Surface decontamination efficacy determination of DeconGelTM 1101 and 1102 on aluminum, stainless steel, and concrete surfaces contaminated with Crude Oil (polyaromatic hydrocarbons fraction) was performed with LC/MS (Liquid Chromatography/Mass Spectrometry) according to Environmental Protection Agency (EPA) SW-846 Methods: 3500C (sampling), 8321B (analysis), and 1654A (Analysis of PAH Content of Oil).
Hazardous Materials Relevance
Crude oil is used throughout the world as an energy source, and is used to provide a broad range of valuable and useful materials. Crude oil and its decomposition products are environmentally persistent toxins, and when released into the environment require extensive remediation typically resulting in the generation of large quantities of toxic contamination. Crude oil is comprised of 0.2-7% polyaromatic hydrocarbons (PAHs), widespread organic pollutants known for their carcinogenic, mutagenic, and tetratogenic properties.
- As seen in Table 1, excellent surface decontamination was achieved by applying DeconGel 1101 and 1102 both via brushing or pouring (non-brushed) onto contaminated surfaces, resulting in encapsulation of Crude oil contaminant by DeconGel’s active components. Decontamination efficacies of poured DeconGel 1101 ranged from 85.9% (on concrete) to 93.9% (on aluminum) to 93.9% (on stainless steel), brushed DeconGel 1101 ranged from 98.4% (on concrete) to 99.0% (on stainless steel) to 99.1% (on aluminum), as determined by residual swipe analysis. Decontamination efficacies of poured DeconGel 1102 ranged from 86.6% (on concrete) to 91.3% (on stainless steel) to 94.1% (on aluminum), brushed DeconGel 1102 ranged from 98.9% (on concrete) to 99.5% (on stainless steel) to 99.6% (on aluminum), 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 organics in polar solvent solvated samples. When necessary, the digestion methods were customized to result in the complete dissolution of the organic contaminants and to ensure accurate decontamination efficacy determination of DeconGel.
Table 1 shows the decontamination efficacies of DeconGel 1101 on stainless steel, aluminum, and concrete surfaces contaminated with Crude oil as determined by residual swipe testing.