Characterization of Hazardous Aqueous Samples by Near-IR Spectroscopy
Abstract:We describe the application of near-infrared spectroscopy to determine the chemical composition of aqueous samples that simulate hazardous wastes at the DOE Hanford site. Surrogate liquid mixtures are prepared with compositions similar to the actual Hanford liquid wastes. We demonstrate a standard error of precision of approximately 0.06 M for NaNO3 and NaNO2, 0.006 M for Na3HEDTA, and 0.009 M for Na2CO3 by using a 1 mm pathlength and approximately 1 min collection time in the 9000-5400 cm-1 (1.11-1.85 mu m) region. Even though most of these electrolytes do not possess characteristic near-infrared bands suitable for quantitative analysis, the use of partial least-squares multivariate calibration makes it possible to correlate spectral differences, based on perturbations in the near-IR water spectrum, and determine each component concentration. The effects of the electrolytes and temperature on the water spectrum are discussed.
Document Type: Research Article
Publication date: January 1, 1999
More about this publication?
- The Society publishes the internationally recognized, peer reviewed journal, Applied Spectroscopy, which is available both in print and online. Subscriptions are included with membership or can be purchased by institutional or corporate organizations. Abstracts may be viewed free of charge. Previously published as Bulletin (Society for Applied Spectroscopy)
- Editorial Board
- Information for Authors
- Submit a Paper
- Subscribe to this Title
- Membership Information
- Request copyrighted SAS materials
- Spectroscopic Nomenclature
- Focal Point (Open Access)
- ingentaconnect is not responsible for the content or availability of external websites