We describe the application of near-infrared spectroscopy with partial least-squares (PLS) multivariate calibration to determine the total organic carbon (TOC) content of aqueous organic samples. We demonstrate
a standard error of precision of approximately 0.50 mg/mL for the TOC content in aqueous organic mixtures of Na3HEDTA, Na4EDTA, and acetone. The precision of the simulta3 neous determination of each component
in these samples is 1.66 mg/ mL (0.0044 M) for Na3HEDTA, 2.62 mg/mL (0.0063 M) for Na4EDTA, and 0.38 mg/mL (0.0065 M) for acetone. Transmission spectra were collected by using a 1 mm pathlength and approximately
1 min collection time in the 6250-5450 cm-1 (1.60-1.83 mu m) region, corresponding to the first C-H overtone band. This analysis procedure was developed to ease TOC determination for hazardous aqueous wastes
such as those found at the DOE Hanford site.
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)