Stone, Sand & Gravel REVIEW - September/October 2017 - 25

Figure 3. Screen shot of the software under development by NIOSH to be used by occupational health professionals for the field-based
silica monitoring approach.

addressed by the new monitoring
approach. Therefore, our research
is in progress to identify the different airborne minerals that are
common in aggregates operations,
and to determine how these minerals affect the accuracy of the silica
analysis. We can then create appropriate calibration strategies to correct for their presence.
With the help of NSSGA members,
we've used this approach over the
last two years to test the accuracy
of more than 500 dust samples, from
limestone, granite and sand and
gravel operations. We compared our
results with those produced by the
standard NIOSH 7500 analysis for
silica. Our results will be summarized in an upcoming peer-reviewed
publication. From the preliminary
analysis, it appears that some specific minerals may negatively affect
the silica quantification (see Figure
2). To correct for this confounding
effect, we must design a specific
calibration strategy.
In addition to being accurate and
accounting for the presence of other

minerals in the dust sample, we know
that the process must also be simple
and quick. We are currently modifying
the conventional sampling cassette
for quick insertion into the portable
analyzer - without opening the cassette first.
Finally, with a user-friendly
approach in mind, we are also developing software to assist with data
analysis and data management to
facilitate everyday use of the portable
infrared analyzer.
Next steps
To ensure its scientific integrity,
our monitoring approach requires
substantial testing in the field. We
must verify that the final technique
is as simple and as beneficial as possible for future users. The equations
used to quantify silica concentration must be challenged and optimized with even more dust samples
collected in aggregates operations.
The new technologies involved in the
monitoring approach, including the
modified sampling cassette and the
NIOSH-developed software, need to be

beta-tested and further refined based
on user comments.
Finally, feedback from occupational
professionals in the mining industry
- the intended users for the final technique - will be essential to ensuring
that this novel monitoring approach
provides accurate, accessible information that will ultimately better protect
miners from exposure to respirable
silica dust. Beta testing of the overall
monitoring approach is scheduled in
the next few months, and we look
forward to sharing the results.
Disclaimer
The findings and conclusions in
this article are those of the authors
and do not necessarily represent
the views of the National Institute
for Occupational Safety and Health
(NIOSH). Mention of any company or
product does not constitute endorsement by NIOSH.
For further information, please
contact NIOSH researchers Emanuele
Cauda, ecauda@cdc.gov, 412-386-4518
or Lauren Chubb, lchubb@cdc.gov,
412-386-6460. 
■

STONE, SAND & GRAVEL REVIEW, www.nssga.org  25


http://www.nssga.org

Table of Contents for the Digital Edition of Stone, Sand & Gravel REVIEW - September/October 2017

Aggregates News Blasts
Opposing WOTUS at Every Turn
Success Story: Highway Funding Package Passed in Indiana
The Future of Respirable Silica Monitoring
Tracking and Measuring Biodiversity
NSSGA@Work
Rip & Share
Equipment Guide
Index of Advertisers
Stone, Sand & Gravel REVIEW - September/October 2017 - Intro
Stone, Sand & Gravel REVIEW - September/October 2017 - cover1
Stone, Sand & Gravel REVIEW - September/October 2017 - cover2
Stone, Sand & Gravel REVIEW - September/October 2017 - 3
Stone, Sand & Gravel REVIEW - September/October 2017 - 4
Stone, Sand & Gravel REVIEW - September/October 2017 - 5
Stone, Sand & Gravel REVIEW - September/October 2017 - 6
Stone, Sand & Gravel REVIEW - September/October 2017 - 7
Stone, Sand & Gravel REVIEW - September/October 2017 - 8
Stone, Sand & Gravel REVIEW - September/October 2017 - 9
Stone, Sand & Gravel REVIEW - September/October 2017 - 10
Stone, Sand & Gravel REVIEW - September/October 2017 - Aggregates News Blasts
Stone, Sand & Gravel REVIEW - September/October 2017 - 12
Stone, Sand & Gravel REVIEW - September/October 2017 - 13
Stone, Sand & Gravel REVIEW - September/October 2017 - Opposing WOTUS at Every Turn
Stone, Sand & Gravel REVIEW - September/October 2017 - 15
Stone, Sand & Gravel REVIEW - September/October 2017 - 16
Stone, Sand & Gravel REVIEW - September/October 2017 - 17
Stone, Sand & Gravel REVIEW - September/October 2017 - 18
Stone, Sand & Gravel REVIEW - September/October 2017 - Success Story: Highway Funding Package Passed in Indiana
Stone, Sand & Gravel REVIEW - September/October 2017 - The Future of Respirable Silica Monitoring
Stone, Sand & Gravel REVIEW - September/October 2017 - 21
Stone, Sand & Gravel REVIEW - September/October 2017 - 22
Stone, Sand & Gravel REVIEW - September/October 2017 - 23
Stone, Sand & Gravel REVIEW - September/October 2017 - 24
Stone, Sand & Gravel REVIEW - September/October 2017 - Tracking and Measuring Biodiversity
Stone, Sand & Gravel REVIEW - September/October 2017 - 26
Stone, Sand & Gravel REVIEW - September/October 2017 - 27
Stone, Sand & Gravel REVIEW - September/October 2017 - 28
Stone, Sand & Gravel REVIEW - September/October 2017 - 29
Stone, Sand & Gravel REVIEW - September/October 2017 - 30
Stone, Sand & Gravel REVIEW - September/October 2017 - NSSGA@Work
Stone, Sand & Gravel REVIEW - September/October 2017 - 32
Stone, Sand & Gravel REVIEW - September/October 2017 - Rip & Share
Stone, Sand & Gravel REVIEW - September/October 2017 - 34
Stone, Sand & Gravel REVIEW - September/October 2017 - Equipment Guide
Stone, Sand & Gravel REVIEW - September/October 2017 - 36
Stone, Sand & Gravel REVIEW - September/October 2017 - 37
Stone, Sand & Gravel REVIEW - September/October 2017 - 38
Stone, Sand & Gravel REVIEW - September/October 2017 - 39
Stone, Sand & Gravel REVIEW - September/October 2017 - 40
Stone, Sand & Gravel REVIEW - September/October 2017 - Index of Advertisers
Stone, Sand & Gravel REVIEW - September/October 2017 - 42
Stone, Sand & Gravel REVIEW - September/October 2017 - 43
Stone, Sand & Gravel REVIEW - September/October 2017 - 44
Stone, Sand & Gravel REVIEW - September/October 2017 - cover3
Stone, Sand & Gravel REVIEW - September/October 2017 - cover4
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