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The aim of this study is to determine exposure levels as well as compliance status on respirable dust and respirable crystalline silica (RCS)-quartz exposure among crusher operators at Malaysian quarries. The exposure level at each crushing process was compared. Monitoring was performed among 70 crusher operators at nine quarries. Eight hours long-term personal samples were collected according to the National Institute of Occupational Safety and Health (NIOSH) Manual Analytical Method (NMAM) 0600 for respirable dust and NMAM 7500 for respirable crystalline silica (RCS-quartz). A questionnaire on silica dust monitoring and control was also sent to all granite quarries in Malaysia. The results indicated that the mean percentage of RCS-quartz in silica dust was 23.7%. The mean value for crusher operators exposure was 0.426mgm3 for respirable dust and 0.091mgm3 for RCS-quartz. Around 30.5% of crusher operators were exposed to RCS-quartz levels above the permissible exposure limit (PEL) based on Malaysians Occupational Safety and Health Regulations 2000. Operators in charge of combined secondary and tertiary crusher plants were exposed to 0.116mgm3 of RCS-quartz, which was higher compared to those operating individual plants. Results on posted questionnaire indicate that Malaysian quarries are more preferred to perform respirable dust monitoring (37%) instead of specific RCS-quartz monitoring (22.6%). Low exposure to respirable dust may conceal the need to justify comprehensive crystalline silica dust monitoring and lead to underestimation of RCS-quartz exposure. A high percentage of non-compliance exposure on personal RCS-quartz exposure should establish the need for quarry management to focus on better implementation of dust control systems.
Brown TP, Rushton LAP (2005) Mortality in the UK industrial silica sand industry: 1. Assessment of exposure to respirable crystalline silica. J Occup Environ Med 62:442445. doi:10.1136/oem.2004.017715
Goh E, Lazim AT (2010) Advance in industrial dust control management. In: Goh E, Lazim AT, Lin CN, Lip MM, Fat LK, Devi N (eds) Quarries and Quarrying: Sustainable Developement, Green Technology and Best Practice Institute of Quarrying Malaysia, Selangor, pp 243262
IARC (1997) Silica, some silicates, coal dust and para-aramid fibrils: IARC monographs on the evaluation of carcinogenic risks to humans vol 68. International Agency for Research Cancer (IARC), World Health Organization(WHO), Lyon
IARC (2012) International Agency for Research on Cancer. Silica dust, crystalline, in the form of quartz or cristobalite in silica, some silicate, coal dust and para-aramid fibril, IARC Monographs Evaluation Carcinogen Risk to Human. Link: http://monographs.iarc.fr/ENG/Monographs/vol100C/mono100C.pdf
Liu Y, Steenland K, Rong Y, Hnizdo E, Huang X, Zhang H, Shi T, Sun Y, Wu T, Chen W (2013) Exposure-response analysis and risk assessment for lung cancer in relationship to silica exposure: a 44-year cohort study of 34,018 workers. Am J Epidemiol 178:14241433
Mohamad ET, Noor MM, Saad R (2010) Potential effects of quarry operations on workforce safety. In: Goh E, Lazim AT, Lin CN, Lip MM, Fat LK, Devi N (eds) Quarries and quarrying: sustainable development, green technology and best practices. Institute of Quarrying Malaysia, Selangor
NIOSH, 1998. Particulate not otherwise regulated, respirable. Method 0600, National Institute on Occupational Safety and Health. Manual of analytical method (NMAM). link: http://www.cdc.gov/niosh/docs/2003-154/pdfs/0600.pdf
NIOSH, 2003. National Institute on Occupational Safety and Health. Manual Analytical Method No 7500: Silica, Crystalline, by X-ray difractometer (XRD) via filter deposition. National Institute on Occupational Safety and Health. link: http://www.cdc.gov/niosh/docs/2003-154/pdfs/7500.pdf
The authors would like to thank National Institute of occupational Safety and Health (NIOSH) of Malaysia for providing research grant (06/NIOSH/03-06/NG 0018), laboratory facilities and manpower for this study. Also, thanks to Malaysian Ministry of Higher Education for Fundamental Research Grant (FRGS/1/2015/WAB03/UKM/01/1). Special thanks to Dr. Rose Norman for the assistance with the proofreading of this manuscript.
Laboratory Division, Consultation Research and Development Department, National Institute of Occupational Safety and Health (NIOSH), Lot 1, Jln 15/1, Section 15, 43650, Bandar Baru Bangi, Selangor, Malaysia
Amran, S., Latif, M.T., Khan, M.F. et al. Underestimation of respirable crystalline silica (RCS) compliance status among the granite crusher operators in Malaysian quarries. Air Qual Atmos Health 10, 371379 (2017). https://doi.org/10.1007/s11869-016-0439-7Get in Touch with Mechanic