this stepas necessar
18、y until two successive determinations of the mass ofthe tray plus dried laboratory sample agree within 0.2 %percent relative. (See ISO 9599, ISO 12743, and ISO 10251.)NOTE 2Any crusts or cakes that form on the laboratory sample afterinitial drying should be broken up to enable easier release of mois
19、ture.8.6 Prepare the dried test sample for the determination ofmercury according to the appropriate technique.9. Keywords9.1 drying; mercury; moisture; sample preparationASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentionedin
20、 this standard. Users of this standard are expressly advised that determination of the validity of any such patent rights, and the riskof infringement of such rights, are entirely their own responsibility.This standard is subject to revision at any time by the responsible technical committee and mus
21、t be reviewed every five years andif not revised, either reapproved or withdrawn. Your comments are invited either for revision of this standard or for additional standardsand should be addressed to ASTM International Headquarters. Your comments will receive careful consideration at a meeting of the
22、responsible technical committee, which you may attend. If you feel that your comments have not received a fair hearing you shouldmake your views known to the ASTM Committee on Standards, at the address shown below.This standard is copyrighted by ASTM International, 100 Barr Harbor Drive, PO Box C700
23、, West Conshohocken, PA 19428-2959,United States. Individual reprints (single or multiple copies) of this standard may be obtained by contacting ASTM at the aboveaddress or at 610-832-9585 (phone), 610-832-9555 (fax), or serviceastm.org (e-mail); or through the ASTM website(www.astm.org).E 2293 03 (2008)12
