Dong, Pan, MISSOURI UNIVERSITY OF SCIENCE AND TECHNOLOGY, United States; Julia, Kuebrich, MISSOURI UNIVERSITY OF SCIENCE AND TECHNOLOGY, United States; Glenn, Morrison, Missouri Univeristy of Science and Technology, United States
The production of methamphetamine releases harmful chemicals into the air, which can then diffuse into and accumulate within the building structure. The risk to future occupants lies in the later ‘re-emission’ of chemicals from the building structure that lead to methamphetamine absorbing into furnishings, clothing, children’s toys. Soiling of personal items with skin oil can increase the absorption capacity, thereby increasing potential exposure to methamphetamine by dermal and oral routes. In this research, we exposed clothing, skin oil contaminated clothing, furnishings, and children’s toys to vapor phase methamphetamine in a laboratory chamber. By measuring the mass of methamphetamine absorbed in these materials, and the time required to approach equilibrium, we were able to determine the relationship between the concentration in air (40ppb) and that which will accumulate in furnishings, clothing, skin oil, and children’s toys. We found that skin oil might affect the time-dependent absorption of methamphetamine, although we did not observe a statistical difference at equilibrium on cotton clothing. Skin oil soiled cloth reached an equilibrium concentration of 25µg/100 cm2 ppb, while the clean cloth was over 15µg/100cm2/ppb for a 27 day duration of exposure. Different materials absorb different amounts of methamphetamine, ranging from an equilibrium value of over 50µg/100cm2/ppb for upholstery fabric to 3.75µg/100cm2/ppb for a fleece baby blanket for an exposure duration of 31 days. We predict that there is a risk of children ingesting more than the California reference dose of 0.3µg/kg/day if they are mouthing materials equilibrated with very low air concentrations of methamphetamine.