제일인산칼륨과 몬트모릴로나이트 점토를 이용한 사격장 토양 내 2,4,6-trinitrotoluene의 흡착증진 및 탈착감소에 의한 이동성 저감 연구

Abstract

Mobility reduction of 2,4,6-trinitrotoluene (TNT) was tested by amending monopotassium phosphate (MKP) andmontmorillonite to a firing range soil contaminated with TNT. While addition of MKP enhanced sorption of TNT on soilmatrix, and combined use of MKP with montmorillonite significantly decreased desorption of TNT as well as remarkablyincreased the TNT sorption. Montmorillonite amendment by 5% of soil mass resulted in TNT desorption of 0.12 mg/kgfrom soil loaded with 9.93 mg/kg-TNT. The decrease of TNT desorption was proportional to the amount ofmontmorillonite amended. At 10 and 15% amendment, only 0.79 and 1.23 mg/kg-TNT was desorbed from 29.33 and48.80 mg/kg-TNT. In addition, the leaching of TNT with synthetic precipitation leaching procedure (SPLP) andhydroxypropyl-β-cyclodextrin (HPCD) decreased, indicating that TNT in MKP/montmorillonite-treated soil became morestable and less leachable. The results demonstrate that addition of MKP and montmorillonite to TNT-contaminated soilreduces the mobility of TNT from soil not only by increasing TNT sorption, but also decreasing TNT desorption. It wasfound that MKP and montmorillonite amendments by 5 and 10% of soil mass, respectively, were optimal for reducing themobility of soil TNT.