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D5315-04 – Standard Test Method Technical Guide
🧪 Scope and Applicability of ASTM D5315-04
ASTM D5315-04 (Reapproved 2024) defines a high-performance liquid chromatographic (HPLC) test method for the determination of specific N-methyl-carbamoyloximes and N-methylcarbamates. This test method is applicable to ground water and finished drinking water, targeting any carbamate analyte that can be hydrolyzed to a primary amine. The method has been validated in a collaborative round-robin study and estimated detection limits (EDLs) have been established for each listed analyte.
💡 Important User Guidance: This test method is restricted to analysts experienced in liquid chromatography and chromatogram interpretation (Section 1.3). When analyzing unfamiliar samples, identifications should be confirmed by at least one additional qualitative technique (Section 1.4). The values stated in SI units are to be regarded as standard.
🟦 Validated Analytes and Registry Numbers
| 🏷️ Analyte | 🔢 CAS Registry Number |
|---|---|
| Aldicarb | 116-06-3 |
| Aldicarb sulfone | 1646-88-4 |
| Aldicarb sulfoxide | 1646-87-3 |
| Baygon (Propoxur) | 114-26-1 |
| Carbaryl | 63-25-2 |
| Carbofuran | 1563-66-2 |
| 3-Hydroxycarbofuran | 16655-82-6 |
| Methiocarb | 2032-65-7 |
| Methomyl | 16752-77-5 |
| Oxamyl | 23135-22-0 |
⚙️ Analytical Methodology and Core Requirements
This method employs Direct Aqueous Injection (DAI) coupled with High-Performance Liquid Chromatography (HPLC). Following chromatographic separation, a post-column derivatization step hydrolyzes the target analytes to primary amines, which are then detected fluorometrically. This technique provides high sensitivity and selectivity for the specified carbamates in challenging aqueous matrices.
📏 Method Specifications
| 📐 Parameter | ⚡ Specification |
|---|---|
| Standard Designation | D5315 −04 (Reapproved 2024) |
| Analytical Technique | Direct Aqueous Injection HPLC with Post-Column Derivatization |
| Target Analytes | N-Methyl-Carbamoyloximes & N-Methylcarbamates |
| Validated Matrices | Ground water & Finished drinking water |
| Detection Principle | Hydrolysis to primary amine, fluorescence detection |
| Units | SI Units |
⚠️ Practical Considerations: Observed detection limits may vary between ground waters depending on the nature of interferences in the sample matrix and the specific instrumentation used. The standard references Practices D3370 (Sampling from Flowing Process Streams) and D3694 (Preparation of Sample Containers and Preservation of Organic Constituents) for proper sample handling. Reagent water must conform to Specification D1193.
📊 Validation, Precision, and Detection Limits
Standard D5315-04 has been thoroughly validated through a collaborative round-robin study documented in the standard. Estimated Detection Limits (EDLs) have been determined for all ten validated analytes and are detailed in Table 1 of the official standard. Each analyst must demonstrate proficiency with the method using the procedure described in Section 12.3 before conducting sample analysis.
🟢 Quality Control Framework: The standard also references Practice D2777 for determination of precision and bias of applicable test methods, and Practice E682 for liquid chromatography terms and relationships. Additional laboratory safety guidance is available in references (3-5) cited within the standard.
❓ Frequently Asked Questions
🔍 What is the scope of ASTM D5315?
The test method is specifically applicable to the determination of certain N-methyl-carbamoyloximes and N-methylcarbamates in ground water and finished drinking water using Direct Aqueous Injection HPLC with Post-Column Derivatization.
💡 How does the post-column derivatization work for detection?
The post-column derivatization step hydrolyzes the carbamate analytes into primary amines. These amines are then reacted to form fluorescent derivatives, allowing for highly sensitive and selective quantification of the target compounds.
⚡ Who is qualified to use this standard method?
Section 1.3 of the standard restricts this test method to use by, or under the supervision of, analysts experienced in both the use of liquid chromatography and the interpretation of liquid chromatograms.
📌 Which key ASTM standards are referenced for sampling?
The standard directly references Practices D3370 for sampling water from flowing process streams and D3694 for preparation of sample containers and preservation of organic constituents.