Surface decontamination efficacy determination of DeconGel™ 1101 on stainless steel, carbon steel, and concrete surfaces contaminated with zinc compounds (elemental zinc powder (Zn), zinc oxide (ZnO), and zinc acetate (Zn(02CCH3)2)) 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
Zinc compounds are common industrial compounds and are used as anti-corrosive agents and in the semi conductors and batteries Industries. Zinc compounds are irritants if inhaled and may cause flu-like symptoms known as 'metal fume fever'. Zinc powder, zinc oxide, and zinc acetate were chosen as representative zinc compound for evaluating DeconGel's efficacy; DeconGel is expected to have similar efficacy towards the wide range of zinc compounds.
- Acceptable to excellent surface decontamination was achieved by applying DeconGel 1101 onto surfaces contaminated with zinc compounds resulting in encapsulation of contaminants by DeconGel's active components. Decontamination efficacies of DeconGel 1101 ranged from greater than 86.5% (on concrete) to greater than 66.9% (on carbon steel) to greater than 77.3% (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 inorganic compounds in aqueous samples. When necessary, experimental methods were customized to afford complete dissolution of inorganic contaminants, and to ensure accurate decontamination efficacy determination of DeconGel.
- Due to the corrosive nature of zinc powder, DeconGel surface decontamination was not found to be exceptional on steel (carbon and stainless steel) surfaces due to zinc powder's ability to react with these surfaces, forming a fixed residue that was not able to be completely removed by DeconGel. Nevertheless, DeconGel showed acceptable decontamination efficacy of loose zinc powder contamination from such surfaces.
Tables 1 through 3 show the decontamination efficacies of DeconGel 1101 on stainless steel, carbon steel, and concrete surfaces contaminated with elemental zinc powder (Zn), zinc oxide (ZnO), and zinc acetate (Zn(02CCH3)2) as determined by the residual swipe testing method.