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D5074-90 – Standard Test Method Technical Guide
📐 Scope and Terminology
This practice covers the preparation of natural-matrix sediment reference samples for collaborative testing of chemical methods. Natural-matrix sediment is defined as granular rock or earthy material naturally deposited in a water body, where finer material encloses larger grains. The samples are intended for major and trace inorganic analysis by partial extraction procedures, excluding trace organic pollutants.
⚙️ Preparation and Collection Procedures
The standard describes uniform procedures for developing, selecting, collecting, preparing, and using oxidized aquatic bed-sediment reference samples. Factors such as site selection, sample characteristics, and raw sample treatment are critical. The practice recognizes that natural materials are variable, so the provided factors are not exhaustive, and users must ensure applicability for their specific constituents.
📊 Referenced Standards and Quality Assurance
To support consistency, this standard references several ASTM practices, as detailed below.
| 🔍 Designation | 📘 Title |
|---|---|
| D1129 | Terminology Relating to Water |
| D3974 | Practices for Extraction of Trace Elements from Sediments |
| D3975 | Practice for Development and Use of Samples for Collaborative Testing |
| D3976 | Practice for Preparation of Sediment Samples for Chemical Analysis |
| E691 | Practice for Conducting an Interlaboratory Study |
These standards provide a framework for terminology, sample preparation, and interlaboratory precision studies, ensuring reliable reference material usage.
✅ Success: Using natural-matrix reference samples enhances the validity of collaborative test results by closely representing real sediment conditions.
⚠️ Caution: The practice is not all-inclusive; users must validate the procedure for their specific matrix and extraction method.
❓ Frequently Asked Questions
🔍 What is the primary purpose of D5074-90?
To establish uniform practices for preparing natural-matrix sediment reference samples for collaborative testing of partial extraction methods for inorganic constituents.
💡 Are these samples suitable for organic pollutant analysis?
No, they are intended for major and trace inorganic analysis only, not for trace organic compounds.
⚡ What defines a natural-matrix sediment?
It is granular rock or earthy material naturally deposited in a water body, with finer material filling interstices between larger particles.
📌 Why is user verification emphasized?
Due to the variability of natural materials, the standard’s factors may not cover all scenarios, requiring users to ensure applicability for their specific needs.