1、Designation: E 2293 03Standard 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 year oforiginal adoptio
2、n or, in 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 practice covers the sample drying step for thedetermination of mercur
3、y in ores, concentrates and relatedmetallurgical materials.1.2 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-bi
4、lity of regulatory limitations prior to use.2. Referenced Documents2.1 ASTM Standards:E 135 Terminology Relating to Analytical Chemistry forMetal, Ores, and Related Materials2E 877 Practice for Sampling and Sample Preparation of IronOres2E 882 Guide for Accountability and Quality Control in theChemi
5、cal Analysis Laboratory22.2 Other Documents:ISO 9599 Copper, Lead and Zinc Sulfide Concentrates-Determination of Hygroscopic Moisture in the AnalysisSample-Gravimetric MethodISO 12743 Copper, Lead, and Zinc Sulfide Concentrates-Sampling Procedures for the Determination of Metal andMoisture ContentIS
6、O 10251 Copper, Lead and Zinc Sulfide Concentrates-Determination of Mass Loss of Bulk Material on Drying3. Terminology3.1 DefinitionsFor definitions of terms used in this Prac-tice, refer to Terminology E 135.4. Summary of Practice4.1 Test samples for be used for mercury determination aredried at 60
7、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. Mostsample preparation methods prescribe drying the samples at105C, until a constant mass is obt
8、ained. 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 mercurydetermination shall be dried at 60C (See Practice E 877,Method ISO 9599, Method ISO 1273, and Me
9、thodISO 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 appropriate quality control practices such asthose described in Guide E 882.6. Apparat
10、us6.1 Drying Oven, ventilated with forced circulation of air,regulated at a temperature of 60 6 2C.6.2 Top-Loading Balance, minimum precision of 0.01 %.6.3 Drying Trays, capable of holding at least a one kgsample, spread no thicker than 3 cm deep.7. Hazards7.1 For precautions to be observed in this
11、practice, refer toPractice E 50.7.2 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 Remove a representative laboratory sample, 500 gminimum, from the gross sample
12、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 60C for at least 16 h.1This practice is under the jurisdiction of ASTM Committee E01 on Analytic
13、alChemistry for Metals, Ores and Related Materials and is the direct responsibility ofSubcommittee E01.02 on Ores, Concentrates, and Related Metallurgical Materials .Current edition approved June 10, 2003. Published July 2003.2Annual Book of ASTM Standards, Vol 03.05.1Copyright ASTM International, 1
14、00 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.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 ad
15、ditional4 h. Remove from the oven and weigh again. Repeat this stepas necessary until two successive determinations of the mass ofthe tray plus dried laboratory sample agree within 0.2 %percent relative. (See Method ISO 9599, Method ISO 12743,and Method ISO 10251.)NOTE 2Any crusts or cakes that form
16、 on the laboratory sample afterinitial drying should be broken up to enable easier release of moisture.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 posi
17、tion respecting the validity of any patent rights asserted in connection with any item mentionedin 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 responsibili
18、ty.This standard is subject to revision at any time by the responsible technical committee and must 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 AST
19、M International Headquarters. Your comments will receive careful consideration at a meeting of theresponsible 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
20、shown below.This standard is copyrighted by ASTM International, 100 Barr Harbor Drive, PO Box C700, 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).E2293032
