Surface decontamination efficacy determination of DeconGelTM 1101 and 1102 on stainless steel, floor tile, and concrete surfaces contaminated with aromatic liquids (toluene) was performed using LC/MS (Liquid Chromatography/Mass Spectrometry) according to Environmental Protection Agency (EPA) SW-846 Methods: 3500C (sampling) and 8321B (analysis).
Hazardous Materials Relevance
Toluene is a volatile aromatic hydrocarbon widely used as a solvent, industrial feedstock, and as an octane booster in gasoline fuels. If inhaled ingested, or internalized «i large quantities, toluene can cause neurological, liver, and kidney damage, unconsciousness, and death. Toluene was chosen as a representative aromatic liquid: DeconGel is expected to have similar efficacy towards the wide range of aromatic liquids.
- 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 toluene contaminant by DeconGel's active components. Decontamination efficacies of poured DeconGel 1101 ranged from 99.5% (on concrete) to 99.8% (on floor tile) to 99.8% (on stainless steel), brushed DeconGel 1101 ranged from 100% (on concrete) to 100% (on floor tile) to 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 100% (on stainless steel), brushed DeconGel 1102 ranged from 100% (on concrete) to 100% (on floor tile) to 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 toluene 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.
Table 1 shows the decontamination efficacies of DeconGel 1101 and 1102 on stainless steel, floor tile, and concrete surfaces contaminated with aromatic liquids (toluene) as determined by residual swipe testing.