Fig. 3 shows the neutralization efficacies as a function of tested PPE and related material for the two highest-performing decontaminants (full strength bleach and RSDL1) against surfaces contaminated with malathion. For full strength bleach, no significant material dependence was observed as efficacy values were considered to be statistically identical (p values always >0.05 for all material pairings). For RSDL1, the neutralization of the acrylic material stood out with only 7% of the malathion remaining that would otherwise have been present if no decontamination occurred.
The material-dependent neutralization efficacies for Easy- Decon1 DF200 solution and foam for surfaces contaminated with carbaryl (Fig. 4) showed some material dependence with nitrile being the easiest to decontaminate with the EasyDecon1 DF200 solution (79% efficacy) while the foam version neutralized contaminants on the four materials with no distinct difference in efficacy. Due to the inability to properly neutralize EasyDecon1 DF200 in methanol extracts, the decontamination efficacy data for butyl, neoprene, and polyethylene materials were excluded from consideration.
Material dependence for the (on average) more efficacious full strength bleach solution against 2-CEES on various materials (Fig. 5) yielded efficacy values ranging from 22% (Viton1) to 35% (neoprene). No statistical differences were observed in efficacy when comparing materials. Efficacy data for butyl, nitrile, and polyethylene were not obtained due to experimental difficulties keeping the 2-CEES droplet on these three surface types. Within 10 min following application of 2-CEES, the surface of these three materials warped significantly, resulting in the inability to keep the chemical on these surfaces.
Fig. 6 shows the neutralization efficacy results for four decontamination solutions to decontaminate PPE and related materials contaminated with nitrobenzene, phenol, and chlordane. Bleach-containing products and Steriplex1 Ultra biocidal solution were not used in this evaluation. The four remaining decontami- nation technologies that were tested (detergent and water, EasyDecon1 DF200 solution/foam and RSDL1) did not yield high (better than 50%) efficacy values following a 2.0 min dwell time for any of the surfaces contaminated with nitrobenzene, phenol, or chlordane. The highest average efficacy values across tested materials were 8% for nitrobenzene with EasyDecon1 DF200 foam, 17% for phenol with EasyDecon1 DF200 foam, and 15% for chlordane with RSDL1. Some material dependence of these low stainless steel), or 31% (RSDL1 on stainless steel), respectively. Since chlordane was dissolved in ethanol (200 mg/mL), the ethanol may have facilitated the absorption of chlordane into a more permeable material. Similar to the malathion and carbaryl experiments, this impact is considered to be minimal as the deposited carbaryl remained on the surface based on visual inspection of the contaminated coupon materials.