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D6234-13 – Standard Test Method Technical Guide
🧪 Scope and Application of D6234-13
This standard test method describes the shake extraction of mining waste using the Synthetic Precipitation Leaching Procedure (SPLP). It is specifically designed for mining waste containing at least 80 % dry solids (equivalent to ≤20 % moisture). The primary objective is to generate a leachate solution to determine inorganic constituents under standardized conditions that simulate acidic precipitation.
The method is explicitly limited to single batch extractions. It does not address all sampling, sample preservation, or analytical requirements that may be associated with its application. All values stated in SI units are regarded as the standard.
💡 Technical Note: This test method is widely referenced for evaluating the leaching potential of inorganic constituents from mining waste under conditions simulating acidic precipitation for regulatory waste characterization programs.
⚙️ Shake Extraction Procedure and Fluid pH
The procedure involves shaking a known weight of mining waste with an acidic extraction fluid of a specified composition. The critical operational parameter is the pH of the extraction fluid, which must reflect the pH of acidic precipitation in the geographic region where the waste will be disposed.
As described in USEPA Method 1312, typical pH values are 4.2 for sites east of the Mississippi River and 5.0 for sites west of the Mississippi River. Users may consult state and federal environmental agencies for region-specific data.
⚠️ Critical Precondition: If the pH of the laboratory water is less than the desired target pH for the site, do not use this test method. In such cases, Practice D3987 (Shake Extraction with Water) or Test Method E2242 must be used instead (see Note 1 of the standard).
| 🟦 Parameter | 📏 Specification |
|---|---|
| Waste Solid Content Requirement | ≥ 80 % dry solids (≤ 20 % moisture) |
| Extraction Fluid pH (East of Mississippi River) | 4.2 |
| Extraction Fluid pH (West of Mississippi River) | 5.0 |
| Extraction Type | Single Batch |
| Target Analytes | Inorganic Constituents |
📚 Referenced Documents and Methodological Framework
D6234 is supported by a comprehensive network of ASTM standards guiding sampling, precision determination, and alternative extraction methodologies. Users should consult the full list of referenced documents in Section 2 of the standard for complete context.
| 📐 Standard | 🎯 Application |
|---|---|
| D3987 | Shake Extraction of Solid Waste with Water |
| D5744 | Laboratory Weathering Using a Humidity Cell |
| E2242 | Alternative SPLP Method for Specific Regulatory Requirements |
| D1193 | Specification for Reagent Water |
| E691 | Conducting an Interlaboratory Study for Precision Determination |
Other referenced practices, such as D2234/D2234M for coal sampling and E877 for iron ores, provide guidance on obtaining representative samples for testing.
❓ Frequently Asked Questions
🔍 What types of waste are suitable for this test method?
This test method is specifically intended for mining waste containing at least 80 % dry solids (no more than 20 % moisture). It is not designed for slurries or high-moisture materials without significant modification to the procedure.
💡 How is the pH of the extraction fluid determined?
The pH must reflect the acidic precipitation of the disposal region, as defined by USEPA Method 1312 or local environmental agencies. Typical values are 4.2 (east of the Mississippi River) and 5.0 (west of the Mississippi River).
⚡ What should be done if the lab water pH is lower than the target extraction pH?
Per Note 1 of the standard, if the pH of the laboratory water is less than the desired target pH, do not use this method. Instead, use Practice D3987 (Shake Extraction with Water) or Test Method E2242.
📌 Is this method suitable for sequential or multiple batch extractions?
No. Section 1.3 explicitly states this test method is intended solely for performing single batch extractions only. It does not cover the requirements for sequential leaching procedures.