유기물 산화율과 부유물질이 총 유기탄소(TOC) 분석방법(고온연소와 UV/과황산)에 미치는 영향 비교
Comparison of the Efficiency of Organic Oxidation and the Effect of Suspended Solid Particles in the High Temperature Combustion and UV/Persulfate Oxidation Methods for TOC Analysis
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In this study, we investigate some differences and similarities between the two widely used TOC oxidation methods, ultraviolet persulfate (UVP) and high temperature combustion (HTC) oxidation method in terms of standard parameters, the oxidation efficiency of organic compounds and the effect of suspended solid (SS) particles. The UVP method yields about 2?3 times better precisions with lower detection limits and showed higher values of TOC (>13%) in the sewage effluent samples (TOC = 2~6, SS = 2~6 mg/L), compared to HTC. On average, both UVP and HTC methods yield good TOC recoveries (>95.8%) for 12 organic compounds, except some chemically recalcitrant molecules (Congo red, Caffeine, Lignin etc.). Comparison of TOC values for the water samples containing sewage sludge particles (SS = 10~50 mg/L) confirmed that the HTC method is preferred in the TOC analysis for the samples containing more than 10 mg/L of SS particles, in which the TOC recoveries (%) for the samples are 61.5±3.8% for HTC and 22.6~51.6% for UVP, respectively. The results of this study demonstrate that the two different TOC oxidation methods yield comparable results when analyzing typical environmental water samples containing low concentration of SS (i.e., <~6 mg/L), and the effect of SS particles was discussed with regard to improving the measurement efficiency of particulate organic carbon (POC) in water.
Abstract
In this study, we investigate some differences and similarities between the two widely used TOC oxidation methods, ultraviolet persulfate (UVP) and high temperature combustion (HTC) oxidation method in terms of standard parameters, the oxidation efficiency of organic compounds and the effect of suspended solid (SS) particles. The UVP method yields about 2?3 times better precisions with lower detection limits and showed higher values of TOC (>13%) in the sewage effluent samples (TOC = 2~6, SS = 2~6 mg/L), compared to HTC. On average, both UVP and HTC methods yield good TOC recoveries (>95.8%) for 12 organic compounds, except some chemically recalcitrant molecules (Congo red, Caffeine, Lignin etc.). Comparison of TOC values for the water samples containing sewage sludge particles (SS = 10~50 mg/L) confirmed that the HTC method is preferred in the TOC analysis for the samples containing more than 10 mg/L of SS particles, in which the TOC recoveries (%) for the samples are 61.5±3.8% for HTC and 22.6~51.6% for UVP, respectively. The results of this study demonstrate that the two different TOC oxidation methods yield comparable results when analyzing typical environmental water samples containing low concentration of SS (i.e., <~6 mg/L), and the effect of SS particles was discussed with regard to improving the measurement efficiency of particulate organic carbon (POC) in water.
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