Dermal absorption of chemicals: estimation by IH SkinPerm

Area of Science:

• Occupational Health
• Toxicology
• Mathematical Modeling

Background:

• Dermal absorption is a critical exposure route in occupational settings.
• Quantitative Structure-Activity Relationships (QSARs) and differential equations form the basis of dermal absorption models.
• Accurate estimation of dermal absorption is essential for risk assessment.

Purpose of the Study:

• To introduce and describe the IH SkinPerm mathematical tool for estimating dermal absorption.
• To demonstrate the practical application of IH SkinPerm in occupational dermal exposure assessments.
• To validate the IH SkinPerm model's accuracy against experimental data.

Main Methods:

• Development of the IH SkinPerm model based on QSARs and differential equations.
• Simulation of three occupational dermal absorption scenarios: splash, liquid deposition, and vapor exposure.
• Inputting substance properties, exposure duration, and affected skin area into the model.
• Comparison of IH SkinPerm's estimated dermal absorbed dose with published volunteer study data.

Main Results:

• IH SkinPerm successfully simulates various occupational dermal absorption scenarios.
• Simulations using vapor absorption data showed estimated dermal absorbed doses within a factor of 3 of reported values.
• The model accounts for substance volatility and evaporated mass, providing real-time graphical and numerical outputs.
• Required input parameters include substance mass, physicochemical properties, exposure duration, and skin surface area.

Conclusions:

• IH SkinPerm is a valuable mathematical tool for estimating dermal absorption in occupational settings.
• The model provides a reliable and scientifically sound method for assessing dermal exposure risks.
• IH SkinPerm's ability to simulate different exposure types and provide real-time data enhances its utility for risk management.