Surface decontamination efficacy determination of DeconGel™ 1101 on stainless steel, aluminum, and concrete surfaces contaminated with Organic Acids (benzoic acid (BA)) was performed with LC/MS (Liquid Chromatography/Mass Spectrometry) according to Environmental Protection Agency (EPA) SW-846 Methods: 3500C (sampling) and 8321B (analysis).
Hazardous Materials Relevance
BA is an aromatic carboxylic acid used as a food preservative and as industrial chemical feedstock used to prepare flavors, insect repellents, and plasticizers. As with other organic acids, benzoic acid is acidic, an irritant, and can be corrosive to sensitive tissues including mucous membranes and the gastrointestinal tract. Benzoic acid was chosen as a representative organic acid; DeconGel is expected to have similar efficacy towards the wide range of organic acids.
- Excellent surface decontamination was achieved by applying DeconGel 1101 onto surfaces contaminated with organic acids (benzoic acid) resulting in encapsulation of contaminants by DeconGel's active components. Decontamination efficacies of DeconGel 1101 ranged from 98.4% (on concrete) to 99.7% (on stainless steel) to 99.8% (on aluminum) for BA 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 organic compounds dissolved in a suitable solvent able to completely solvate BA as well as DeconGel components. When deemed necessary, experimental methods were customized to afford complete dissolution of organic contaminants. Additionally, analytical methods and associated equipment (LC column, LC gradient program, MS sample ionization parameters) were appropriately developed to ensure accurate decontamination efficacy determination of DeconGel.
Table 1 shows the decontamination efficacies of DeconGel 1101 on stainless steel, aluminum, and concrete surfaces contaminated with Organic Acids (BA) as determined by residual swipe testing.