Computer controlled chamber measurements for clay adherence relevant for potential dioxin exposure through skin

Alesia Ferguson, Zoran Bursac, Wayne Johnson, Jasmine Davis

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

A computer-controlled mechanical chamber was used to control the contact between aluminum sheet samples laden with clay, and cotton sheet samples for the measurement of mass transfer. The contact parameters of pressure (20 to 60 kPa) and time (10 to 70 sec) were varied for 160 multiple experiments of mass soil transfer. Before log transformation the average transfer for First Transfer of clay particles was 34.4 ± 6.3 mg/8.97 cm 2 while that for Total Transfer was 36.1 ± 6.8 mg/8.97 cm 2. Second contact, therefore, resulted in an average transfer of 1.70 ± 0.76 mg/8.97 cm 2. These values are well above adherence values measured for potting soil and sand as reported for previous experiments using the same methodologies. Based on the univariate analysis and the multiple regression analysis we were able to see some effect of parameters on the clay adherence values. The effect of pressure increases was significant for the higher levels of 50 and 60 kPa. In addition, we observed that increases in temperature were significant for First Transfer, and less so for Total Transfer. Past experiments using potting soil and play sand show high adherence values to human cadaver skin over cotton sample; the same scenario would be expected for clay. This data set can be used to improve estimates of dermal exposure to dioxins found in ball clays often used by artisans in the making of pottery.

Original languageEnglish (US)
Pages (from-to)382-388
Number of pages7
JournalJournal of Environmental Science and Health - Part A Toxic/Hazardous Substances and Environmental Engineering
Volume47
Issue number3
DOIs
StatePublished - Feb 1 2012

Fingerprint

Skin
Clay
Soils
Cotton
Sand
Aluminum sheet
Experiments
Regression analysis
Mass transfer
Temperature

All Science Journal Classification (ASJC) codes

  • Environmental Engineering

Cite this

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abstract = "A computer-controlled mechanical chamber was used to control the contact between aluminum sheet samples laden with clay, and cotton sheet samples for the measurement of mass transfer. The contact parameters of pressure (20 to 60 kPa) and time (10 to 70 sec) were varied for 160 multiple experiments of mass soil transfer. Before log transformation the average transfer for First Transfer of clay particles was 34.4 ± 6.3 mg/8.97 cm 2 while that for Total Transfer was 36.1 ± 6.8 mg/8.97 cm 2. Second contact, therefore, resulted in an average transfer of 1.70 ± 0.76 mg/8.97 cm 2. These values are well above adherence values measured for potting soil and sand as reported for previous experiments using the same methodologies. Based on the univariate analysis and the multiple regression analysis we were able to see some effect of parameters on the clay adherence values. The effect of pressure increases was significant for the higher levels of 50 and 60 kPa. In addition, we observed that increases in temperature were significant for First Transfer, and less so for Total Transfer. Past experiments using potting soil and play sand show high adherence values to human cadaver skin over cotton sample; the same scenario would be expected for clay. This data set can be used to improve estimates of dermal exposure to dioxins found in ball clays often used by artisans in the making of pottery.",
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