DDT in forest trees and lumber

Yule, W. N.; Hildebrand, M. J.; Smith, Gill; Fox, R. S.

doi:10.1007/bf01684499

Cited by 1 publication

(1 citation statement)

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“…Previous research concerning orchards suggests that vaporization from soil or other surfaces is only one loss mechanism of DDT‐group compounds. Other losses include leaching through soil or erosion, loss by vaporization and then to lipids such as in tree bark or into fruits that are later harvested [ Forsyth et al , 1983; Harris et al , 2000; Nash and Beall , 1970; Yule et al , 1972]. Some DDT‐group compounds can be lost by vaporization from organic carbon or other lipids: Results from Harner and Mackay [1995] show that the octanol‐air partition coefficient ( K oa ) for p , p ′‐DDT declines with higher air temperatures, suggesting that some loses are experienced from organic matter (with absorption properties similar to octanol) during warmer weather.…”

Section: Experimental Methodsmentioning

confidence: 99%

Spatial and temporal trends of gas and particle phase atmospheric DDT and metabolites in Michigan: Evidence of long‐term persistence and atmospheric emission in a high‐DDT‐use fruit orchard

et al. 2007

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[1] Michigan was among the top three apple producing states in the United States from the 1940s to 1969 when DDT was heavily used on its fruit orchards. More than 2 decades after Michigan banned DDT use in 1969, we collected air samples from four sites around the state to measure concentrations of six DDT-related compounds in the atmosphere. At South Haven, an apple producing area, average gas phase concentrations of DDT and DDE compounds were at least 10 times greater than the other sites including Pellston in the north, Deckerville in the east, and Dexter in south-central. Concentrations at South Haven showed a very strong seasonal cycle, an effect of higher air temperatures on moving these residues into the gas phase from a local source. We calculated DH values for all six compounds from the South Haven data which showed that p,p 0 -DDE was the highest at 108 kJ mol À1 . The DH values for all compounds at South Haven had a high correlation with Henry's Law Constant (HLC) (r = 0.7), verifying that HLC is a good indicator of tendency for compound conversion to the gas phase. South Haven was the only site with significant atmospheric particle-associated DDT. Particle/gas ratios there for p,p 0 -DDT and p,p 0 -DDE also had a predictable seasonal variation. Overall, these results show that agricultural sites with similar DDT use history will be continuous sources of atmospheric DDT for decades after application.

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