Junge Relationships in Measurement Data for Cyclic Siloxanes in Air
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In: Chemosphere, Vol. 93, No. 5, 01.10.2013, p. 830-834.
Research output: Journal contributions › Journal articles › Research › peer-review
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TY - JOUR
T1 - Junge Relationships in Measurement Data for Cyclic Siloxanes in Air
AU - MacLeod, Matthew
AU - Kierkegaard, Amelie
AU - Genualdi, Susie
AU - Harner, Tom
AU - Scheringer, Martin
N1 - Funding Information: This research has received funding from the Swedish Research Council (VR B0392101).
PY - 2013/10/1
Y1 - 2013/10/1
N2 - In 1974, Junge postulated a relationship between variability of concentrations of gases in air at remote locations and their atmospheric residence time, and this Junge relationship has subsequently been observed empirically for a range of trace gases. Here, we analyze two previously-published datasets of concentrations of cyclic volatile methyl siloxanes (cVMS) in air and find Junge relationships in both. The first dataset is a time series of concentrations of decamethylcyclopentasiloxane (D5) measured between January and June, 2009 at a rural site in southern Sweden that shows a Junge relationship in the temporal variability of the measurements. The second dataset consists of measurements of hexamethylcyclotrisiloxane (D3), octamethylcyclotetrasiloxane (D4) and D5 made simultaneously at 12 sites in the Global Atmospheric Passive Sampling (GAPS) network that shows a Junge relationship in the spatial variability of the three cVMS congeners. We use the Junge relationship for the GAPS dataset to estimate atmospheric lifetimes of dodecamethylcyclohexasiloxane (D6), 8:2–fluorotelomer alcohol and trichlorinated biphenyls that are within a factor of 3 of estimates based on degradation rate constants for reaction with hydroxyl radical determined in laboratory studies.
AB - In 1974, Junge postulated a relationship between variability of concentrations of gases in air at remote locations and their atmospheric residence time, and this Junge relationship has subsequently been observed empirically for a range of trace gases. Here, we analyze two previously-published datasets of concentrations of cyclic volatile methyl siloxanes (cVMS) in air and find Junge relationships in both. The first dataset is a time series of concentrations of decamethylcyclopentasiloxane (D5) measured between January and June, 2009 at a rural site in southern Sweden that shows a Junge relationship in the temporal variability of the measurements. The second dataset consists of measurements of hexamethylcyclotrisiloxane (D3), octamethylcyclotetrasiloxane (D4) and D5 made simultaneously at 12 sites in the Global Atmospheric Passive Sampling (GAPS) network that shows a Junge relationship in the spatial variability of the three cVMS congeners. We use the Junge relationship for the GAPS dataset to estimate atmospheric lifetimes of dodecamethylcyclohexasiloxane (D6), 8:2–fluorotelomer alcohol and trichlorinated biphenyls that are within a factor of 3 of estimates based on degradation rate constants for reaction with hydroxyl radical determined in laboratory studies.
KW - Chemistry
KW - D3
KW - D4
KW - D5
KW - D6
KW - FTOh
KW - Lifetime
UR - http://www.scopus.com/inward/record.url?scp=84884417168&partnerID=8YFLogxK
UR - https://www.mendeley.com/catalogue/10d6d74a-11dd-3c18-9cc6-f9dd375714cb/
U2 - 10.1016/j.chemosphere.2012.10.055
DO - 10.1016/j.chemosphere.2012.10.055
M3 - Journal articles
C2 - 23177712
VL - 93
SP - 830
EP - 834
JO - Chemosphere
JF - Chemosphere
SN - 0045-6535
IS - 5
ER -