Abiotic transformation of TNT in montmorillonite and soil suspensions under reducing conditions

Abstract Abiotic reduction of nitrobenzenes by Fe +2 adsorbed to various surfaces has been demonstrated by others. The objective of this study was to describe abiotic TNT transformation as a function of pH and confirm the possibility of an abiotic Fe +2 reduction pathway in reduced soils.Effects of pH on abiotic transformations of TNT were examined in buffered batch tests with montmorillonite and Fe +2 . Results indicated that TNT was rapidly reduced under abiotic conditions, with the rate of reduction highest at pH 8. Mass balance experiments indicated that unextractable or unknown transformation products were produced. Suppression of the abiotic Fe +2 reduction mechanism in anaerobic soil by complexing Fe +2 with EDTA demonstrated the presence of the pathway in a soil.

[1]  Stefan B. Haderlein,et al.  Specific Adsorption of Nitroaromatic Explosives and Pesticides to Clay Minerals , 1996 .

[2]  D. Kaplan,et al.  Thermophilic biotransformations of 2,4,6-trinitrotoluene under simulated composting conditions , 1982, Applied and environmental microbiology.

[3]  J. Bollag,et al.  Enzyme-mediated coupling of 3,4-dichloroaniline and ferulic acid: a model for pollutant binding to humic materials. , 1994, Environmental science & technology.

[4]  R. Schwarzenbach,et al.  Environmental Processes Influencing the Rate of Abiotic Reduction of Nitroaromatic Compounds in the Subsurface , 1995 .

[5]  Charolett A. Hayes,et al.  Effect of Redox Potential and pH on TNT Transformation in Soil-Water Slurries , 1997 .

[6]  K. Thorn,et al.  Covalent Binding of Aniline to Humic Substances. 2. 15N NMR Studies of Nucleophilic Addition Reactions , 1996 .

[7]  R. Schwarzenbach,et al.  Abiotic Reduction of 4-Chloronitrobenzene to 4-Chloroaniline in a Dissimilatory Iron-Reducing Enrichment Culture , 1993, Applied and environmental microbiology.

[8]  H. Knackmuss,et al.  BASIC KNOWLEDGE AND PERSPECTIVES ON BIODEGRADATION OF 2,4,6-TRINITROTOLUENE AND RELATED NITROAROMATIC COMPOUNDS IN CONTAMINATED SOIL , 1995 .

[9]  Judith C. Pennington,et al.  Adsorption and Desorption of 2,4,6-Trinitrotoluene by Soils , 1990 .

[10]  R. Spalding,et al.  Groundwater munition residues and nitrate near Grand Island, Nebraska, U.S.A. , 1988 .

[11]  J C Spain,et al.  Biodegradation of nitroaromatic compounds. , 2013, Annual review of microbiology.

[12]  R. Schwarzenbach,et al.  Reduction of Substituted Nitrobenzenes by Fe(II) in Aqueous Mineral Suspensions. , 1995, Environmental science & technology.

[13]  R. Schwarzenbach,et al.  Reduction of nitroaromatic compounds coupled to microbial iron reduction in laboratory aquifer columns. , 1995, Environmental science & technology.

[14]  S. D. Harvey,et al.  Relationship Between the Leachability Characteristics of Unique Energetic Compounds and Soil Properties , 1993 .

[15]  R. Schwarzenbach,et al.  Adsorption of substituted nitrobenzenes and nitrophenols to mineral surfaces , 1993 .

[16]  R. Crawford,et al.  Initial-phase optimization for bioremediation of munition compound-contaminated soils , 1993, Applied and environmental microbiology.

[17]  K. Thorn,et al.  Covalent binding of aniline to humic substances. 1. Kinetic studies , 1996 .