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완전분해와 전분해 방법에 의한 영산강,섬진강수계 퇴적물의 중금속농도 상관관계
오다연(Da Yeon Oh),최경균(Kyoung Kyoon Choi),허인애(In Ae Huh),황인성(In Seong Hwang),김영훈(Young Hoon Kim),허진(Jin Hur),신현상(Hyun Sang Shin),오정은(Jeong Eun Oh),신원식(Won Sik Shin),박정훈(Jeong Hun Park) 大韓環境工學會 2011 대한환경공학회지 Vol.33 No.1
본 연구에서는 완전분해와 전분해 전처리 방법에 따른 중금속 농도 사이에 대한 상관관계를 알아보고자 하였다. 영산강·섬진강 수계 하천 및 호소에서 총 43점의 퇴적물 시료를 채취하여, 두 방법으로 전처리하고 5성분의 금속(Cd, Cr, Ni, Pb, Zn)을 분석하였다. 전체적인 중금속의 평균농도는 Zn>Cr>Pb>Ni>Cd 순으로 나타났으며, 전분해 값은 완전분해 값의 35.0% (Cd), 53.8% (Cr), 66.2% (Ni), 64.4% (Pb), 76.4% (Zn)로 완전분해시 중금속 농도가 높게 나타났다. 호소의 중금속 농도가 하천의 농도보다 높게 나타났다. 완전분해와 전분해 농도 사이의 상관관계식을 구하였으며, 강한 상관관계를 가지는 것을 나타난 Zn 및 Ni의 경우 완전분해 농도가 증가할 경우 왕수에 의한 용출농도도 같이 증가하는 것으로 나타났다. 나머지 중금속들에서도 두 분해법에 의한 퇴적물의 중금속농도 사이에 보통이상의 선형상관관계가 있는 것으로 나타났다. 본 연구결과는 퇴적물의 불균질성으로 인해 제한적으로 응용될 수 있을 것으로 판단된다. In this study, the correlations of concentrations in sediment heavy metals between two pretreatment methods, total digestion and aqua regia digestion, have been investigated. Total 43 samples had been collected from streams and lakes in Yeongsan and Seomjin watersheds. They were decomposed in two pretreatment methods and five metal components (Cd, Cr, Ni, Pb, Zn) were analyzed. Overall average concentrations of heavy metals were Zn>Cr>Pb>Ni>Cd in the order. The concentrations of aqua regia digestion were 35.0% (Cd), 53.8% (Cr), 66.2% (Ni), 64.4% (Pb) and 76.4% (Zn) of the concentrations of total digestion and heavy metal concentrations of total digestion were higher. Heavy metal concentrations in sediments from lakes were higher than those from streams. The correlation equations between the concentrations of total digestion and aqua regia digestion were obtained. The concentrations of Zn and Ni, which showed strong linear correlations, increased in aqua regia digestion as the concentration in total digestion increased. The linear correlation coefficients between two digestion methods for most analyzed metals were above the average correlation. However, these results can be applied with limitations due to heterogeneity of sediments.
국내 담수퇴적물의 CODsed 분석방법 평가: CODMn법과 CODCr법의 신뢰성 및 상관성 비교
최지연 ( Ji Yeon Choi ),오상화 ( Sang Hwa Oh ),박정훈 ( Jeong Hun Park ),황인성 ( In Seong Hwang ),오정은 ( Jeong Eun Oh ),허진 ( Jin Hur ),신현상 ( Hyun Sang Shin ),허인애 ( In Ae Huh ),김영훈 ( Young Hoon Kim ),신원식 ( Won Sik 한국환경과학회 2014 한국환경과학회지 Vol.23 No.2
In Korea, the chemical oxygen demand(COD(sed)) 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 COD(sed) analytical method may be necessary. In this study, two modified COD(sed) analytical methods such as the modified potassium permanganate method for COD(Mn) and the modified closed reflux method using potassium dichromate for COD(Cr) were compared. In the preliminary experiment to estimate the capability of the two oxidants for glucose oxidation, COD(Mn) and COD(Cr) were about 70% and 100% of theoretical oxygen demand(ThOD), respectively, indicating that COD(Cr) was very close to the ThOD. The effective titration ranges in COD(Mn) and COD(Cr) 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 COD(sed) recovery(%) in glucose-spiked sediment after aging for 1 day, the mass balances of the COD(Mn) and COD(Cr) among glucose, sediments and glucose-spiked sediments were compared. The recoveries of COD(Mn) and COD(Cr) 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 COD(sed) concentrations due to difference in the oxidation powers of the oxidants.