Economic and Environmental Geology (자원환경지질)

The Korean Society of Economic and Environmental Geology (대한자원환경지질학회)
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The Statistical Study on the Effects of Physicochemical Properties of Soil on Single Extraction Methods for Heavy Metals

토양의 물리화학적 특성이 중금속 단일용출법에 미치는 영향에 대한 통계학적 연구

  • Han, Hyeop-Jo (Department of Energy and Resources Engineering, Chonnam National University) ;
  • Song, Chang-Woo (Department of Energy and Resources Engineering, Chonnam National University) ;
  • Lee, Jong-Un (Department of Energy and Resources Engineering, Chonnam National University)
  • 한협조 (전남대학교 에너지자원공학과) ;
  • 송창우 (전남대학교 에너지자원공학과) ;
  • 이종운 (전남대학교 에너지자원공학과)
  • Received : 2021.03.24
  • Accepted : 2021.04.09
  • Published : 2021.04.28
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Abstract

The effects of the physicochemical properties of soil such as soil pH, cation exchange capacity, and organic matter content on single extraction of Cd, Cr, Cu, Ni, Pb, and Zn using CaCl2, HOAc, HNO3, and DTPA were statistically investigated for 69 agricultural soils in Korea. Correlation analysis and multiple regression analysis were applied for soil samples which were grouped on the basis of average values of the physicochemical properties of the soil. Diluted HNO3 extracted higher concentrations of Cr, Cu, Ni, and Pb when compared with the other extractants, however, similar amounts of Cd and Zn were extracted by HOAc with HNO3. The results of correlation analysis indicated that DTPA extraction showed a high correlation with other single and pseudo-total extraction methods, and the physicochemical properties of soil influenced the concentrations of heavy metals leached by the single extraction methods. In the case of Zn, high correlations between pseudo-total and the studied single extraction methods were observed. As a result of regression analysis, it was found that the physicochemical properties of the soil could explain up to 74% of variances of the single extraction results. These results indicate that the physicochemical properties of the soil can have a direct influence on the concentrations of heavy metals extracted by the single extraction methods.

국내 69개 농경지 토양 내 Cd, Cr, Cu, Ni, Pb, Zn을 대상으로 하여 토양 pH, 양이온교환능력, 유기물 함량 등의 물리화학적 특성이 CaCl2, HOAc, HNO3, DTPA 등을 이용한 중금속의 단일용출 결과에 미치는 영향을 통계학적으로 조사하였다. 통계학적 분석은 토양의 물리화학적 특성의 평균값을 기준으로 높고 낮은 두 표본으로 구분한 후 이에 대해 상관분석과 다중회귀분석을 수행하였다. Cr, Cu, Ni, Pb의 경우 HNO3를 적용하였을 때 다른 추출제에 비하여 높은 함량이 추출되었으나, Cd, Zn의 경우 HOAc를 이용한 추출에서도 유사한 함량이 추출되었다. 상관관계 조사 결과, DTPA 추출이 다른 단일용출 및 전함량과 상관관계가 높았으며, 토양의 물리화학적 특성이 단일용출 결과에 영향을 미치는 것으로 나타났다. Zn의 경우, 전함량과 모든 단일용출법들에 의한 추출 함량이 상호 높은 상관관계를 보였다. 회귀분석 결과, 토양의 물리화학적 특성은 최대 74%에 이르는 단일용출 결과의 분산을 설명할 수 있는 것으로 나타났다. 이러한 결과는 토양의 물리화학적 특성이 단일용출 결과에 직접적인 영향을 미칠 수 있음을 나타낸다.

Keywords

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