EN ISO 5667-15:2026

Overview

EN ISO 5667-15:2026 (Water quality - Sampling - Part 15: Preservation and handling of samples of sludge, sediment and suspended matter) is an internationally recognized standard developed by CEN and ISO. It specifies the general requirements and procedures for the preservation, handling, and storage of samples of sewage and waterworks sludge, suspended matter, and marine and freshwater sediments. These procedures are essential for ensuring reliable chemical, physical, radiochemical, hydrobiological, and microbiological analysis in laboratories. The standard applies only to wet samples and excludes guidance for dried samples or those intended for ecotoxicological, microplastics, or specialized biological testing.

Proper sample preservation and handling are critical steps in water quality monitoring and environmental protection. Adhering to standardized procedures helps maintain sample integrity from collection to laboratory analysis, improving the reliability of test results and supporting regulatory compliance.

Key Topics

• Sample Preservation and Integrity
  Preserving the original condition of samples is crucial to prevent chemical, physical, or biological changes that can compromise analysis results. Techniques and materials are specified to avoid alterations such as volatilization, oxidation, or microbial transformation.

• Handling and Transport
  Recommendations cover container selection, labeling, and secure transport to ensure samples are not contaminated, degraded, or lost during transit. Temperature control, prevention of gas build-up, and handling of potentially hazardous materials are detailed.

• Chain of Custody and Documentation
  The standard emphasizes thorough documentation at every stage-sampling, preservation, transport, and storage-to ensure traceability and accountability, an essential part of quality assurance in laboratory analysis.

• Applicability and Limitations
  EN ISO 5667-15:2026 is not applicable to dried samples, sediment eluates, extracts, or samples specifically meant for biotesting (see ISO 5667-16) or microplastics testing (see ISO 5667-27).

Applications

EN ISO 5667-15:2026 is widely used in various fields of water and environmental monitoring, including:

• Water Treatment Facilities:
  Collecting, preserving, and analyzing sludge and sediment samples to ensure compliance with environmental regulations and operational standards.
• Environmental Monitoring:
  Assessment of pollution, sediment transport, and ecological impacts in rivers, lakes, estuaries, and marine environments.
• Research Laboratories:
  Supporting scientific studies that require consistent, comparable, and validated data on water quality, sediment composition, and contaminant loads.
• Regulatory Compliance:
  Ensuring that sampling and analytical protocols meet the requirements set by national and international water quality regulations.
• Industrial Discharges:
  Monitoring and controlling effluents from industries where sludge and suspended matter can carry pollutants.

Related Standards

The EN ISO 5667 series contains several related documents that complement Part 15:

• ISO 5667-1 - Guidance on the design of sampling programmes and techniques.
• ISO 5667-3 - Guidance on the preservation and handling of water samples.
• ISO 5667-14 - Guidance for quality assurance during sampling.
• ISO 5667-16 - Guidance for biotesting and ecotoxicological assays (not covered by Part 15).
• ISO 5667-27 - Guidance for microplastics sampling and analysis (not covered by Part 15).
• ISO/TS 5667-25 - Guidance on method validation for new preservation or storage techniques.
• ISO 6107 - Terms and definitions for water quality and sampling.

Practical Value

Implementing EN ISO 5667-15:2026 supports:

• Reliable water quality data for decision-making and environmental protection
• Harmonized methods across laboratories and jurisdictions
• Reduced risk of sample loss, contamination, or misinterpretation
• Stronger documentation and traceability to meet quality and regulatory demands

In summary, EN ISO 5667-15:2026 provides robust guidelines to uphold the integrity and reliability of sludge, sediment, and suspended matter samples throughout the water quality assessment process, underpinning both environmental safeguarding and regulatory compliance.