슬레이트 지붕 노후화에 따른 석면 섬유 방출량 (Releasing of asbestos fibers from the weathered asbestos cement slate roofing)

서지정보

· 발행기관 : 한국산업보건학회
· 수록지 정보 : 한국산업보건학회지 / 20권 / 2호 / 88 ~ 93페이지
· 저자명 : 김현욱, 박계영, 한진구, 한영선, 황범구, 이준혁

초록

To confirm and quantify asbestos fibers released from the asbestos-cement slate roofs due to weathering, three houses, selected based on the year of built - 60's, 70, and 80's, were investigated. All of them were located in the downtown of Seoul. Rain or snow-melt water was collected from the roof in a 3.5 liter plastic bottle. A known amount of collected water was filtered on the 37 mm membrane filter, ashed in a muffle furnace, and subsequently treated with HCl to remove organic material. The treated remaining was refiltered on a 25mm membrane filter for PLM and PCM analyses. The NIOSH 7400method was utilized for PCM counting. In addition, SEM/EDX was used to confirm the asbestos types.
The results of this study showed that chrysotile fibers were confirmed by PLM in all samples analyzed. A significant amount of asbestos fibers were found in the water samples. The ranges of asbestos fibers counted from the samples collected in the 60's, 70's, and 80's were; 10,406.3~55,575.6 f/L,5,218.8~38,126.2 f/L, and 2,906.3~7,798.6 f/L, respectively.
As anticipated, concentrations of asbestos fibers increased with time of installment of the roofing material.
We conclude that weathering can be a significant factor on the release of asbestos fibers from the asbestos cement products.
Since asbestos fibers released into environment can be a source of significant health hazard, countermeasures, such as replacement, removal, and encapsulation of weathered asbestos slate, should be initiated immediately.

영어초록

To confirm and quantify asbestos fibers released from the asbestos-cement slate roofs due to weathering, three houses, selected based on the year of built - 60's, 70, and 80's, were investigated. All of them were located in the downtown of Seoul. Rain or snow-melt water was collected from the roof in a 3.5 liter plastic bottle. A known amount of collected water was filtered on the 37 mm membrane filter, ashed in a muffle furnace, and subsequently treated with HCl to remove organic material. The treated remaining was refiltered on a 25mm membrane filter for PLM and PCM analyses. The NIOSH 7400method was utilized for PCM counting. In addition, SEM/EDX was used to confirm the asbestos types.
The results of this study showed that chrysotile fibers were confirmed by PLM in all samples analyzed. A significant amount of asbestos fibers were found in the water samples. The ranges of asbestos fibers counted from the samples collected in the 60's, 70's, and 80's were; 10,406.3~55,575.6 f/L,5,218.8~38,126.2 f/L, and 2,906.3~7,798.6 f/L, respectively.
As anticipated, concentrations of asbestos fibers increased with time of installment of the roofing material.
We conclude that weathering can be a significant factor on the release of asbestos fibers from the asbestos cement products.
Since asbestos fibers released into environment can be a source of significant health hazard, countermeasures, such as replacement, removal, and encapsulation of weathered asbestos slate, should be initiated immediately.

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