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KMID : 1024520150240070927
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Journal of the Environmental Sciences
2015 Volume.24 No. 7 p.927 ~ p.937
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Comparison on the Releasing Characteristics of Asbestos Fiber from Plant Slate Roof and House Slate Roof
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Jeong Jae-Won
Yoo Eun-Chul
Lee Sang-Jonn
Park Geun-Tae
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Abstract
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This study was performed to identify and quantify the asbestos fibers released from two types of asbestos-cement slate roofs. One is a plant roof installed in 1987 which contained 15% chrysotile, and the other is a residential roof installed before 1983 which contained 12% chrysotile. The concentrations of asbestos fibers in air surrounding asbestos-cement slate roofs and in the falling water harvested from the same roofs on rainy days ranged from 0.0012 to 0.0018 f/mL and from 1,764 f/L to 10,584 f/L, respectively. The concentration of inorganic fibers in the soil around asbestos-cement slate roofs was from 217 to 348 f/g. With the above results, the excess lifetime cancer risk (ELCR) for the risk assessment of the asbestos fibers released from asbestos-cement slate based on US EPA IRIS (Integrated risk information system) model is within 5.5E-06 ~ 6.5E-06 levels which indicates that the levels do not exceed "the acceptable risk(1.0E-05)" recommended by WHO. The asbestos concentration in air, drained rainfall and soil around the plant slate roof was higher than that around residential slate roof, but the excess lifetime cancer risk (ELCR) from residential slate was higher than that from plant slate. This suggested that the enclose and encapsulation of residential roofs have priority in removal policy to minimize the exposure risk.
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KEYWORD
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Asbestos-cement slate roof, Airborne fibers, Drained rainwater from asbestos slate, The excess lifetime cancer risk(ELCR)
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