BS ISO 13291-2006 Zinc sulfide concentrates - Determination of zinc - Solvent extraction and EDTA titrimetric method《硫化锌精矿 用溶解淬取法和EDTA滴定法测定锌含量》.pdf
《BS ISO 13291-2006 Zinc sulfide concentrates - Determination of zinc - Solvent extraction and EDTA titrimetric method《硫化锌精矿 用溶解淬取法和EDTA滴定法测定锌含量》.pdf》由会员分享,可在线阅读,更多相关《BS ISO 13291-2006 Zinc sulfide concentrates - Determination of zinc - Solvent extraction and EDTA titrimetric method《硫化锌精矿 用溶解淬取法和EDTA滴定法测定锌含量》.pdf(26页珍藏版)》请在麦多课文档分享上搜索。
1、 g49g50g3g38g50g51g60g44g49g42g3g58g44g55g43g50g56g55g3g37g54g44g3g51g40g53g48g44g54g54g44g50g49g3g40g59g38g40g51g55g3g36g54g3g51g40g53g48g44g55g55g40g39g3g37g60g3g38g50g51g60g53g44g42g43g55g3g47g36g58zinc Solvent extraction and EDTA titrimetric methodICS 73.060.99Zinc sulfide concentrates Determina
2、tion of BRITISH STANDARDBS ISO 13291:2006BS ISO 13291:2006This British Standard was published under the authority of the Standards Policy and Strategy Committee on 31 July 2006 BSI 2006ISBN 0 580 48902 7request to its secretary.Cross-referencesThe British Standards which implement international publ
3、ications referred to in this document may be found in the BSI Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Search” facility of the BSI Electronic Catalogue or of British Standards Online.This publication does not purport to include all the nec
4、essary provisions of a contract. Users are responsible for its correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations.Summary of pagesThis document comprises a front cover, an inside front cover, the ISO title page, pages ii to iv, pages 1 t
5、o 18, an inside back cover and a back cover.The BSI copyright notice displayed in this document indicates when the document was last issued.Amendments issued since publicationAmd. No. Date CommentsA list of organizations represented on this committee can be obtained on present to the responsible int
6、ernational/European committee any enquiries on the interpretation, or proposals for change, and keep UK interests informed; monitor related international and European developments and promulgate them in the UK.National forewordThis British Standard reproduces verbatim ISO 13291:2006 and implements i
7、t as the UK national standard. The UK participation in its preparation was entrusted to Technical Committee NFE/36, Copper, lead and zinc ores and concentrates, which has the responsibility to: aid enquirers to understand the text;Reference numberISO 13291:2006(E)INTERNATIONAL STANDARD ISO13291Secon
8、d edition2006-06-15Zinc sulfide concentrates Determination of zinc Solvent extraction and EDTA titrimetric method BS ISO 13291:2006ii iiiContents Page Foreword iv 1 Scope . 1 2 Normative references . 1 3 Principle. 1 4 Reagents 2 5 Apparatus 3 6 Sample . 3 6.1 Test sample . 3 6.2 Test portion . 3 7
9、Procedure 3 7.1 Number of determinations . 3 7.2 Blank test. 4 7.3 Dissolution of test portion . 4 7.4 Extraction 4 7.5 Titration 4 7.6 Determination of the titration factor of the EDTA standard solution 5 8 Expression of results . 5 9 Precision 6 9.1 Expression of precision . 6 9.2 Procedure for ob
10、taining the final result . 6 9.3 Between-laboratories precision 6 9.4 Check of trueness. 7 10 Test report . 8 Annex A (normative) Procedure for the preparation and determination of the mass of a predried test portion 9 Annex B (normative) Flowchart of the procedure for the acceptance of analytical v
11、alues for test samples 11 Annex C (normative) Elements that interfere with this method 12 Annex D (informative) Derivation of precision equations 13 Bibliography . 18 BS ISO 13291:2006iv Foreword ISO (the International Organization for Standardization) is a worldwide federation of national standards
12、 bodies (ISO member bodies). The work of preparing International Standards is normally carried out through ISO technical committees. Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. International organiza
13、tions, governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. International Standards are drafted in accordance with the rules given in t
14、he ISO/IEC Directives, Part 2. The main task of technical committees is to prepare International Standards. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of
15、 the member bodies casting a vote. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights. ISO 13291 was prepared by Technical Committee ISO/TC 183, Copper,
16、lead, zinc and nickel ores and concentrates. This second edition cancels and replaces the first edition (ISO 13291:1997), which has been technically revised. BS ISO 13291:20061Zinc sulfide concentrates Determination of zinc Solvent extraction and EDTA titrimetric method WARNING This International St
17、andard may involve hazardous materials, operations and equipment. It is the responsibility of the user of this International Standard to establish appropriate health and safety practices and determine the applicability of regulatory limitations prior to use. 1 Scope This International Standard speci
18、fies a solvent extraction/titrimetric method for the determination of the mass fraction of zinc in zinc sulfide concentrates. The method is applicable to zinc sulfide concentrates having a mass fraction of zinc in the range from 11 % to 62 %. 2 Normative references The following referenced documents
19、 are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. ISO 385, Laboratory glassware Burettes ISO 648, Laboratory glassware One-mark pipet
20、tes ISO 1042, Laboratory glassware One-mark volumetric flasks ISO 3696, Water for analytical laboratory use Specification and test methods ISO 4787, Laboratory glassware Volumetric glassware Methods for use and testing of capacity ISO 9599, Copper, lead and zinc sulfide concentrates Determination of
21、 hygroscopic moisture in the analysis sample Gravimetric method ISO Guide 35, Reference materials General and statistical principles for certification 3 Principle A test portion of zinc concentrate is dissolved in bromine and nitric acid. Any remaining insoluble residue is dissolved in sulfuric, nit
22、ric and hydrofluoric acids. A zinc thiocyanate complex is selectively extracted into methyl isobutyl ketone, after screening of some elements with thiourea and citrate ions. Partially extracted cadmium is screened with iodide ions before the final titration as explained in Annex C. Cobalt is extract
23、ed and determined separately, if present at concentration levels exceeding 0,05 %. Zinc is determined by titration with EDTA solution at pH 5,5. BS ISO 13291:20062 4 Reagents During the analysis, only reagents of recognized analytical grade and water that complies with grade 2 of ISO 3696 shall be u
24、sed. 4.1 Zinc metal, minimum purity 99,99 %, free from oxide prior to use. The surface of the metal may be cleaned by immersing the metal in hydrochloric acid (4.2), diluted 1 + 9 for 1 min, then washing well with water, followed by an acetone rinse and drying in an oven at 50 C. 4.2 Hydrochloric ac
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