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Heterogeneity of platinum group metals in airborne particles

Sebastien Rauch (Institutionen för Vatten Miljö Transport, Vattenprocessteknik) ; Ming Lu ; Greg Morrison (Institutionen för Vatten Miljö Transport, Vattenprocessteknik)
Environmental Science & Technology Vol. 35 (2001), p. 595-599.
[Artikel, refereegranskad vetenskaplig]

The emission of three of the platinum group metals (PGMs), Pd, Pt, and Rh, from automobile catalysts and into the urban environment is a potential concern for human health. The analysis of low concentrations of PGMs in air particles is an analytical challenge, and it is demonstrated that interferences in inductively coupled plasma-mass spectrometry (ICP-MS) can be corrected mathematically for Pt and Rh and, at higher concentrations, for Pd. The PM10 concentrations of PGMs in urban air collected in Göteborg are 0.1-10 pg m-3 (Pd), 0.9-19 pg m-3 (Pt), and 0.3-4 pg m-3 (Rh), with higher values for greater traffic intensity. These concentrations provide a general background for the urban atmospheric environment, and the Pt:Rh ratio (4.2:1) agrees with known automobile catalyst composition. The analysis of filters from 10 parallel samplers indicated the significant heterogeneity of PGMs in samples of urban air particles. Scanning laser ablation ICP-MS provided the m spatial resolution required to identify individual particles. Ablation across the filter surface demonstrated the presence of relatively few particles with a high concentration of PGMs. These occasional high concentration particles, which might be overlooked in conventional air sampling with total analysis, have a high Pt:Rh ratio (12.3:1), which can be attributed to catalyst aging during vehicle operation.

Nyckelord: Platinum group elements, atmospheric pollution, automobile emission



Denna post skapades 2006-09-28.
CPL Pubid: 2292

 

Institutioner (Chalmers)

Institutionen för Vatten Miljö Transport, Vattenprocessteknik (2000-2004)

Ämnesområden

Miljöteknik

Chalmers infrastruktur