METIS Scientific

Surface Decontamination of PCBs (PCB-laden oil) by DeconGel 1101 and 1102

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Courtesy of METIS Scientific

Abstract

Field testing aboard the USS Missouri maritime museum vessel showed that excellent surface decontamination was achieved by applying DeconGel™ 1102 onto contaminated surfaces, resulting in encapsulation of PCB contaminant by DeconGel's active components. For all contaminated surfaces tested, EPA PCB limit standards (Regulations 761.79, 761.123) of < 10 ug/100 cm2 were achieved upon decontamination with DeconGel 1102. Additionally, 'in house' surface decontamination efficacy determination of DeconGel 1101 and 1102 on stainless steel, aluminum, and concrete surfaces contaminated with PCB (polychlorinated biphenyls) oil performed with GC/MS (Gas Chromatography/Mass Spectrometry) according to Environmental Protection Agency (EPA) SW-846 Methods: 3500C (Sampling) and 8270C (Analysis), demonstrated 100% efficacy on various substrates including concrete, aluminum, and stainless steel as determined by residual swipe analysis.

Hazardous Materials Relevance

PCBs were widely used as industrial dielectric additives in transformer and capacitor coolants and insulating fluids. Due to undesirable carcinogenicity, PCB production has been banned since the 1970s. PCBs are considered chemically inert and resist environmental degradation, and as such remain environmentally persistent pollutants.

Summary Results

  • USS Missouri maritime museum vessel contains several areas with limited access to the public due to PCB oil contamination. Field testing aboard the USS Missouri maritime museum vessel showed that excellent surface decontamination was achieved by applying DeconGel 1102 onto contaminated surfaces, resulting in encapsulation of PCB contaminant by DeconGel's active components. For all contaminated surfaces tested, EPA PCB limit standards (Regulations 761.79, 761.123) of < 10 ug/100 cm2 were achieved upon decontamination with DeconGel 1102. Table 1 below summarizes these results. • Additional 'in house' tests show that excellent surface decontamination was achieved by applying both DeconGel 1101 and 1102 via brushing onto contaminated surfaces, resulting in encapsulation of PCB contaminant by DeconGel's active components. Decontamination efficacies of brushed DeconGel 1101 & 1102 were 100% on concrete, aluminum, and stainless steel as determined by residual swipe analysis.
  • 'In house' tests show decontamination efficacies of poured DeconGel 1101 ranging from 83.9% (1st application) to 98.6% (2nd application, 3 days after 1s' application) to 98.8% (2nd application, 7 days after 1st application) on concrete, 92.4% on aluminum (one application), and 92.4% on stainless steel (one application), as determined by residual swipe analysis. Decontamination efficacies of poured DeconGel 1102 ranged from 87.2% (1SI application) to 98.8% (2nd application, 3 days after 1st application) to 99.0% (2°° application, 7 days after 1sl application) on concrete, 94.1% on aluminum (one application), and 94.1% on stainless steel (one application) 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 organic compounds dissolved in a suitable solvent able to completely solvate PCBs as well as DeconGel components. Additionally, analytical methods and associated equipment -GC column, GC gradient program, MS sample ionization parameters, PCB analyses for maritime museum vessel- were appropriately developed and outsourced to ensure accurate decontamination determination of DeconGel.

Results

Figure 1 below shows photos taken during the field testing aboard the USS Missouri PCB decontamination field testing. Table 1 shows the decontamination efficacies of DeconGel 1102 on multiple contaminated sites aboard the USS Missouri maritime museum vessel; Table 2 shows the decontamination efficacies of DeconGel 1101 and 1102 in 'in house' tests on stainless steel, aluminum, and concrete surfaces contaminated with PCB oil as determined by residual swipe testing.

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