Surface decontamination efficacy determination of DeconGelTM 1101 on stainless steel, carbon steel, and concrete surfaces contaminated with a cyanide compound (potassium ferricyanide) 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
Cyanide can cause acute toxicity through skin contact, ingestion, and inhalation. Potassium ferricyanide (K3[Fe(CN)6]) is an iron-containing compound possessing similar physical characteristics to potassium cyanide (KCN), a water soluble form of cyanide. Cyanide is utilized in gold and silver mining and electroplating industrial applications. Both ACGIH1 and NIOSH2 have set maximum exposure limits for cyanide compounds. Potassium ferricyanide was chosen as a representative cyanide compound for evaluating DeconGel’s efficacy; DeconGel is expected to have similar efficacy towards the wide range of cyanide compounds.
- Excellent surface decontamination was achieved by applying DeconGel 1101 onto surfaces contaminated with cyanide compounds resulting in encapsulation of contaminants by DeconGel’s active components. Decontamination efficacies of DeconGel 1101 ranged from 98.2% (on concrete) to 98.9% (on carbon steel) to 99.4% (on stainless steel) as determined by 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.
Table 1 and shows the decontamination efficacies of DeconGel 1101 on stainless steel, carbon steel, and concrete surfaces contaminated with cyanide as determined by residual swipe testing.