ISO 10226-1991 PDF

Full title and description

ISO 10226:1991 — "Aluminium ores — Experimental methods for checking the bias of sampling". This International Standard specifies experimental procedures to check sampling bias for aluminium ores when sampling is carried out in accordance with ISO 8685 (sampling procedures) and related sample‑preparation rules (for example ISO 6140). It describes the experimental design, data analysis and includes numerical examples (tables) to illustrate application.

Abstract

Specifies experimental checking methods for assessing bias in sampling of aluminium ores. The standard sets out a reference method (stopped‑belt sampling, referred to as Method A) and procedures for comparing a method to be checked (Method B) using paired measurements, statistical analysis (one‑sided t‑test at the 5% significance level where applicable) and guidance on sampling and sample preparation; numerical examples (tables 3–5) support the procedures.

General information

• Status: Withdrawn.
• Publication date: 11 September 1991 (1st edition).
• Publisher: International Organization for Standardization (ISO).
• ICS / categories: 73.060.40 — Aluminium ores.
• Edition / version: Edition 1 (1991).
• Number of pages: 5 pages.

Scope

ISO 10226:1991 applies to experimental checking of bias in sampling procedures for aluminium ores where sampling follows ISO 8685. It covers: selection of paired sampling runs, preparation of paired analytical samples (in line with ISO 6140 where applicable), calculation of differences between paired results, determination of standard deviation and application of statistical tests to determine whether observed differences indicate a systematic bias. The standard is intended for use when adopting an alternative routine sampling method or checking sample‑preparation procedures.

Key topics and requirements

• Definition of the reference method (stopped‑belt sampling, Method A) and the method to be checked (Method B).
• Design of experiments using paired sets of measurements obtained from the same material.
• Statistical analysis procedures (calculation of paired differences, mean difference, standard deviation and one‑sided t‑test at 5% significance to assess bias).
• Guidance on sampling and sample preparation consistent with ISO 6140.
• Provision of numerical examples and tables (tables 3–5) to illustrate calculations and decision criteria.

Typical use and users

Used by mining and mineral processing companies, laboratory quality‑assurance personnel, sampling engineers, inspection bodies and national standards committees involved in the sampling and analysis of aluminium ores. Typical applications include validating alternative sampling procedures, periodic checks of sampling systems and verifying sample‑preparation methods to ensure representative assay results.

Related standards

Commonly referenced standards and documents: ISO 8685 (Aluminium ores — Sampling procedures), ISO 6140 (sample preparation for aluminium ores), and related ISO publications on sampling precision and experimental check methods such as ISO 10277 (experimental methods for checking the precision of sampling of aluminium ores) and other ore sampling standards in the 102xx/3086 family.

Keywords

Aluminium ores; sampling bias; sampling procedures; stopped‑belt sampling; sample preparation; paired measurements; statistical test; one‑sided t‑test; quality control; ISO 8685; ISO 6140.

FAQ

Q: What is this standard?

A: ISO 10226:1991 is an ISO International Standard titled "Aluminium ores — Experimental methods for checking the bias of sampling" that provides experimental procedures and statistical methods to check whether a sampling method or sample‑preparation procedure is biased.

Q: What does it cover?

A: It covers experimental design for paired sampling tests, instructions for preparing paired samples, calculation of differences and standard deviation, and the use of statistical tests (notably the one‑sided t‑test at the 5% level where applicable) to determine whether a systematic sampling bias exists. Numerical examples (tables 3–5) illustrate the calculations.

Q: Who typically uses it?

A: Mining companies, laboratory analysts, sampling engineers, QA/QC staff, testing laboratories and standards bodies concerned with representative sampling and assay reproducibility for aluminium ores.

Q: Is it current or superseded?

A: ISO 10226:1991 is Withdrawn. The ISO catalogue shows the standard as withdrawn (stage 95.99) following reviews; withdrawal actions were proposed in 2016 and national catalogues record the withdrawal. Users should consult the ISO catalogue or their national standards body for the current guidance or any replacement standards.

Q: Is it part of a series?

A: Yes — it is part of a family of ISO documents addressing sampling and experimental checking for ores (see ISO 8685 for sampling procedures, ISO 6140 for sample preparation, and related experimental methods such as ISO 10277 for precision checks). These documents together form the normative guidance for sampling and checking sampling performance in the aluminium‑ores sector.

Q: What are the key keywords?

A: Aluminium ores, sampling bias, sampling procedures, stopped‑belt sampling, paired measurements, statistical analysis, sample preparation, quality control, ISO 8685, ISO 6140.