Microwave sample preparation for analysis of metals in environmental samples
- OI Analytical, College Staion, TX (United States)
The unique nature of microwave energy enhances heating efficiency and improves acid digestion sample preparation. Faster sample preparation and improved precision of the analysis occur. These results will be illustrated in this presentation using various standard reference materials and environmentally important samples. The analytical microwave system used offers accurate temperature and pressure feedback control through the use of a hand-held controller or PC-based control. Digestions are performed in patented, user-friendly microwave vessels. USEPA Method 3015, {open_quotes}Microwave-Assisted Acid Digestion of Aqueous Samples and Extracts,{close_quotes} is properly performed when the sample is heated to 170{degrees}C within 10 minutes, and maintained for an additional 10 minutes. USEPA Method 3051, {open_quotes}Microwave-Assisted Acid Digestion of Sediments, Sludges, Soils, and Oils,{close_quotes} is properly performed when the sample is heated to 175{degrees}C within 5.5 minutes, and maintained at 175{degrees}C for an additional 4.5 minutes. After the timesaving microwave digestion period, the samples were analyzed for metals by ICP-AES. Excellent accuracy and precision were obtained, in addition to 90% time reduction when using microwave sample preparation.
- OSTI ID:
- 369986
- Report Number(s):
- CONF-960376--
- Country of Publication:
- United States
- Language:
- English
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