Surface Decontamination of Chromium Compounds (Potassium Chromate (K2CrO4) by DeconGel 1101
Surface decontamination efficacy determination of DeconGelTM 1101 on stainless steel, carbon steel, and concrete surfaces contaminated with Potassium Chromate (K2CrO4) 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
Potassium chromate is a strong oxidizing agent and is used as a chemical indicator for chloride ion content. Potassium chromate is very toxic and may be fatal if swallowed, and can cause cancer on inhalation. Potassium chromate was chosen as a representative chromium compound for evaluating DeconGel’s efficacy; DeconGel is expected to have similar efficacy towards the wide range of chromium compounds.
- As seen in Table 1, excellent to acceptable surface decontamination was achieved by applying DeconGel 1101 onto contaminated surfaces, resulting in encapsulation of Chromium contaminant by DeconGel’s active components. Decontamination efficacies of poured DeconGel 1101 ranged from 91.9% (on concrete) to 99.2% (on carbon steel) to 99.6% (on stainless steel) as determined by residual swipe analysis.
- Potassium chromate was evidenced to react with concete surfaces, forming a fixed residue that was not able to be completely removed by DeconGel. Nevertheless, DeconGel showed acceptable decontamination efficacy of loose potassium chromate 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.
Table 1 shows the decontamination efficacies of DeconGel 1101 on stainless steel, carbon steel, and concrete surfaces contaminated with chromium compound (K2CrO4) as determined by residual swipe testing.