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D4547-20 – Standard Test Method Technical Guide
🧪 Scope and Target Compounds
ASTM D4547-20 establishes a comprehensive framework for the collection, handling, and preparation of solid waste, soil, and sediment samples for volatile organic compound (VOC) analysis. The standard is specifically designed for low molecular weight compounds with boiling points below 200°C that are insoluble or slightly soluble in water. This includes aromatics, hydrocarbons, halogenated hydrocarbons, ketones, acetates, nitriles, acrylates, ethers, and sulfides (Section 1.1). It strongly recommends use alongside Guide D4687 for general waste sampling planning and emphasizes that it does not replace education or experience (Section 1.5).
| 🧪 Compound Class | 📐 Key Examples & Criteria |
|---|---|
| Low MW Aromatics | BTEX (Benzene, Toluene, Ethylbenzene, Xylenes) |
| Halogenated Hydrocarbons | TCE, PCE, Vinyl Chloride |
| Ketones & Acetates | Acetone, Methyl Ethyl Ketone (MEK) |
| Nitriles, Acrylates, Sulfides | Acrylonitrile, Carbon Disulfide |
| Ethers | MTBE (Methyl tert-butyl ether) |
🛠️ Sampling Equipment and Procedural Guidance
Rather than prescribing a single method, D4547-20 acts as a roadmap linking to specific ASTM practices for various sampling conditions. It emphasizes minimizing sample disturbance and atmospheric exposure. Key techniques referenced include Split-Barrel Sampling (D1586/D1586M, D3550/D3550M), Direct Push Sampling (D6282/D6282M), and Core Barrel Handling (D6640). The standard also notes the historical use of the Disposable En Core sampler (D6418, withdrawn 2018) but focuses on general principles of sample integrity. Selection of equipment should align with the project’s Data Quality Objectives (DQOs) established via Practice D5792.
⚠️ Important Limitation: Section 1.3 clearly separates this guide from specific procedural details. It does not cover sampling design, laboratory preparation of containers, or the analysis of the samples. Users must integrate these aspects from other applicable standards and their professional judgment.
📊 Integration with Quality Standards
The standard functions as an organized collection of options based on professional judgment. It is explicitly intended to be a complement to the general planning protocol of D4687 and the specific terminology defined in D5681. The values stated in SI units (Section 1.6) are regarded as the standard, though reporting in other units is not a nonconformance. The guide also reminds users to establish appropriate safety, health, and environmental practices (Section 1.7).
💡 Professional Application: This standard “cannot replace education or experience” (Section 1.5). The word “Standard” in the title signifies approval through the ASTM consensus process, not a rigid mandatory protocol. Site-specific adaptations and professional judgment are expected and necessary for defensible data collection.
❓ Frequently Asked Questions
🔍 What specific boiling point threshold defines a VOC under this guide?
D4547-20 targets volatile organic compounds with boiling points below 200°C that are insoluble or slightly soluble in water (Section 1.1). This includes a wide range of common solvents and fuel components.
💡 Does this standard replace the need to consult other ASTM methods?
No. The standard is a Guide that references numerous specific practices (e.g., D6282 for Direct Push, D6640 for Core Barrels). It is intended to be an organized collection of options used alongside professional judgment and project-specific DQOs (Section 1.5).
⚡ What is the historical relevance of the withdrawn D6418 (En Core) standard?
The Disposable En Core sampler was a specific tool for minimizing headspace during soil VOC storage. Although D6418 was withdrawn in 2018, D4547-20 recognizes its principles as part of the broader framework of proper sample handling techniques for volatile organics. Modern practice relies heavily on the principles of D6282 and D6640.
📌 How should this guide be integrated with a waste sampling plan?
D4547-20 explicitly recommends being used in conjunction with Guide D4687 (General Planning of Waste Sampling) and Practice D5792 (Development of Data Quality Objectives) to ensure the sampling strategy is technically sound, defensible, and tailored to the specific chemicals of concern and site conditions.