Monitoring Airborne Dust In An Italian Basalt
Quarry: Comparison Between Sampling Methods
Author(s)
G. Alfaro Degan, D. Lippiello & M. Pinzari
Abstract
A field study in a dark grey basalt quarry nearby Rome is presented. PM10
airborne concentration due to typical quarry operations was recorded during a
period of two months. The aim of the work is testing the suitability of the laser
light scattering method in measuring airborne dust concentration in such typical
environmental conditions like those from quarrying operations. To the scope,
two sampling campaigns were developed according with two different methods:
from one side a traditional gravimetric method (NIOSH 0600) based on an air
sampling pump connected with PVC filters through a 37 mm aluminum cyclone
was used to assess PM10 concentration. On the other hand, a light scatter
technology developed with a real time dust monitor was applied. This method,
which is based on a photo detector that measures laser light scattered by particles
in the sampled stream, allows us to assess airborne dust concentration through a
specific calibration generally carried out by comparing the time weighed average
photometer readings with field measures of a known dust test (A1 Arizona Road
Dust in this case). The step of assessing airborne dust concentration from a
sampled particle number is a critical passage, as concentration itself is strictly
connected to the physical and chemical characteristics of the sampled aerosol,
such as particle size distribution, density and refractive index that obviously vary
from pollutant to pollutant. So after a preliminary comparison of the sampled
sets of values, some further analysis was developed in order to test the accuracy
of the sampled values and the correlation factor was assessed. The R2 value
(0.706) showed a fairly good correlation between the two methods suggesting we
consider the optical method suitable to survey PM10 in the specific case. So
basalt airborne dust was taken into account and a field calibration was
developed. The results showed a fulfilling improvement of correlation factor
Keywords
PM10, respirable dust, real time dust monitor, gravimetric sampler, calibration
Related Book
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