Abstract
This study was performed to identify and quantify asbestos fibers released from two types of asbestos-cement slate roofs. One is a plant roof installed in 1987 which contained 15% chrysotile, and 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 falling water harvested from 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 soil around asbestos-cement slate roofs was from 217 to 348 f/g. With above results, excess lifetime cancer risk (ELCR) for risk assessment of 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 levels do not exceed the acceptable risk(1.0E-05) recommended by WHO. The asbestos concentration in air, drained rainfall and soil around plant slate roof was higher than that around residential slate roof, but excess lifetime cancer risk (ELCR) from residential slate was higher than that from plant slate. This suggested that enclose and encapsulation of residential roofs have priority in removal policy to minimize exposure risk.
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