METIS Scientific

Surface Decontamination of Aromatic Solids (Naphthalene) by DeconGel 1101

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Abstract
Surface decontamination efficacy determination of DeconGelTM 1101 on stainless steel, aluminum, and concrete surfaces contaminated with aromatic solids (naphthalene) 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
Naphthalene is a polycyclic aromatic hydrocarbon (PAH) that is volatile, readily subliming at room temperature. Naphthalene is the most abundant single component of coal tar, and is used as a chemical precursor to other chemicals, as a wetting agent/surfactant, and is used as a fumigant. Exposure to naphthalene may damage red blood cells, and the International Agency for Research on Cancer (IARC) classifies naphthalene as a potential carcinogen to animals and humans. Napthalene was chosen as a representative solid aromatic compound; DeconGel is expected to have similar efficacy towards the wide range of aromatic solids.

Summary Results

  • Excellent surface decontamination was achieved by applying DeconGel 1101 onto surfaces contaminated with aromatic solids (naphthalene) resulting in encapsulation of contaminants by DeconGel’s active components. Decontamination efficacies of DeconGel 1101 ranged from 99.2% (on concrete) to 99.6% (on stainless steel) to 99.2% (on aluminum) for Naphthalene 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 naphthalene as well as DeconGel components. When 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 utilized to ensure accurate decontamination efficacy determination of DeconGel.

Results:
Table 1 shows the decontamination efficacies of DeconGel 1101 on stainless steel, aluminum, and concrete surfaces contaminated with aromatic solids (naphthalene) as determined by residual swipe testing.

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