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Estimating Contaminant Dose for Intermittent Dermal Contact: Model Development, Testing, and Application

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  • W. J. Riley
  • T. E. McKone
  • E. A. Cohen Hubal

Abstract

Assessments of aggregate exposure to pesticides and other surface contamination in residential environments are often driven by assumptions about dermal contacts. Accurately predicting cumulative doses from realistic skin contact scenarios requires characterization of exposure scenarios, skin surface loading and unloading rates, and contaminant movement through the epidermis. In this article we (1) develop and test a finite‐difference model of contaminant transport through the epidermis; (2) develop archetypal exposure scenarios based on behavioral data to estimate characteristic loading and unloading rates; and (3) quantify 24‐hour accumulation below the epidermis by applying a Monte Carlo simulation of these archetypal exposure scenarios. The numerical model, called Transient Transport through the epiDERMis (TTDERM), allows us to account for variable exposure times and time between exposures, temporal and spatial variations in skin and compound properties, and uncertainty in model parameters. Using TTDERM we investigate the use of a macro‐activity parameter (cumulative contact time) for predicting daily (24‐hour) integrated uptake of pesticides during complex exposure scenarios. For characteristic child behaviors and hand loading and unloading rates, we find that a power law represents the relationship between cumulative contact time and cumulative mass transport through the skin. With almost no loss of reliability, this simple relationship can be used in place of the more complex micro‐activity simulations that require activity data on one‐ to five‐minute intervals. The methods developed in this study can be used to guide dermal exposure model refinements and exposure measurement study design.

Suggested Citation

  • W. J. Riley & T. E. McKone & E. A. Cohen Hubal, 2004. "Estimating Contaminant Dose for Intermittent Dermal Contact: Model Development, Testing, and Application," Risk Analysis, John Wiley & Sons, vol. 24(1), pages 73-85, February.
    • Handle: RePEc:wly:riskan:v:24:y:2004:i:1:p:73-85
    DOI: 10.1111/j.0272-4332.2004.00413.x
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    References listed on IDEAS

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    1. H. Frederick Frasch, 2002. "A Random Walk Model of Skin Permeation," Risk Analysis, John Wiley & Sons, vol. 22(2), pages 265-276, April.
    2. Thomas E. McKone & Robert A. Howd, 1992. "Estimating Dermal Uptake of Nonionic Organic Chemicals from Water and Soil: I. Unified Fugacity‐Based Models for Risk Assessments," Risk Analysis, John Wiley & Sons, vol. 12(4), pages 543-557, December.
    3. James N. McDougal & Julia L. Jurgens‐Whitehead, 2001. "Short‐Term Dermal Absorption and Penetration of Chemicals from Aqueous Solutions: Theory and Experiment," Risk Analysis, John Wiley & Sons, vol. 21(4), pages 719-726, August.
    4. A. Roy & C. P. Weisel & P. J. Lioy & P. G. Georgopoulos, 1996. "A Distributed Parameter Physiologically‐Based Pharmacokinetic Model for Dermal and Inhalation Exposure to Volatile Organic Compounds," Risk Analysis, John Wiley & Sons, vol. 16(2), pages 147-160, April.
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