Water quality; sampling; part 2: guidance on sampling techniques (ISO 5667-2:1991)

This standard addresses critical methodologies for the collection of water samples, serving as a foundational guide for ensuring data integrity in environmental monitoring and quality assessment. It outlines specific technical procedures that practitioners must follow to maintain sample representativeness and minimize contamination risks during field operations. The guidance covers various sampling scenarios, including surface waters, groundwater, and effluents, providing structured protocols tailored to different objectives and conditions. By establishing uniform approaches for equipment selection, sampling frequency, and handling techniques, it supports consistent results across diverse geographical regions and operational contexts. The document emphasizes the importance of proper documentation and chain of custody to uphold traceability throughout the sampling process. It serves as a reference for laboratories, regulatory bodies, and industrial facilities aiming to comply with best practices in water analysis preparation. The content is designed to facilitate harmonization of sampling activities across Europe and beyond, promoting reliable data for scientific and regulatory decision-making without delving into evaluation or specific implementation mandates.