omics group 3 rd international conference and exhibition ohs valencia spain 24 june 2014
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OMICS GROUP 3 rd International Conference and Exhibition OHS Valencia Spain 24 June 2014. An assessment of exposure to respirable crystalline silica and the impact upon lung function among Quarry workers in Queensland, Australia? Kevin Hedges, BSc ,. DipEd ,. MAppSc ,. CIH, COH - PowerPoint PPT PresentationTRANSCRIPT
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OMICS GROUP 3rd International Conference and Exhibition OHS Valencia
Spain24 June 2014
An assessment of exposure to respirable crystalline silica and the impact upon lung
function among Quarry workers in Queensland, Australia?
Kevin Hedges, BSc,. DipEd,. MAppSc,. CIH, COH University of Western Sydney
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What is the risk?
15 years exposure to RCS in mg/m3
Predicted risks of developing silicosis within 15 years
following exposure
0.02 0.25%
0.04 0.5%
0.1 2.5%
0.3 20%
Study in Scottish coal miners.
Study in Scottish Coal Miners Source: HSE EH75/4 2002 p. 73.
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According to this study:15 years exposure at 0.1mg/m3
followed by 15 years of non exposure,equals:
1 in 40 chance of being diagnosed with silicosis
(ILO Category 2/1)
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“The quality of the exposure data for this study is more detailed and better documented compared to other studies”
HSE 2002 EH75/4 p.67
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Chronic obstructive pulmonary disease (COPD)
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Potency matrix
Factors Comment Situations
Particle size Enhances potency Grinding and abrasive process.
Dry and freshly cut Reference point to compare potency
Drilling, crushing.
Wetting From dust suppression
Wet extraction processes
Aged Reduces potency No abrasion, grinding.
Presence of clay Aluminium reduces potency
Mines extracting low rank coal
Adapted from HSE EH 75/4 page 7
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Intensity of exposure.
Freshly cut crystalline silica has a higher degree of potency to crystalline silica that has aged.
This may mean that if you breath in a relatively high concentration for a short duration of time this may be more hazardous than breathing in a lower concentration over a longer period of time.
Even though the average exposure over a day is the same!
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What about long periods of low exposure with short periods of high exposure?
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IOM Research Report TM/01/03 February 2001
0.1 mg m-3
Low + high
IOM Research Report TM/01/03 February 2001
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Smoking?
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IOM Research Report TM/01/03 February 2001
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What about morphology?
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Source: Champion et al,.2005 p. 4931
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What about particle size?
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(Plumlee and Ziegler, 2006).
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A recent development discussed in ISO 13138 (2012), is that the conventional design
of a cyclone is based on particle penetration and does not incorporate deposition.
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An assessment of exposure to respirable crystalline silica and
the impact on lung function among quarry workers in
QueenslandHedges, K., Reed, S., (2013), What parameters adversely impact lungfunction of workers exposed to Respirable Crystalline Silica?, J Health & Safety Research & Practice
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Data supplied by Geoscience Australia
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Mines Quarries
Granite Flint Slate Sand Clays Gravel
Sandstone Shale
Glass making Ceramics Potteries
Steel/Iron foundries Bricks Tiles
Construction-stone/concrete/plaster
Silica flour; paints, filtration, specialist products
Approximately 33,000 employees in Queensland Mining
Occupational Exposure to Respirable Crystalline Silica
HSE
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The aim of this study was to reassess previous exposures in
conjunction with more recent monitoring data and lung
function testing.
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Queensland the Smart State
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Health Surveillance
Use of an appropriate doctor?
0
10
20
30
40
50
60
Health Surveillance (Yes)
Health Surveillance (No)
Health Surveillance (Don't Know)
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Report provided back to the metal mining and quarrying industry in response to a questionnaire sent in March 2008
77
22
14
0%
10%
20%
30%
40%
50%
60%
70%
80%
90%
100%
% reply
Operations responded
Exploration
Mine
Quarry
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To better understand the correlation between RCS exposure and loss of lung
around 0.1 mg/m3 which is the Safe Work Australia 8-hr
exposure standard.
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Source: AS 2985 – 2009, p.6
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AS 2985-2009, p.6
Particle Aerodynamic Diameter (µm)
Respirable Dust Fraction (ISO7708)
(%)
0 100
1 100
2 97
3 80
4 56
5 34
6 20
7 11
8 6
10 2
12 0.5
14 0.2
16 0.1
18 0
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Graphical distribution of particles
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As the sampling and analysis using a cyclone is mass based and the median cut is 4.25 µm, sampling the larger particles may not provide an accurate estimate of risk where particles less that 2 µm are considered to be much more hazardous.
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PM2.5 may provide a better indication of the risk when attempting to identify a dose response relationship.
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Queensland the Smart State
Loader Op-erator - San-stone Quarry
Excavator Operator - Sandstone
Quarry
Excavator Saw Opera-tor - Sand-
stone Quarry
Saw Opera-tor - Sand-
stone Quarry
Stonemason - Sandstone
Quarry
0
0.05
0.1
0.15
0.2
0.25
0.3
0.35
Sandstone Quarry
Respirable quartz
mg
/m3
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Health effects
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FEV1 (Forced Expired Volume in 1 Second) measured in
Litres, which is the volume of air exhaled in the 1st second.
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Degree of severity FEV1 % of predicted
Mild > 70#
Moderate 60 - 69
Moderately severe 50 - 59
Severe 35 - 49
Very severe < 35
(From Pellegrino et al, 2005, p.957)
7 of the 45 (16%) of workers - moderate severity
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A correlation between loss of lung function even at exposures near or at the current exposure standard for RCS.
The results of this study show the importance of the use of lung function measurement (spirometry).
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Morphology?
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Electron microscopy by Microanalysis Australia (2 of 9 filters showed fibre-type morphology)
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Taking care of our future
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Or are we?