Contamination levels and source apportionment of potentially toxic elements in size-fractionated road dust of Moscow

Власов, Д.В.; Vasil’chuk, J. Yu.; Кошелева, Н. Е.; Касимов, Н.С.

doi:10.1007/s11356-022-24934-1

Cited by 9 publications

(1 citation statement)

References 110 publications

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“…It should be noted that in urban test sites, the largest share among polluting suspended particles is taken by small particles (PM 0.3 , PM 0.5, PM 1.0 , PM 2.5 ), while the concentrations of PM 5.0 and PM 10 particles are not high, and in the background test site there are no such particles at all. Other authors also report higher concentrations of small particles in polluted urban air (Linh et al 2023;Vlasov et al 2023).…”

Section: Resultsmentioning

confidence: 91%

Diversity and negative effect of PM0.3–10.0 adsorbed by needles of urban trees in Irkutsk, Russia

Mikhailova,

Shergina

2023

Environ Sci Pollut Res

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The study was performed in natural forests preserved within the Boreal zone city, Irkutsk, Russia. Test sites were selected in the forests in different districts of the city, where samples of Scots pine (Pinus sylvestris L.) and Siberian larch (Larix sibirica Ledeb.) needles were taken to study the adsorption on their surface of aerosol particles of different sizes, in microns: PM 0.3 , PM 0.5 , PM 1 , PM 2.5 , PM 5 , PM 10 . Scanning electron microscopy was used to obtain high-resolution photographs (magni cation 800-2000x, 16000x) and aerosol particles (Particulate Matter -PM) were shown to be intensively adsorbed by the surface of needles, with both size and shape of the particles characterized by a wide variety. Pine needles can be covered with particles of solid aerosol by 50-75%, stomata are often completely blocked. Larch needles often show areas, which are completely covered with aerosol particles, there are often found stomata deformed by the penetration of PMx. X-ray spectral microanalysis showed differences in the chemical composition of adsorbed PMx, the particles can be metallic if metals predominate in their composition, carbonaceous -in case of carbon predominance, or polyelemental, if the composition is complex and includes signi cant quantities of other elements besides metals and carbon (calcium, magnesium, potassium, sodium, sulfur, chlorine, uorine). Since the particles contain a large proportion of technogenic pollutants, accumulation by the needles of some widespread pollutants was investigated. A direct correlation of a highly signi cant level between the concentration of PMx in the air and the accumulation of many heavy metals in pine and larch needles, as well as sulfur, uorine, chlorine, has been revealed, which indicates a high cleaning capacity of urban forests. At the same time, the negative impact of PMx particles on the vital status of trees is great, which shows in intense disturbance of the parameters of photosynthesis and transpiration, leading to a signi cant decrease in the growth characteristics of trees and reduction in the photosynthetic volume of the crowns. We consider that the results obtained are instrumental in developing an approach to improvement of urban forests status and creating a comfortable urban environment for the population.

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Section: Resultsmentioning

confidence: 91%