| Title |
Influences of Environmental Conditions and Refractory Organic Matters on Organic Carbon Oxidation Rates Measured by a High Temperature Combustion and a UV-sulfate Methods |
| Authors |
정헌재 ( Heon Jae Jung ) ; 이보미 ( Bo Mi Lee ) ; 이근헌 ( Keun Heon Lee ) ; 신현상 ( Hyun Sang Shin ) ; 허진 ( Jin Hur ) |
| DOI |
https://doi.org/10.15681/KSWE.2016.32.1.98 |
| Keywords |
Dissolved Organic Matter; DOM; Fluorescence; High temperature combustion; Spectroscopic indices; Total Organic Carbon; TOC; UV-persulfate |
| Abstract |
This study examined the effects of environmental conditions and the presence of refractory organic matter on oxidation rates of total organic carbon (TOC) measurements based on high temperature combustion and ultraviolet-sulfate methods. Spectroscopic indices for prediction of oxidation rates were also explored using the UV spectra and fluorescence excitationemission matrix (EEM) of humic acids. Furthermore, optimum TOC instrument conditions were suggested by comparing oxidation rates of a standard TOC material under various conditions. Environmental conditions included salts, reduced ions, and suspended solids. Salts had the greatest influence on oxidation rates in the UV-sulfate method. However, no effect was detected in the high temperature combustion method. The UV-sulfate method showed lower humic substance oxidation rates, refractory natural organic matter, compared to the other methods. TOC oxidation rates for the UV-sulfate method were negatively correlated with higher specific-UV absorbance, humification index, and humic-like EEM peak intensities, suggesting that these spectroscopic indices could be used to predict TOC oxidation rates. TOC signals from instruments using the UV-sulfate method increased with increasing chamber temperature and increasing UV exposure durations. Signals were more sensitive to the former condition, suggesting that chamber temperature is important for improving the TOC oxidation rates of refractory organic matter. |