E-viri
Recenzirano
Odprti dostop
-
Zota, Ami R.; Willis, Robert; Jim, Rebecca; Norris, Gary A.; Shine, James P.; Duvall, Rachelle M.; Schaider, Laurel A.; Spengler, John D.
Journal of the Air & Waste Management Association, 11/2009, Letnik: 59, Številka: 11Journal Article
Atmospheric dispersion of particles from mine waste is potentially an important route of human exposure to metals in communities close to active and abandoned mining areas. This study assessed sources of mass and metal concentrations in two size fractions of respirable particles using positive matrix factorization (U.S. Environmental Protection Agency EPA PMF 3.0). Weekly integrated samples of particulate matter (PM) 10 µm in aerodynamic diameter or less (PM 10 ) and fine PM (PM 2.5 , or PM <2.5 µm in aerodynamic diameter) were collected at three monitoring sites, varying distances (0.5-20 km) from mine waste piles, for 58 consecutive weeks in a former lead (Pb) and zinc (Zn) mining region. Mean mass concentrations varied significantly across sites for coarse PM (PM 10 -PM 2.5 ) but not PM 2.5 particles. Concentrations of Pb and Zn significantly decreased with increasing distance from the mine waste piles in PM 10 -PM 2.5 (P < 0.0001) and PM 2.5 (P < 0.0005) fractions. Source apportionment analyses deduced five sources contributing to PM 2.5 (mobile source combustion, secondary sulfates, mine waste, crustal/soil, and a source rich in calcium Ca) and three sources for the coarse fraction (mine waste, crustal/soil, and a Ca-rich source). In the PM 2.5 fraction, mine waste contributed 1-6% of the overall mass, 40% of Pb, and 63% of Zn. Mine waste impacts were more apparent in the PM 10 -PM 2.5 fraction and contributed 4-39% of total mass, 88% of Pb, and 97% of Zn. Percent contribution of mine waste varied significantly across sites (P < 0.0001) for both size fractions, with highest contributions in the site closest to the mine waste piles. Seasonality, wind direction, and concentrations of the Ca-rich source were also associated with levels of ambient aerosols from the mine waste source. Scanning electron microscopy results indicated that the PMF-identified mine waste source is mainly composed of Zn-Pb agglomerates on crustal particles in the PM 10 -PM 2.5 fraction. In conclusion, the differential impacts of mine waste on respirable particles by size fraction and location should be considered in future exposure evaluations.
![loading ... loading ...](themes/default/img/ajax-loading.gif)
Vnos na polico
Trajna povezava
- URL:
Faktor vpliva
Dostop do baze podatkov JCR je dovoljen samo uporabnikom iz Slovenije. Vaš trenutni IP-naslov ni na seznamu dovoljenih za dostop, zato je potrebna avtentikacija z ustreznim računom AAI.
Leto | Faktor vpliva | Izdaja | Kategorija | Razvrstitev | ||||
---|---|---|---|---|---|---|---|---|
JCR | SNIP | JCR | SNIP | JCR | SNIP | JCR | SNIP |
Baze podatkov, v katerih je revija indeksirana
Ime baze podatkov | Področje | Leto |
---|
Povezave do osebnih bibliografij avtorjev | Povezave do podatkov o raziskovalcih v sistemu SICRIS |
---|
Vir: Osebne bibliografije
in: SICRIS
To gradivo vam je dostopno v celotnem besedilu. Če kljub temu želite naročiti gradivo, kliknite gumb Nadaljuj.