BRITISH STANDARD BS ISO 12744:2006 Copper, lead, zinc and nickel concentrates - Experimental methods for checking the precision of sampling ICS 73.060.99 BSi British Standards BSISO12744:2006 National foreword This British Standard reproduces verbatim ISO 12744:2006 and implements it 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; present to the responsible international/European committee any interests informed; monitorrelated international and European developments and promulgate them in the UK. A list of organizations represented on this committee can be obtained on request to its secretary. Cross-references The British Standards which implement international publications 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 necessary 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 pages Thisdocument comprises a front cover,an insidefrontcover, theIsO title page, pages ii to iv, pages 1 to 15 and a back cover. The BSl copyright notice displayed in this document indicates when the documentwaslastissued. This British Standard was Amendments issued since publication published under the authority of the Standards Policy and Amd. No. Date Comments Strategy Committee on 31May 2006 @BSI2006 Licens ISBN 0 580 48420 3 BSISO12744:2006 INTERNATIONAL ISO STANDARD 12744 Second edition 2006-04-15 Copper, lead, zinc and nickel concentrates Experimental methods for checking the precision of sampling Concentres de cuivre, de plomb, de zinc et de nickel Methodes experimentales decontrole dela fidelite deI'échantillonnage Referencenumber ISO12744:2006(E) ISO ii BSISO12744:2006 StandardsInstitution2013 Contents Page Foreword.. 1 Scope 2 Normative references British 3 Generalconditions 3.1 General... 3.2 Number of lots.... 3.3 Numberof increments and numberof samples 3.4 Sampleprocessing and analysis.... 3.5 Frequency ofprecision checks. () 4 Symbols 5 Method of experiment. 5.1 Interleaved samples... 5.2 Sample processing and analysis .... 5.2.1 Sampleprocessing method 1 (see Figure 2) 5.2.2 Sampleprocessing method 2 (see Figure 3) 5.2.3 Sampleprocessingmethod3(seeFigure4) 6 Evaluationof experimental data.. 6.1 General... 6 6.2 Sampleprocessingmethod 1 6.3 Sampleprocessing method 2. 6.4 Sample processing method 3.. 7 Assessmentofresultsandaction 11 7.1 Primary sampling.. 11 7.2 Sampleprocessing. 11 7.3 Analysis.... 11 8 Recording of data 11 12 AnnexA(informative)Recording of samplingdata... Bibliography ili