METIS Scientific

Surface Decontamination of Halogenated Solvents (Tetrachloroethylene) by DeconGel 1101 and 1102

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Abstract
Surface decontamination efficacy determination of DeconGelTM 1101 and 1102 on stainless steel, floor tile, and concrete surfaces contaminated with halogenated solvents (tetrachloroethylene (TCE)) was performed with LC/MS (Liquid Chromatography/Mass Spectrometry) according to Environmental Protection Agency (EPA) SW-846 Methods: 3500C (sampling) and 8321B (analysis).

Hazardous Materials Relevance
TCE is a volatile chlorinated hydrocarbon widely used as a solvent, dry-cleaning fluid, and degreaser. TCE is a common soil contaminant and is an environmentally persistent pollutant. TCE is classified as a carcinogen, and is a skin irritant and central nervous system depressant. TCE was chosen as a representative halogenated solvent; DeconGel is expected to have similar efficacy towards the wide range of halogenated solvents.

Summary Results

  • Excellent surface decontamination was achieved by applying both DeconGel 1101 and 1102, both via brushing or pouring (non-brushed) onto contaminated surfaces, resulting in encapsulation of TCE contaminant by DeconGel’s active components. Decontamination efficacies of poured DeconGel 1101 ranged from 100% on concrete to 100% on floor tile to 99.6% on stainless steel, brushed DeconGel 1101 were 100% on concrete, 100% on floor tile and 100% on stainless steel, as determined by residual swipe analysis. Decontamination efficacies of poured DeconGel 1102 ranged from 100% (on concrete) to 100% (on floor tile) to 99.5% (on stainless steel), brushed DeconGel 1102 were 100% on concrete, 100% on floor tile, and 100% on stainless steel, as determined by residual swipe analysis.
  • Optimized experimental and analytical methods were successfully developed following standardized EPA sampling and analysis methods as guidelines for determination of organic compounds dissolved in a suitable solvent able to completely solvate TCE as well as DeconGel components. When deemed necessary, experimental methods were customized to afford complete dissolution of organic contaminants. Additionally, analytical methods and associated equipment (LC column, LC gradient program, MS sample ionization parameters) were appropriately developed to ensure accurate decontamination efficacy determination of DeconGel.

Results
Table 1 shows the decontamination efficacies of DeconGel 1101 and 1102 on stainless steel, floor tile, and concrete surfaces contaminated with halogenated solvents (tetrachloroethylene) as determined by residual swipe testing.

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