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D3687-19 – Standard Test Method Technical Guide
ASTM D3687-19, issued under the fixed designation D3687, is a standard test method under the jurisdiction of ASTM Committee D22 on Air Quality and the direct responsibility of Subcommittee D22.04 on Workplace Air Quality. This method specifically describes the extraction and gas chromatographic determination of organic vapors adsorbed from air onto activated charcoal sampling tubes.
📐 Scope and Methodology Overview
Section 1 of D3687-19 defines the scope of the test method. It explicitly states that the procedure involves the extraction and gas chromatographic determination of organic vapors adsorbed from air in sampling tubes packed with activated charcoal. This method is complementary to Practice D3686 for sampling atmospheres.
The standard is applicable for the analysis of samples taken from workplace or other atmospheres, provided the contaminant adsorbs onto charcoal and can be analyzed by gas chromatography (GC). For alternative sorbents and thermal desorption techniques, users are directed to Practice D6196. As specified in Section 1.5, the values stated in SI units are to be regarded as the standard.
📚 Referenced Documents and Industry Standards
Section 2 of D3687-19 consolidates the normative references essential for the application of this test method, including key ASTM standards, ISO/IEC requirements, and federal occupational safety regulations.
| 🟦 Standard / Document | 📏 Title / Role in D3687 |
|---|---|
| D1356 | Terminology Relating to Sampling and Analysis of Atmospheres |
| D3686 | Practice for Sampling Atmospheres to Collect Organic Compound Vapors (Activated Charcoal Tube Adsorption Method) |
| D6196 | Practice for Choosing Sorbents, Sampling Parameters and Thermal Desorption Analytical Conditions |
| E355 | Practice for Gas Chromatography Terms and Relationships |
| ISO/IEC 17025 | General Requirements for the Competence of Testing and Calibration Laboratories |
| NIOSH (CDC-99-74-45 & NMAM) | Documentation of NIOSH Validation Tests & Manual of Analytical Methods |
| OSHA 29 CFR 1910 | Occupational Safety and Health Standards |
⚙️ Analytical Principles and Interference Control
The core analytical process described in this standard involves the solvent desorption of collected organic vapors from the activated charcoal, followed by analysis using a gas chromatograph. Careful separate analysis of both the front and back sections of the sampling tube is critical for determining the total mass of contaminant collected and for assessing potential sample breakthrough during the sampling period.
A significant technical challenge directly acknowledged in Section 6 is that organic compounds in multicomponent samples may mutually interfere during analysis. The standard provides specific methods to resolve these interferences to ensure accurate identification and quantification. Furthermore, specific safety precautions integral to the procedure are detailed in Sections 8.5, 9.2, and Appendix X1.2.3.
| 🎯 Parameter | ⚡ Specification / Analytical Note |
|---|---|
| Adsorbent Material | Activated Charcoal (typically coconut shell or petroleum base) |
| Extraction Technique | Solvent Desorption (commonly Carbon Disulfide, CS₂) |
| Primary Instrumentation | Gas Chromatograph (GC) with FID or MS detection |
| Sampling Compatibility | Designed specifically for samples collected via Practice D3686 |
| Interference Handling | Methodologies provided in Section 6 |
🔬 Key Insight: D3687-19 is the traditional “solvent desorption” method for charcoal tubes. When using alternative sorbents or thermal desorption techniques, the standard explicitly directs users to Practice D6196 for the appropriate procedures.
⚡ Important Note: As stated in Section 1.4, “Organic compounds of multicomponent samples may mutually interfere during analysis.” Users must rigorously apply the interference resolution techniques described in Section 6 to ensure data integrity. Always follow the specific safety precautions in Sections 8.5, 9.2, and X1.2.3.
❓ Frequently Asked Questions
🔍 What is the primary purpose of ASTM D3687-19?
ASTM D3687-19 provides a standardized test method for the extraction and gas chromatographic determination of organic vapors that have been collected from air using activated charcoal tubes. It is complementary to Practice D3686, which covers the sampling procedure itself.
💡 How does this standard handle interference from complex mixtures?
Section 6 of the standard is dedicated to resolving interferences. It directly addresses the scenario where organic compounds of multicomponent samples may mutually interfere during analysis and provides specific chromatographic methods to resolve them.
⚡ What safety precautions are specifically highlighted in D3687-19?
The standard explicitly references specific precautions in Section 8.5, Section 9.2, and Appendix X1.2.3. Users must establish appropriate safety, health, and environmental practices before conducting the analysis.
📌 How does D3687 relate to Standards D3686 and D6196?
D3687 focuses strictly on the analysis of charcoal tube samples. D3686 specifically covers the sampling of atmospheres using activated charcoal tubes. Practice D6196 describes alternative sorbents and thermal desorption techniques for monitoring volatile organic chemicals, which are outside the scope of the primary charcoal tube method in D3687.