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The effect of time of exposure and concentration of CCA preservative on the amount of arsenic absorbed into chicken skin from pressure-treated lumber.

CCA-treated wood, also known as pressure treated wood, is employed for a variety of uses, including playgrounds, picnic tables, fences, docks, utility poles, roller coasters, and decks. The wood is impregnated with a mixture of Cr[O.sub.3], CuO, and As[O.sub.5]. The copper serves as a fungicide, the arsenic serves as a pesticide, and the chromium fixes the arsenic and the copper to the wood. Recent studies have shown that the arsenic leaches out of the wood into the surrounding water and soil. It is possible that the children who are playing on playground structures and picnic tables constructed with CCA-treated lumber are absorbing arsenic into their skin. The purpose of this research was to determine the effect of time of exposure and concentration of the preservative on the amount of arsenic absorbed into skin. Chicken skin was used to simulate human skin. It was hypothesized that the higher the concentration of arsenic in the lumber and the longer the time of exposure, the greater the amount of arsenic that would be absorbed by the chicken skin. Pieces of chicken skin were exposed to treated-wood, then digested with sulfuric acid, nitric acid, and hydrogen peroxide. The samples were analyzed for arsenic concentration with an Atomic Absorption Spectrophotometer with a graphite furnace. The results of a two-way ANOVA indicated that the null hypothesis which stated that the chicken skin would not absorb more arsenic over increased periods of time was rejected, and the experimental hypothesis was supported. ([F.sub.0] = 23.74, [F.sub.(2,18)] = 3.55, p < 0.05). A Pearson Product Moment Correlation Analysis found moderately strong positive relationships between time of exposure and amount of arsenic absorbed (0.25 As/[ft.sup.3] r = 0.643, 0.40 As/[ft.sup.3] r = 0.740, 2.50 As/[ft.sup.3] r = 0.659).
Katherine D. Van Schaik
Spring Valley High School
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Author:Van Schaik, Katherine D.
Publication:Bulletin of the South Carolina Academy of Science
Article Type:Brief Article
Geographic Code:1USA
Date:Jan 1, 2002
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