ISO 12744:2006 PDF

Name: ISO 12744:2006 — Copper, lead, zinc and nickel concentrates — Experimental methods for checking the precision of sampling
SKU: ISO 12744:2006
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Copper, lead, zinc and nickel concentrates — Experimental methods for checking the precision of sampling

Название (английский):

ISO 12744:2006

Copper, lead, zinc and nickel concentrates — Experimental methods for checking the precision of sampling

Статус документа:: Отменён
Формат:: Электронный (PDF)
Количество страниц:: 15
Дата публикации:: 19 апреля 2006 г.
Издание:: ISO IS 12744 edition 2 version 1
ICS:: 73.060.99

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Описание (английский):

ISO 12744:2006 specifies methods for checking the precision of primary sampling, sample processing, chemical analysis, physical testing and determination of moisture content of copper, lead, zinc and nickel concentrates being carried out in accordance with the methods specified in ISO 12743, expressed in terms of standard deviations.

Abstract

Похожие стандарты

Упомянутые в описании и другие стандарты ISO

Overview

ISO 12744:2006 - "Copper, lead, zinc and nickel concentrates - Experimental methods for checking the precision of sampling" - defines experimental procedures to verify the precision of primary sampling, sample processing, chemical analysis, physical testing and moisture determination for copper, lead, zinc and nickel concentrates. Precision is expressed in terms of standard deviations and the standard is intended to be used in conjunction with ISO 12743 (sampling procedures).

Key topics

Scope and purpose

Provides methods to quantify precision of the full sampling-to-analysis chain for metal concentrates.
Expresses precision as standard deviations for primary sampling, sample processing and analysis.

Interleaved sampling

Pairs of interleaved samples (A and B) are formed by diverting alternate primary increments.
Recommended collection from more than 20 lots of the same concentrate type for reliable results.

Sample processing methods

Method 1: Each interleaved sample is split to produce four laboratory subsamples; all analysed in duplicate - allows separate estimation of primary sampling, processing and analytical precision.
Method 2: Produces three laboratory subsamples with duplicate analyses - provides separate but less precise variance estimates.
Method 3: Produces two laboratory subsamples analysed in duplicate - yields combined precision for sampling + processing and separate analytical precision.

Statistical evaluation

Uses duplicate means, ranges and derived variances (notation R, s1, s2, s3).
Applies the π/4 factor to relate range to variance for pairs.
Uses F-tests (95% confidence) to determine if variance components are significantly different and can be partitioned.
Computes total variance and converts to standard deviations for comparison with target precision.

Operational guidance

Analyses should be run in random order by the same analyst on the same day using the same equipment.
Frequency: repeat checks regularly and after equipment or procedure changes; embed checks in routine sampling due to workload.

Applications

Quality control and assurance in mining and mineral processing for copper, lead, zinc and nickel concentrates.

Assay and metallurgical laboratories verifying analytical and sampling performance.

Contract sampling and trading disputes where quantified sampling uncertainty is required.

Regulatory bodies and auditors assessing adherence to ISO sampling practice.

Related standards

ISO 12743 - Sampling procedures for determination of metal and moisture content (normative reference).

Users should consult additional relevant analytical ISO standards for specific chemical or physical test methods.

Keywords: ISO 12744:2006, sampling precision, copper concentrates, lead zinc nickel concentrates, interleaved samples, sample processing, sampling standard deviations, F-test.

ISO 12744:2006 PDF

Abstract

Похожие стандарты

Overview

Key topics

Applications

Who should use it

Related standards

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