Improved skin decontamination efficacy for the nerve agent VX

Area of Science:

• Toxicology
• Dermatology
• Chemical Warfare Agents

Background:

• Early skin decontamination is critical to prevent systemic toxicity from chemical agents.
• Reactive Skin Decontamination Lotion (RSDL) is effective, but optimal protocols require further investigation.
• Current recommendations may not maximize RSDL efficacy for specific agents like VX.

Purpose of the Study:

• To evaluate various RSDL protocols for removing VX from human skin in vitro.
• To compare the efficacy of RSDL procedures against simple soap and water washing.
• To determine the impact of prolonged contact time and repeated application on decontamination effectiveness.

Main Methods:

• In vitro testing of neat VX on human skin.
• Evaluation of multiple RSDL application protocols, including swabbing and contact time.
• Comparison with standard soap and water decontamination.
• Analysis of agent penetration over time following decontamination.

Main Results:

• RSDL protocols with repeated swabbing and a 10-minute contact time showed the highest efficacy.
• Repeating RSDL application 2 hours after initial decontamination led to transient increased penetration followed by rapid decline.
• Soap and water washing significantly increased VX penetration, likely due to skin hydration and dilution.

Conclusions:

• Slightly extended RSDL procedures, particularly with longer contact times, enhance nerve agent removal efficacy.
• Repeated RSDL application may be beneficial but requires careful timing to avoid increased penetration.
• Low-water-content decontamination procedures are recommended for nerve agents.