Surface decontamination efficacy determination of DeconGel 1101 on stainless steel, carbon steel, concrete, Lexan, and rubber surfaces contaminated with elemental copper and copper (I) oxide (Cu2O) was performed with ICP-OES (Inductively Coupled Plasma-Optical Emission Spectroscopy) according to Environmental Protection Agency (EPA) SW-846 Methods: 3005A (sampling) and 6010C (analysis).
Hazardous Materials Relevance
Copper and its compounds such as copper (I) oxide are commonly used as components of semiconductors, pigments, fungicides, and as antifouling agents for marine paints. Due to its toxicity toward aquatic organisms, copper is considered an environmentally persistent pollutant. Elemental copper and copper (I) oxide were chosen as a representative copper compounds for evaluating DeconGel’s efficacy; DeconGel is expected to have similar efficacy towards the wide range of copper compounds.
- As seen in Tables 1 and 2, excellent surface decontamination was achieved by applying DeconGel 1101 onto contaminated surfaces, resulting in encapsulation of Copper contaminants by DeconGel’s active components. Decontamination efficacies of DeconGel 1101 on copper elemental ranged from 98.0% (on concrete) to 99.4% (on rubber) to 99.5% (on Lexan) to 99.5% (on carbon steel) to 99.9% (on stainless steel) as determined by residual swipe analysis; decontamination efficacies of DeconGel 1101 on copper (I) oxide ranged from 94.7% (on concrete) to 98.9% (on carbon steel) to 99.7% (on stainless steel) as determined by residual swipe analysis.
- Copper (I) oxide was evidenced to react with concrete surfaces, forming a fixed residue that was not able to be completely removed by DeconGel. Nevertheless, DeconGel showed acceptable decontamination efficacy of loose copper (I) oxide contamination from such surfaces.
- Optimized experimental and analytical methods were successfully developed following standardized EPA sampling and analysis methods as guidelines for determination of inorganic compounds in aqueous samples. When deemed necessary, experimental methods were customized to afford complete dissolution of inorganic contaminants, and to ensure accurate decontamination efficacy determination of DeconGel.
Tables 1 and 2 show the decontamination efficacies of DeconGel 1101 on stainless steel, carbon steel, and concrete surfaces contaminated with copper compound (Cu2O) as determined by residual swipe testing.