The
workers using DustBubble exposed to low level of respirable dust,
which meant the use of DustBubble could reduce the respirable
concentrations by 63% (GM: from 0.27 mg/m3 to 0.10 mg/m3; estimated
reduction = (1 0.09/0.29) 100% = 63%).
For respirable quartz dust, the estimated reduction of respirable
quartz by DustBubble is 43% ((1 0.04/0.07) 100%). However, the
results of statistical comparison indicated that there were no significant
differences between the exposure levels to total respirable
quartz dust (p = 0.144 > 0.05), which suggested that the use of Dust-
Bubble could not significantly reduce the quartz exposure level of
workers when drilling concrete. Moreover, both the GM of quartz
concentration values of two groups (0.07 mg/m3 and 0.04 mg/m3
respectively) were over or close to the exposure limit, which suggested
the concrete drilling process can generate high level of
quartz dust and DustBubble is inadequate to protect workers. Other
dust control measures (e.g. wet methods, and LEV) should be taken
to reduce the quartz exposure level to below the limit. The workers
should also wear appropriate respirators.
Theworkers using DustBubble exposed to low level of respirable dust,which meant the use of DustBubble could reduce the respirableconcentrations by 63% (GM: from 0.27 mg/m3 to 0.10 mg/m3; estimatedreduction = (1 0.09/0.29) 100% = 63%).For respirable quartz dust, the estimated reduction of respirablequartz by DustBubble is 43% ((1 0.04/0.07) 100%). However, theresults of statistical comparison indicated that there were no significantdifferences between the exposure levels to total respirablequartz dust (p = 0.144 > 0.05), which suggested that the use of Dust-Bubble could not significantly reduce the quartz exposure level ofworkers when drilling concrete. Moreover, both the GM of quartzconcentration values of two groups (0.07 mg/m3 and 0.04 mg/m3respectively) were over or close to the exposure limit, which suggestedthe concrete drilling process can generate high level ofquartz dust and DustBubble is inadequate to protect workers. Otherdust control measures (e.g. wet methods, and LEV) should be takento reduce the quartz exposure level to below the limit. The workersshould also wear appropriate respirators.
การแปล กรุณารอสักครู่..
