The surface decontamination efficacy determination of DeconGelTM 1101 on stainless steel, aluminum, carbon steel, and concrete surfaces contaminated with cadmium compounds (cadmium chloride (CdCl2) and cadmium oxide (CdO)) 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
Cadmium metal and cadmium compounds are highly toxic. Cadmium chloride is often used in the process of making cadmium sulfide, a common yellow pigment while cadmium oxide is a conductive material used in the making of photovoltaic cells and photodiodes. Cadmium compounds are known carcinogens (classified A2 by ACGIH1) and fatal inhalation hazards. It is important to contain and remove cadmium particles which can become airborne. Cadmium chloride and cadmium oxide were chosen as representative cadmium compounds for evaluating DeconGel’s efficacy; DeconGel is expected to have similar efficacy towards the wide range of cadmium compounds.
- Excellent surface decontamination was achieved by applying DeconGel 1101 onto surfaces contaminated with cadmium (cadmium chloride and cadmium oxide) resulting in encapsulation of contaminants by DeconGel’s active components. Decontamination efficacies of DeconGel 1101 ranged from 99.5% and 100% (on stainless steel), to 98.5% and 100% (carbon steel) to 97.6% and 98.4% (on concrete) as determined by residue 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 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 cadmium chloride and cadmium oxide as determined by residual swipe testing.