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D5037-90 – Standard Test Method Technical Guide
🔬 Test Method Overview
This test method, designated D5037-90, provides a procedure for the qualitative comparison of petroleum oils recovered from water or beaches with those from suspected sources using high performance liquid chromatography (HPLC). A dilute solution of the oil in acetonitrile is injected onto a reverse phase column and developed isocratically with acetonitrile. The column effluent is monitored by dual photometric flow cells: ultraviolet (UV) and fluorescence detectors, yielding two independent profiles per sample for enhanced comparison.
| 🔬 Component | 📌 Detail |
|---|---|
| Mobile Phase | Acetonitrile |
| Column Type | Reverse Phase |
| Elution Method | Isocratic |
| Detectors | UV and Fluorescence |
💡 Tip: Using both UV and fluorescence detectors provides comprehensive data from a single analysis, enhancing the accuracy of source identification by offering two independent oil profiles.
⚙️ Key Procedures and Significance
The standard requires that samples from a spill be compared with known oils from possible sources. It is applicable to both weathered and unweathered oils, as well as those subjected to simulated weathering. Identification is based on visual comparison of the entire chromatogram, considering weathering trends such as evaporation, dissolution, emulsification, oxidation, and biological decomposition. The unknown oil is compared with chromatograms of possible source samples obtained at identical instrumental settings on the same apparatus. A match of the full chromatogram indicates a common source. This method is essential for identifying the source of petroleum oil spills, with dual detection offering significantly more comparative information.
| 📖 Term | 📚 Definition |
|---|---|
| Waterborne Oil | Petroleum-derived oil carried by a water system, often at the surface but may be emulsified or dissolved. |
| Weathering | Processes including evaporation, dissolution, emulsification, oxidation, and biological decomposition. |
⚠️ Safety Precaution: Users must establish appropriate safety and health practices. Refer to Section 9 of the standard for specific hazard statements and precautions before use.
❓ Frequently Asked Questions
🔍 What is the scope of this test method?
It covers the qualitative comparison of petroleum oils from water or beaches with suspected source oils using HPLC under specified conditions.
💡 Can weathered oils be analyzed?
Yes, the test method applies to both weathered and unweathered samples, with consideration of weathering trends like evaporation and dissolution during chromatogram matching.
⚡ How are results from dual detectors used?
The UV and fluorescence detectors produce two independent chromatograms for each sample, which are compared with those from possible source samples for more reliable identification.
📌 What is the basis for identification?
Identification is made by visual comparison of the entire sample chromatogram with chromatograms of possible source samples obtained under identical instrumental conditions on the same apparatus.