Magnetic characterisation of London's airborne nanoparticulate matter
نویسندگان
چکیده
Iron-bearing particulate matter produced by vehicle emissions is known to be toxic. To better quantify potential health risks, we have conducted the first magnetic study of a time-series London's inhalable (<10 ?m, PM 10 ), captured three monitoring stations in central London (Marylebone Road, Earl's Court Road and Oxford Street) through 2010 2012. We room-temperature analysis on all samples, limited number samples were analysed at both high low temperatures. The high-temperature measurements identified magnetite as dominant phase. low-temperature revealed numbers nanoparticles, which, assuming magnetite, are grain-size range 1–4 nm. It estimated that much ?40% total signal K from particles <4 nm, magnetically ‘invisible’ being routinely under-estimated room temperature-based studies. From measurements, concentration was ?7.5%, significantly higher than previously reported. data compared with other pollution data, e.g., NO X , meteorological data. Mass-dependent terms like saturation magnetisation found display strong correlation indicating common source for these pollutants, i.e., emissions. Magnetic coercivity which independent abundance, provide information grain-size, consistent across sampling localities, again suggesting major source. Relatively small variations correlated events, temperature precipitation, preferential removal larger airborne grains, >50 • shows between mineralogy abundance. Magnetite primary mineral . As 40% nm size. Previous studies underestimated abundance nanoparticles.
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ژورنال
عنوان ژورنال: Atmospheric Environment
سال: 2022
ISSN: ['1352-2310', '1873-2844']
DOI: https://doi.org/10.1016/j.atmosenv.2022.119292