ISO 8466-1-2021 PDF

Full title and description

St ISO 8466-1-2021 — Water quality — Calibration and evaluation of analytical methods — Part 1: Linear calibration function. This International Standard specifies calibration strategies and the calculation of analytical results for physicochemical and chemical methods used in water quality analysis; it establishes the general context for linear calibration so that individual water‑analysis method standards can refer to a common approach.

Abstract

ISO 8466-1:2021 describes procedures for determining an appropriate linear working range, for establishing linear calibration functions (including simple linear regression and practical formulae), and for choosing calibration strategies (one‑point, two‑point, multi‑point, external/internal standard, calibration of the total procedure and standard addition). The document also gives guidance on testing calibration validity (control samples, slope testing) and includes informative and normative annexes on statistical tests (Mandel goodness‑of‑fit), empirical curvature tests and weighted regression (1/x).

General information

• Status: Published
• Publication date: 17 November 2021
• Publisher: International Organization for Standardization (ISO)
• ICS / categories: 13.060.01 (Water quality in general)
• Edition / version: Edition 2 (2021)
• Number of pages: 41

Core bibliographic details above are taken from the ISO bibliographic entry and confirmed by standards catalogues.

Scope

ISO 8466-1:2021 applies to analytical methods for water quality that require calibration and focuses specifically on linear calibration functions. It provides guidance on selecting and verifying a linear working range, establishing the calibration function appropriate to the selected calibration strategy, calculating analytical results from that function, and testing the ongoing validity of the calibration for routine series of measurements. The standard is intended to be referenced by individual analytical method standards for water analysis.

Key topics and requirements

• Determination and estimation of the linear working range (visual x/y plots, point‑to‑point slope analysis, empirical curvature test in Annex C).
• Calibration strategies: one‑point, two‑point, multi‑point, external standard, internal standard, calibration of the total procedure, and standard addition (procedures for establishing the calibration and calculating results for each strategy).
• Calculation of the linear calibration function using simple linear regression (formulae for slope and intercept) and practical guidance for applying the function to sample results.
• Testing calibration validity during a measurement series (use of control samples/solutions and tests of the calibration slope).
• Statistical guidance and tools: Mandel goodness‑of‑fit, examples of linearity testing (Annex B), empirical curvature test (Annex C) and weighted regression (Annex D, e.g., weighting 1/x).
• Requirements and recommendations related to limits of detection/quantification and how these relate to the lowest calibration level (see referenced guidance such as ISO/TS 13530 for LOD/LOQ approaches).

These technical points and requirements are summarized from the standard's clauses and annexes.

Typical use and users

Primary users are environmental and water testing laboratories, method developers, accreditation and conformity assessment bodies, instrument and software manufacturers (for calibration and reporting features), and quality assurance/quality control personnel responsible for ensuring traceable, comparable analytical results in water quality testing. The standard supports routine analytical work as well as method development where a reliable linear calibration approach is required.

Related standards

ISO 8466 is a multi‑part series; related documents include ISO 8466-2 (Calibration strategy for non‑linear second‑order calibration functions, edition 2001) and other ISO guidance on measurement uncertainty and QC such as ISO 11352 and ISO/TS 13530 (analytical QC and LOD/LOQ guidance). Individual water‑analysis method standards may reference ISO 8466‑1 for linear calibration procedures.

Keywords

linear calibration, calibration function, water quality, analytical methods, linearity testing, weighted regression, standard addition, internal standard, external standard, limit of detection, limit of quantification, measurement uncertainty, calibration validity, Mandel test.

FAQ

Q: What is this standard?

A: ISO 8466-1:2021 is an International Standard that defines principles, procedures and statistical guidance for establishing and evaluating linear calibration functions used in physicochemical and chemical analytical methods for water quality.

Q: What does it cover?

A: It covers selection and estimation of a linear working range, different calibration strategies (one‑point to multi‑point, external/internal standards, total‑procedure calibration, standard addition), calculation of linear calibration functions (regression formulae), tests for calibration validity, and informative/normative annexes with statistical tests (e.g., Mandel test, empirical curvature, weighted regression).

Q: Who typically uses it?

A: Environmental and water testing laboratories, method developers, QA/QC specialists, instrument and software vendors, and accreditation bodies use this standard to ensure consistent calibration practice and comparable analytical results.

Q: Is it current or superseded?

A: ISO 8466-1:2021 is the current edition (published November 2021). It supersedes and replaces the earlier ISO 8466-1:1990 edition, which has been withdrawn.

Q: Is it part of a series?

A: Yes — ISO 8466 is a series addressing calibration and evaluation of analytical methods for water quality. Part 1 addresses linear calibration functions; Part 2 addresses non‑linear second‑order calibration functions. Other related ISO documents cover measurement uncertainty and quality control methods referenced from ISO 8466‑1.

Q: What are the key keywords?

A: Linear calibration, calibration strategy, working range, regression, weighted regression, standard addition, internal/external standard, linearity testing, detection limit, quantification limit, measurement uncertainty.