Overview
ISO 18512:2007 - Soil quality - Guidance on long and short term storage of soil samples, is an international standard developed by ISO’s Technical Committee 190 (Soil quality). This standard offers comprehensive guidance for laboratories, field researchers, and environmental professionals on how to store and preserve soil samples intended for laboratory analysis. Emphasis is placed on selecting appropriate storage and preservation conditions to maintain the integrity of soil parameters, covering both short- and long-term storage needs.
Effective soil sample storage is vital in environmental studies, agricultural research, and contamination assessments. Preservation methods protect samples from changes that may compromise analytical results, such as alterations in moisture content, chemical composition, and biological activity.
Key Topics
- Storage Duration: Guidance covers both short-term (weeks) and long-term (years or decades) sample storage, supporting routine laboratory testing, monitoring programs, and reference material archiving.
- Preservation Techniques: Recommends storage conditions such as temperature (room temperature, refrigeration, freezing), humidity control, and protection from light.
- Sample Containers: Outlines criteria for selecting containers (glass vs. plastic), importance of airtight seals, and sample quantity considerations.
- Sample Preparation: Offers advice on preparing samples for analysis after storage, including prevention of cross-contamination and remixing protocols.
- Documentation & Quality Control: Stresses robust labelling, tracking, and documentation systems to ensure traceability, particularly in large-scale studies.
- Stepwise Approach: Presents a logical, step-by-step procedure for designing soil sample storage strategies based on intended analyses, future use scenarios, and budget.
- Parameter Sensitivity: Discusses how storage conditions affect physical, chemical, and biological parameters such as pH, electrical conductivity, nutrient compounds, metals, and organic substances.
Applications
ISO 18512:2007 is invaluable for professionals who:
- Conduct Environmental Site Assessments: Enables reliable storage of samples for contaminant analysis or future re-evaluation.