ISO 12744:2006

Name: ISO 12744:2006 — Copper, lead, zinc and nickel concentrates — Experimental methods for checking the precision of sampling
SKU: ISO 12744:2006
Price: 25 EUR
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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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Цена:25 €

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

Overview

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.

Who should use it

Metallurgical engineers, laboratory managers, mine QA/QC personnel, assay labs, consultants and procurement/contract teams involved in concentrate sampling and valuation.

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.

Технические детали

Технический комитет: ISO/TC 183 - Copper, lead, zinc and nickel ores and concentrates
SKU: ISO 12744:2006

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ISO 12744:2006

Abstract

Overview

Похожие стандарты

Key topics

Applications

Who should use it

Related standards

Технические детали

BS ISO 12743:2021

Copper, lead, zinc and nickel concentrates. sampling procedures for determination of metal and moisture conte…

ISO 8212:1986

Soaps and detergents — Techniques of sampling during manufacture

ISO 20662:2020

Ships and marine technology — Hopper dredger supervisory and control systems

ISO 3021:2023

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ISO 3826-2:2008

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ISO/IEC 24730-1:2014

Information technology — Real-time locating systems (RTLS) — Part 1: Application programming interface (API)

ISO 8668-5:1992

Aircraft — Terminal junction systems — Part 5: Detail specification for type 3 system

ISO 7574-3:1985

Acoustics — Statistical methods for determining and verifying stated noise emission values of machinery and e…