• Reduction of 2,4,6-Trinitrotoluene Mobility in Operational Range Soil by Sorption Enhancement and Desorption Decrease Using Monopotassium Phosphate and Montmorillonite
  • Jung, Jae-Woong;Yu, Gihyeon;Nam, Kyoungphile;
  • Gyeongnam Department of Environmental Toxicology and Chemistry, Korea Institute of Toxicology;R&D Center, OIKOS Co., Ltd.;Department of Civil and Environmental Engineering, Seoul National University;
  • 제일인산칼륨과 몬트모릴로나이트 점토를 이용한 사격장 토양 내 2,4,6-trinitrotoluene의 흡착증진 및 탈착감소에 의한 이동성 저감 연구
  • 정재웅;유기현;남경필;
  • 안전성평가연구소 경남환경독성본부;오이코스 R&D Center;서울대학교 건설환경공학부;
Abstract
Mobility reduction of 2,4,6-trinitrotoluene (TNT) was tested by amending monopotassium phosphate (MKP) and montmorillonite to a firing range soil contaminated with TNT. While addition of MKP enhanced sorption of TNT on soil matrix, and combined use of MKP with montmorillonite significantly decreased desorption of TNT as well as remarkably increased the TNT sorption. Montmorillonite amendment by 5% of soil mass resulted in TNT desorption of 0.12 mg/kg from soil loaded with 9.93 mg/kg-TNT. The decrease of TNT desorption was proportional to the amount of montmorillonite amended. At 10 and 15% amendment, only 0.79 and 1.23 mg/kg-TNT was desorbed from 29.33 and 48.80 mg/kg-TNT. In addition, the leaching of TNT with synthetic precipitation leaching procedure (SPLP) and hydroxypropyl-${\beta}$-cyclodextrin (HPCD) decreased, indicating that TNT in MKP/montmorillonite-treated soil became more stable and less leachable. The results demonstrate that addition of MKP and montmorillonite to TNT-contaminated soil reduces the mobility of TNT from soil not only by increasing TNT sorption, but also decreasing TNT desorption. It was found that MKP and montmorillonite amendments by 5 and 10% of soil mass, respectively, were optimal for reducing the mobility of soil TNT.

Keywords: 2,4,6-Trinitrotoluene;Monopotassium phosphate;Montmorillonite;Desorption;

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