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Henry's law constants measurements of alachlor and dichlorvos between 283 and 298K
AbstractIn this work, a dynamic system based on the water/air equilibrium at the interface within the length of a microporous tube was used to determine experimentally the Henry's law constants (HLC) of two pesticides: alachlor and dichlorvos. The measurements were conducted over the range 283–298K. At 298K, HLC were found to be equal to HLC=(14±2)×103 and HLC=(4.0±0.6)×103 (in units of Matm−1) for alachlor and dichlorvos, respectively. The obtained data were use to derive the following Arrhenius expressions: HLC=(8.0±3.4)×10−10 exp((9200±1600)/T) for alachlor and HLC=(2.8±0.4)×10−13 exp((11100±1500)/T) for dichlorvos. At a cumulus temperature of 283K, the fraction of alachlor and dichlorvos in the atmospheric aqueous phase is about 45% and 22%, respectively. Assuming that annual rainfall rate is 1m/year, the wet deposition lifetimes were then estimated to be of the order of 2.8 days for alachlor and 5.6 days for dichlorvos. These latter are used to compare the relative importance of wet removal towards the lifetime in the gas phase.
Henry's law constants measurements of alachlor and dichlorvos between 283 and 298K
AbstractIn this work, a dynamic system based on the water/air equilibrium at the interface within the length of a microporous tube was used to determine experimentally the Henry's law constants (HLC) of two pesticides: alachlor and dichlorvos. The measurements were conducted over the range 283–298K. At 298K, HLC were found to be equal to HLC=(14±2)×103 and HLC=(4.0±0.6)×103 (in units of Matm−1) for alachlor and dichlorvos, respectively. The obtained data were use to derive the following Arrhenius expressions: HLC=(8.0±3.4)×10−10 exp((9200±1600)/T) for alachlor and HLC=(2.8±0.4)×10−13 exp((11100±1500)/T) for dichlorvos. At a cumulus temperature of 283K, the fraction of alachlor and dichlorvos in the atmospheric aqueous phase is about 45% and 22%, respectively. Assuming that annual rainfall rate is 1m/year, the wet deposition lifetimes were then estimated to be of the order of 2.8 days for alachlor and 5.6 days for dichlorvos. These latter are used to compare the relative importance of wet removal towards the lifetime in the gas phase.
Henry's law constants measurements of alachlor and dichlorvos between 283 and 298K
Gautier, Céline (Autor:in) / Le Calvé, Stéphane (Autor:in) / Mirabel, Philippe (Autor:in)
Atmospheric Environment ; 37 ; 2347-2353
17.02.2003
7 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
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