METIS Scientific

Surface Decontamination of Tin compounds (tributyltin chloride) by DeconGel 1101

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Abstract
Surface decontamination efficacy of DeconGel™ 1101 on stainless steel, aluminum, and concrete surfaces contaminated with tin compound (tributyltin chloride); experimentation and associated analyses 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
Tin compounds (organotin) have been extensively used as biocides, wood preservatives, and as anti-biofouling agents, however, concerns over potent toxicity to marine life have led to a worldwide ban by the International Maritime Organization. Organotin compounds are considered environmentally persistent pollutants.

Summary Results

  • As seen in Table 1, excellent surface decontamination was achieved by applying DeconGel 1101 via brushing onto contaminated surfaces, resulting in encapsulation of organotin contaminant by DeconGel's active components. Decontamination efficacies of brushed DeconGel 1101 ranged from 99.0% (on concrete) to 99.3% (on aluminum) to 99.4% (on stainless steel) as determined by residual swipe analysis; decontamination efficacies of poured DeconGel 1101 ranged from 86.9% (on concrete) to 96.2% (on stainless steel) to 96.3% (on aluminum) 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 inorganics/organometallics in aqueous/polar aprotic solvated samples. When necessary, the digestion methods were customized to result in the complete dissolution of the inorganic contaminants and to ensure accurate decontamination efficacy determination of DeconGel.

Results
Table 1 shows the decontamination efficacies of DeconGel 1101 on stainless steel, aluminum, and concrete surfaces contaminated with organotin compound (tributyltin chloride) as determined by residual swipe testing.

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