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- W2942445327 abstract "A system, based on annular gold-coated denuders, was optimizedand used in the atmospheric sampling of mercury in urban and rural sites ofthe Alta Floresta, a region in the Brazilian Amazon. Results showed that vapourphase mercury (Hgv) is dominant in samples collectedin both sites. However, particulate mercury (Hg) may sometimes besignificant at the urban site, with values representing up to 77% ofthe total Hg collected during sampling, but may also be insignificant at thesame site, depending on the gold commercialization activity and, probably,on the meteorological conditions during the sampling period. The presenceof mercury in both the vapour and particulate phases in the atmosphere ofthe urban site can explain the high mercury concentrations found in urbandust reported for some cities in the Amazon, and also the relatively highHg concentrations found in soils adjacent to the urban centre of Alta Floresta.It appears that the urban dust of “garimpo” areas in the Amazoncan act as an efficient adsorber of Hgv emitted by gold dealeroperations during the purification process. Mercury emissions from gold dealershops in the Amazon have been considered as a human health risk through theinhalation of Hg vapour. However, although true for indoor sites, the significantcontribution of particulate phase Hg shown in this study in outdoor urbansites calls for a re-evaluation of the risk assessment estimates performedup to now in urban centres in the Amazon." @default.
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- W2942445327 date "2000-01-01" @default.
- W2942445327 modified "2023-09-23" @default.
- W2942445327 title "Sampling techniques for the assessment of anthropogenic vapour and particulate mercury in the Brazilian Amazon atmosphere" @default.
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