1974
DOI: 10.1021/es60098a006 View full text |Buy / Rent full text
|
|

Abstract: one type apparently arises when the air in the city becomes stagnant, while another type is clearly associated with unusually large industrial emissions. The Pb/Br ratio is not a practical tool for measuring the relative amounts of pollution from industrial and automotive sources-at least in an area with no strong industrial sources of Pb. AcknowledgmentThe authors would like to acknowledge the assistance of D. Yesso in preparing standard solutions, and of W. Strang of the Allegheny County Air Pollution Bureau… Show more

Help me understand this report

Search citation statements

Order By: Relevance
Select...
1
1
1
0
8
0

Year Published

1976
1976
1979
1979

Publication Types

Select...
3

Relationship

0
3

Authors

Journals

0
8
0
Order By: Relevance
“…In most cases, PbBrCl was the only crystalline phase identified with all the interplanar d spacings being assigned, while in a few cases PbO was also detected at a very trace level. The finding of only PbBrCl, which had a consistent Br/Cl ratio of 1.0 as indicated by the diffraction pattern (14), must reflect the engine sampling conditions. The fuel used was commercial Texaco 3-star with a mole ratio of Pb:EDB:EDC of 1:0.5:1.…”
Section: Methodsmentioning
See 2 more Smart Citations
Create an account to read the remaining citation statements from this report. You will also get access to:
  • Search over 1.2b+ citation statments to see what is being said about any topic in the research literature
  • Advanced Search to find publications that support or contrast your research
  • Citation reports and visualizations to easily see what publications are saying about each other
  • Browser extension to see Smart Citations wherever you read research
  • Dashboards to evaluate and keep track of groups of publications
  • Alerts to stay on top of citations as they happen
  • Automated reference checks to make sure you are citing reliable research in your manuscripts
  • 14 day free preview of our premium features.

Trusted by researchers and organizations around the world

Over 130,000 students researchers, and industry experts at use scite

See what students are saying

rupbmjkragerfmgwileyiopcupepmcmbcthiemesagefrontiersapsiucrarxivemeralduhksmucshluniversity-of-gavle
“…In most cases, PbBrCl was the only crystalline phase identified with all the interplanar d spacings being assigned, while in a few cases PbO was also detected at a very trace level. The finding of only PbBrCl, which had a consistent Br/Cl ratio of 1.0 as indicated by the diffraction pattern (14), must reflect the engine sampling conditions. The fuel used was commercial Texaco 3-star with a mole ratio of Pb:EDB:EDC of 1:0.5:1.…”
Section: Methodsmentioning
“…The latter workers suggested that the halogen loss from the lead halide compounds emitted from the exhaust was due to simple acid-base reactions involving carbonate or hydroxide ions, rather than a photolytic process, but did not explain the source of these ions in the atmosphere. This mechanism was further investigated by Boyer and Laitinen (14), who examined the reaction of laboratory-pure lead halide aerosols with CO2 and H2O vapor and found that the lead halide was quite stable with respect to reaction with these species, both in the presence and absence of light of wavelength 300-400 nm. They exposed PbBrCl to 9% CO2 in moist air at 50 °C in the dark over a 72-h period and found only 0.4% halide loss during decomposition, with slight enhancement during illumination, concluding that the large halogen losses observed from automobile exhaust particulates could not be replicated in the absence of the automotive exhaust environment.…”
mentioning
See 1 more Smart Citation
“…It is known that many different lead compounds can be formed by the interaction of TEL, EDB, and EDC (5), of which lead bromochloride is the most abundant (6). The reaction products are strongly dependent on temperature and oxygen/fuel ratio.…”
Section: Discussionmentioning
“…Several other studies provide evidence to suggest that halogens may not be lost from exhausted lead salts. 25 Boyer and Laitinen 25 evaluated the stability of laboratory pure lead halide aerosols toward halogen loss by hydrolytic exchange with H 2 O, CO 2 , and ultraviolet light and concluded that halogens were not lost under their laboratory (non-automotive exhaust environment) conditions. Bomback et al 26 have observed that the lead salts PbSO 4 and Pb 3 (PO 4 ) 2 accumulate in catalytic converters and that deposits containing these salts may periodically break off and be exhausted.…”
Section: Chemistrymentioning