1. A new optical-based technique for real-time measurements of mineral dust concentration in PM10 using a virtual impactorLuka Drinovec, Jean Sciare, IASONAS STAVROULAS, S. Bezantakos, MICHAEL PIKRIDAS, FLORIN UNGA, Chrysanthos Savvides, Bojana Višnjić, Maja Remškar, Griša Močnik, 2020, original scientific article Abstract: Atmospheric mineral dust influences Earth’s radiative
budget, cloud formation, and lifetime; has adverse
health effects; and affects air quality through the increase of
regulatory PM10 concentrations, making its real-time quantification
in the atmosphere of strategic importance. Only
few near-real-time techniques can discriminate dust aerosol
in PM10 samples and they are based on the dust chemical
composition. The online determination of mineral dust using
aerosol absorption photometers offers an interesting and
competitive alternative but remains a difficult task to achieve.
This is particularly challenging when dust is mixed with
black carbon, which features a much higher mass absorption
cross section. We build on previous work using filter photometers
and present here for the first time a highly timeresolved
online technique for quantification of mineral dust
concentration by coupling a high-flow virtual impactor (VI)
sampler that concentrates coarse particles with an aerosol absorption
photometer (Aethalometer, model AE33). The absorption
of concentrated dust particles is obtained by subtracting
the absorption of the submicron (PM1) aerosol fraction
from the absorption of the virtual impactor sample (VIPM1
method). This real-time method for detecting desert
dust was tested in the field for a period of 2 months (April and
May 2016) at a regional background site of Cyprus, in the
Eastern Mediterranean. Several intense desert mineral dust
events were observed during the field campaign with dust
concentration in PM10 up to 45 μgm
Found in: osebi
Keywords: aerosol absorption, mineral dust, on-line detection, air quality
Published: 20.07.2020; Views: 1949; Downloads: 0
 Fulltext (2,38 MB) |
2. Detection of mineral dust concentration in Mediterranean and Central Europe by measuring optical absorption of dust particlesIrena Ježek, Matic Ivančič, Martin Rigler, Asta Gregorič, Balint Alfoldy, Luka Drinovec, JEAN SCIARE, MICHAEL PIKRIDAS, FLORIN UNGA, Andres Alastuey, Marco Pandolfi, Jesus Yus Diez, Griša Močnik, 2020, unpublished conference contribution Found in: osebi
Keywords: mineral dust, optical absorption, virtual impactor
Published: 22.11.2021; Views: 1083; Downloads: 0
Fulltext (4,15 MB) |
3. A METHOD FOR QUANTIFICATION OF MINERAL DUST IN AIR BASED ON OPTICAL ABSORPTION OF PARTICLES CONCENTRATED BY A VIRTUAL IMPACTOR AND A DEVICE PERFORMING THE SAID METHODJEAN SCIARE, FLORIN UNGA, MICHAEL PIKRIDAS, SPIROS BEZANTAKOS, IASONAS STAVROULAS, Griša Močnik, Luka Drinovec, patent Abstract: The present invention belongs to the field of devices and methods for measurement of particle concentration, more precisely to the field of devices and methods for quantification of particles based ontheir physical characteristics, especially with the use of optical means. The invention relates to a method for determination of ambient mineral dust concentration based on optical absorption of particles concentrated by a virtual impactor as well as a device performing the said method. The method comprises the following steps: sampling air samples with particle size smaller than 1 mum (PM1) andsampling air samples with particle size up to 10 mum; concentrating the samples with particle sizes up to 10 mum with a virtual impactor; measuring optical absorption of collected samples at least onewavelength from UV to IR spectre, preferably from 370 to 950 nm, most preferably at 370 nm; subtracting the absorption of the samples with particle size smaller than 1 mum from the absorption of thesample concentrated by the virtual impactor.
Found in: osebi
Keywords: dust, black carbon, aerosol
Published: 07.03.2023; Views: 269; Downloads: 0
Fulltext (426,73 KB) |
