토양에 유입된 카드뮴, 구리, 아연의 시간에 따른 분배 계수의 변화 = Aging Effects On Partitioning Coefficients of Cd, Cu, and Zn in Metal-spiked Soils

다국어 초록 (Multilingual Abstract)

Temporal changes of metal solubility have been repeatedly observed in soils equilibrated with metal salt solutions. This phenomenon is known as aging, yet factors that affect the degree of metal aging remain largely unexamined. In this study, we compared the extent of aging on metal partitioning depending on soil, metal, and metal loading. Five soils spiked with four levels of Cd (2.5-20 mg kg-1), Cu, and Zn (50-400 mg kg-1) salt solutions were aged in the laboratory up to 1 year. The partitioning coefficient (Kd) of each metal was calculated from the ratio of total to dissolved metal concentration in samples collected at times ranging from 1 day to 1 year. The highest Kd values for Cd, Cu and Zn were recorded in a Histosol, Andisol, and fine-textured Alfisol, respectively, whereas the lowest Kd was recorded for an Oxisol and coarse-textured Alfisol. For all soils, a pattern of increasing Kd with aging was evident for Cd and Zn, but not Cu. Rapid Cu sorption was limited when dissolved organic matter was high in soils. In highly-retentive soils, Kd values seemed to be insensitive to metal loading, although a longer period was required for the higher metal loadings to reach the same degree of metal aging as the lower loadings. In soils with low sorption capacity, the Kd values were determined more by metal loading than by aging. Therefore, marked differences can be expected in the degree of metal aging in spiked soils by the soil type, metal and amount of metal added.

국문 초록 (Abstract)

금속이 염 용액 형태로 토양에 유입될 때, 그 금속의 용해도는 시간이 지남에 따라 감소하는 경향(aging)을 보이는데, 이
러한 시간 의존성 외에 토양 내 금속 용해도의 변화에 영향을 미치는 또 다른 요인들에 대한 고찰은 아직 미비한 상
태이다. 본 연구에서는 물리화학적 성질이 다른 5 종류의 토양 (히스토졸, 앤디졸, 옥시졸, 미세입자 알피졸, 조대입자
알피졸)에 여러 비율의 카드뮴(2.5-20 mg kg−1)/ 구리(50-400 mg kg−1)/ 아연(50-400 mg kg−1) 염 용액을 혼합하여, 상
온에서 1년 동안 토양의 성질, 금속의 종류, 금속의 농도에 따른 용해도 변화관찰을 시도하였다. 그 결과, 히스토졸에
서는 카드뮴이, 앤디졸에서는 구리가, 미세입자 알피졸에서는 아연이 가장 높은 분배 계수를 보였고, 옥시졸과 조대입
자 알피졸에서는 모든 금속들이 가장 낮은 분배 계수를 나타내었다. 또한, 카드뮴과 아연의 경우 토양의 종류와는 무
관하게 시간에 따른 분배 계수의 증가를 보였지만, 구리의 경우 토양 내 유입된 후 일주일 부터는 이러한 경향성를
찾아보기 어려웠다. 구리는 토양의 유기물이 많을 경우에는 빠른 흡착성을 보이지만, 토양수에 녹아있는 유기물이 많
을 경우에는 그 흡착 특성이 제한됨을 관찰하였다. 더욱이, 흡수력이 높은 토양의 경우 금속의 분배 계수는 유입된

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