Overview
ISO 5667-4:2016 - "Water quality - Sampling - Part 4: Guidance on sampling from lakes, natural and man-made" provides practical guidance for designing sampling programmes and carrying out field sampling of lake waters. It covers open‑water and ice‑covered conditions and applies to lakes with or without aquatic vegetation. The standard focuses on representative collection, handling, preservation and transport of samples for physico‑chemical and many routine analyses. Guidance for microbiological sampling is not included.
Key topics and technical requirements
- Sampling programme design: Principles for selecting locations, horizontal and vertical distribution of sampling points (grab, depth‑profile, area‑profile, integrated and composite samples), and deciding frequency and timing to obtain representative data.
- Sampling equipment: Material selection to avoid adsorption/emission, examples of open and closed samplers, sampling poles, sampling irons, pumps and filling devices. Annexes list devices and pros/cons.
- Sampling procedures: Use of open devices for near‑surface sampling and closed samplers for depth, volatile parameters and dissolved gases; procedures for sampling through ice and severe freezing conditions.
- Sample handling & preservation: Instructions on containers, transport, stabilization and storage to maintain sample integrity for ex‑situ measurements.
- Quality assurance / quality control: QA/QC to prevent and detect contamination (blank samples, rinsing procedures, equipment cleaning and maintenance, calibration logs).
- Health & safety: Field safety considerations when sampling from boats or ice.
- Supporting guidance (Annexes): Examples of samplers, equipment advantages/disadvantages, maintaining station from boats, example report formats and continuous in‑situ measurement guidance.
Practical applications
ISO 5667-4:2016 is used to establish standardized, defensible field sampling practices for:
- Lake water quality monitoring and compliance testing
- Environmental impact assessments for reservoirs, dams and artificial lakes
- Limnological research and temporal trend studies
- Routine surveys by water utilities and catchment managers
- Baseline and post‑construction monitoring for infrastructure projects
Using the standard helps ensure data comparability, reduce sampling bias and protect sample integrity for subsequent laboratory analysis.
Who should use this standard
- Environmental laboratories and field technicians
- Water authorities and regulatory agencies
- Environmental consultants and contract monitoring teams
- Limnologists and academic researchers
- Reservoir and lake managers responsible for operational monitoring
Related standards
Keywords: ISO 5667-4:2016, water quality sampling, lake sampling guidance, sampling programme, sampling equipment, sample preservation, lake monitoring.