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KMID : 0895420140240040462
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Journal of Korean Society of Occupational and Enviromental Hygiene
2014 Volume.24 No. 4 p.462 ~ p.470
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Particle Size-Related Dust and Quartz Concentration of Stone Grinding Operations
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Kim Sung-Hwan
Bae Hye-Jeong
Jung Jong-Hyeon
Phee Young-Gyu
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Abstract
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Objectives: The purpose of this study was to evaluate quartz concentrations in airborne respirable dust and particle size-related quartz concentrations.
Methods: Respirable dust samples were collected using a 10 mm Dorr-Oliver nylon cyclone equipped with a 37 mm, 5 ㎛ pore size PVC filter. Dust samples were collected with a Marple’ personal cascade impactor from stone grinding operations in five stone-related business located in the Gyeongsangbuk-do area.
Results: The geometric mean of quartz concentration in the respirable dust was 0.170 ㎎/㎥, and the rate of exceeding the Korean Occupational Exposure Limit(KOEL) was 93.3%. The quartz concentration by particle size shows that it was the highest(0.115 ㎎ /㎥) in stage 5(3.50-6.00 ㎛), which corresponds with the size of respirable particle. The smaller the particle sizes were, the higher quartz the content became. The mass fractions of inhalable, thoracic, and respirable dust were 72.1%, 36.0%, and 14.4%.
Conclusions: The rate of the quartz concentration in respirable dust from stone grinding operations exceeding the American Conference of Governmental Industrial Hygienists Threshold Limit Values was 100%, which means proper work environmental management is required through regular working environmental measurements. Given that the stone grinding operations had a higher small size dust concentrations, there is a need to reduce respirable dust, such as through wet operation and local exhaust ventilation.
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KEYWORD
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particle distribution, quartz, stone grinding operation
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