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Evaluation of CODsed Analytical Methods for Domestic Freshwater Sediments: Comparison of Reliability and Correlationship between CODMn and CODCr Methods
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 Title & Authors
Evaluation of CODsed Analytical Methods for Domestic Freshwater Sediments: Comparison of Reliability and Correlationship between CODMn and CODCr Methods
Choi, Jiyeon; Oh, Sanghwa; Park, Jeong-Hun; Hwang, Inseong; Oh, Jeong-Eun; Hur, Jin; Shin, Hyun-Sang; Huh, In-Ae; Kim, Young-Hoon; Shin, Won Sik;
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In Korea, the chemical oxygen demand() in freshwater sediments has been measured by the potassium permanganate method used for marine sediment because of the absence of authorized analytical method. However, this method has not been fully verified for the freshwater sediment. Therefore, the use or modification of the potassium permanganate method or the development of the new analytical method may be necessary. In this study, two modified analytical methods such as the modified potassium permanganate method for and the modified closed reflux method using potassium dichromate for were compared. In the preliminary experiment to estimate the capability of the two oxidants for glucose oxidation, and were about 70% and 100% of theoretical oxygen demand(ThOD), respectively, indicating that was very close to the ThOD. The effective titration ranges in and were 3.2 to 7.5 mL and 1.0 to 5.0 mL for glucose, 4.3 to 7.5 mL and 1.4 to 4.3 mL for lake sediment, and 2.5 to 5.8 mL and 3.6 to 4.5 mL for river sediment, respectively, within 10% errors. For estimating recovery(%) in glucose-spiked sediment after aging for 1 day, the mass balances of the and among glucose, sediments and glucose-spiked sediments were compared. The recoveries of and were 78% and 78% in glucose-spiked river sediments, 91% and 86% in glucose-spiked lake sediments, 97% and 104% in glucose-spiked sand, and 134% and 107% in glucose-spiked clay, respectively. In conclusion, both methods have high confidence levels in terms of analytical methodology but show significant different concentrations due to difference in the oxidation powers of the oxidants.
Freshwater sediment;Chemical oxygen demand;;;;
 Cited by
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