Sampling and Sampling Containers as the Foundation for Reliable Water Analyses

Importance of the Topic

Proper sampling practices and appropriate container selection form the foundation of accurate environmental water analyses and support critical decisions in regulation, industry, and public health.

Objectives and Overview of the Study

This article reviews best practices for water sampling, evaluates container suitability, and presents stability studies conducted by ALS laboratories to ensure data reliability.

Methodology

Sampling procedures follow EN ISO 5667-3:2024, covering sample preservation, transport, identification, and storage. Container batches undergo routine stability testing to detect manufacturing variations and ensure single-use integrity.

Used Instrumentation

• Portable cooling and transport ALS bag
• Electric sampling van equipped for field operations
• Single-use plastic and glass containers with preloaded chemical preservatives
• Laboratory systems for conducting stability studies

Main Results and Discussion

Stability tests on wastewater effluent demonstrate that unpreserved ammonium degrades significantly after 48 hours, leading to false negatives, whereas chemical preservation maintains stability for over 14 days. Container material influences analyte recovery through sorption, contamination, or chemical degradation. Miniaturized containers (40–100 mL) effectively reduce waste without compromising sample representativeness.

Benefits and Practical Applications of the Method

• Chemical preservation extends analyte stability and simplifies scheduling.
• Pretested single-use containers minimize cross-contamination.
• Compliance with ISO standards ensures consistent data quality across laboratories.
• Miniaturized volumes reduce storage space and environmental impact.

Future Trends and Potential Applications

Emerging technologies may integrate digital sensors into sampling containers for real-time monitoring, while eco-friendly materials and further miniaturization will enhance sustainability. Global harmonization of sampling protocols will improve data comparability.

Conclusion

Adhering to rigorous sampling protocols and selecting validated containers with appropriate preservation is essential for reliable water analyses. Implementing these practices ensures high data integrity and supports informed decision-making in environmental management and public health.

References

• EN ISO 5667-3:2024 Water quality — Sampling — Part 3: Preservation and handling of water samples