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D5438-23 – Standard Test Method Technical Guide
📏 Scope and Applicability
ASTM D5438-23 specifies a practice for collecting settled floor dust from carpets and bare floors, intended for analysis of inorganic metals like lead and organic compounds including pesticides and semi-volatile organic compounds (SVOCs). The practice has been validated for level loop and plush pile carpets as well as bare wood floors. It explicitly excludes elevated non-floor surfaces and is not designed for asbestos fiber detection. All measurements are reported in SI units, and the user must comply with relevant safety and regulatory requirements.
⚙️ Sampling Procedure and Equipment
The primary device is the High-Volume Small Surface Sampler (HVS3). This event-based sampling method requires recording the floor type, surface area sampled (in m² or cm²), and total dust mass collected (in g or mg). Between samples, all vacuum attachments must be cleaned per Section 13 of the standard to avoid carryover. The practice does not cover other vacuum attachments, composite bag sampling, or methods like wipe sampling (Practices D6966, D6661, D7144). Reference to these standards is provided for context, but they are not part of this practice.
Referenced standards supporting this practice include:
| 🟦 Reference | 📏 Title | ⚡ Key Aspect |
|---|---|---|
| D422 | Particle-Size Analysis of Soils | Soil particle size distribution |
| D1356 | Terminology for Sampling and Analysis of Atmospheres | Standard terms |
| D6661 | Field Collection of Organic Compounds from Surfaces Using Wipe Sampling | Organic compound sampling |
| D6966 | Collection of Settled Dust Samples Using Wipe Sampling for Metals | Metal sampling |
| D7144 | Collection of Surface Dust by Micro-vacuum for Metals and Metalloids | Micro-vacuum sampling |
💡 Practice Note: The success of this method relies on rigorous cleaning of the HVS3 between uses. Always follow the cleaning protocol in Section 13 to prevent cross-contamination and ensure sample integrity.
📊 Key Measured Properties and Data Requirements
Three principal metrics are derived from this practice: dust loading (mass per sampled area, e.g., g/m²), chemical dust concentration (mass of target analyte per mass of dust, e.g., μg/g), and chemical dust loading (mass of analyte per area, e.g., μg/m²). To compute these, the user must record floor type, the total area sampled, and the mass of dust retained. The practice mandates SI units throughout. Data recording should follow the template provided in Fig. 2 of the standard. Users are responsible for establishing appropriate safety, health, and environmental practices.
⚠️ Safety Advisory: This standard does not address all safety concerns. Users must evaluate risks, implement appropriate controls, and comply with applicable regulatory limitations prior to use.
❓ Frequently Asked Questions
🔍 What is the HVS3 sampler?
The High-Volume Small Surface Sampler (HVS3) is a specialized vacuum device designed to collect floor dust from a defined area for chemical analysis. It is the only sampler covered by this practice.
💡 Which floor surfaces can be sampled?
The practice is validated for level loop and plush pile carpets and bare wood floors. It is not applicable to elevated surfaces or for asbestos collection.
⚡ What analytes are targeted?
Target analytes include inorganic metals like lead and organic compounds such as pesticides and semi-volatile organic compounds (SVOCs).
📌 How does this compare to other methods?
This practice is specific to HVS3. Other methods like wipe sampling (D6966, D6661) or micro-vacuum (D7144) are not within scope. Method comparison is encouraged via field spikes or certified reference materials.