ISO 5667-2-1991 PDF

Full title and description

St ISO 5667-2:1991 — Water quality — Sampling — Part 2: Guidance on sampling techniques. This international standard gives general guidance on techniques and approaches for collecting water samples from a variety of environments; it is not a procedures manual for every specific sampling situation and does not replace specific local or method-driven instructions. Annex A is an integral part of the publication.

Abstract

Part 2 of the ISO 5667 family provides guidance on common sampling techniques used in water quality monitoring: spot (grab) sampling, periodic/discontinuous sampling, depth and area profile sampling, series and composite sampling, and practical considerations for sampling equipment and sample integrity. It emphasizes selection of appropriate sampling methods for the parameters of interest and the need to combine sampling technique with proper preservation and handling (covered in other parts of the 5667 series).

General information

• Status: Withdrawn (ISO lifecycle entry; withdrawal effective 14 December 2006)
• Publication date: July 18, 1991 (Edition 2, 1991)
• Publisher: International Organization for Standardization (ISO)
• ICS / categories: 13.060.45 (Water quality)
• Edition / version: Edition 2 (1991)
• Number of pages: 9

Scope

The standard gives general guidance on selection and application of sampling techniques for water-quality monitoring. It addresses types of samples (spot/grab, periodic/discontinuous, series/profile and composite), recommended practices for obtaining representative samples from different depths and areas, and practical considerations for sample collection equipment and flow management. It does not prescribe detailed procedural steps for every specialized sampling situation nor detailed preservation and handling procedures (these topics are addressed in other parts of the ISO 5667 series).

Key topics and requirements

• Definitions and classification of sample types: spot (grab), periodic/discontinuous, series (depth and area profiles), area/point sampling and composite samples.
• Guidance on timing and frequency: use of timing mechanisms for periodic sampling and selection of sampling intervals to capture temporal variability.
• Depth and area profiling: procedures for collecting samples at multiple depths or across an area to characterise vertical and horizontal variability.
• Series and composite sampling: recommendations for parallel filters/cartridges and sequencing to avoid overload and to obtain representative integrated samples.
• Equipment and flow considerations: selection and management of sampling devices, prevention of contamination, and approaches to maintain required flow rates.
• Unstable parameters and in‑situ measurement: recommendation to measure unstable or easily altered parameters in situ where practical (e.g., dissolved gases, residual chlorine).
• Linkage to sample preservation/handling standards: brief coverage of preservation needs and cross-reference to ISO 5667‑3 (preservation and handling) for detailed procedures.
• Documentation and traceability: record sampling location, date/time, depth, environmental conditions and any deviations from planned procedure to ensure data quality and traceability.

Typical use and users

Used as a guidance reference by environmental monitoring laboratories, water utilities, environmental consultants, regulatory agencies, researchers and field sampling teams involved in routine or investigatory water-quality monitoring. It supports programme design and field practice choices rather than providing laboratory analytical methods.

Related standards

Part of the ISO 5667 series on water quality sampling. Closely related parts include ISO 5667‑1 (design of sampling programmes), ISO 5667‑3 (preservation and handling of samples), ISO 5667‑4 (sampling from lakes and reservoirs), ISO 5667‑5 (drinking water), ISO 5667‑6 (rivers and streams) and other part‑specific guidance documents. The Part 2:1991 edition has been withdrawn and its guidance has been incorporated or superseded by later revisions and other parts of the ISO 5667 series.

Keywords

water quality; sampling; sampling techniques; grab sample; spot sample; periodic sampling; depth profile; series sampling; composite sampling; in‑situ measurement; sample handling; ISO 5667

FAQ

Q: What is this standard?

A: ISO 5667‑2:1991 is the second edition (1991) of Part 2 in the ISO 5667 series, titled "Water quality — Sampling — Part 2: Guidance on sampling techniques", providing general guidance on how to collect representative water samples in a range of situations.

Q: What does it cover?

A: It covers sampling types and techniques (spot/grab, periodic, depth/area profiles, series and composite sampling), equipment and flow considerations, recommendations for in‑situ measurement of unstable parameters, and guidance on obtaining representative samples. Detailed preservation and handling procedures are covered in ISO 5667‑3 and other parts of the series.

Q: Who typically uses it?

A: Environmental laboratories, field samplers, water utilities, consultants, researchers and regulatory bodies use the guidance to design field sampling approaches and to select appropriate sampling techniques for monitoring programmes.

Q: Is it current or superseded?

A: ISO 5667‑2:1991 is withdrawn (withdrawal effective 14 December 2006). Its guidance has been incorporated into later revisions and other parts of the ISO 5667 series; users should consult the latest editions of relevant ISO 5667 parts for current requirements and guidance.

Q: Is it part of a series?

A: Yes — it is one part of the ISO 5667 series (Water quality — Sampling). The series includes Part 1 (sampling programme design), Part 3 (preservation/handling) and multiple part‑specific documents addressing lakes, rivers, drinking water, marine waters, wet deposition, and more.

Q: What are the key keywords?

A: Key keywords are water quality, sampling, sampling techniques, grab/spot sample, depth profile, series sampling, composite sampling, in‑situ measurement, sample preservation, ISO 5667.