Beiträge zur Adsorption von Chlorkohlenwasserstoffen an Polyäthylen II. Adsorption von 11 Chlorkohlenwasserstoff-Pestiziden aus der Gasphase

Steinwandter, H.; Schlüter, Helmut

doi:10.1016/0045-6535(77)90087-x

Cited by 3 publications

(2 citation statements)

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“…Sorption of propargyl bromide and 1,3-D was also rapid, with most sorption occurring within 15 min after spiking and was complete within 4 h. Sorption of MeBr on each film was slower than the other fumigants tested; sorption of MeBr took place over several hours and was complete within 24 h. These sorption reactions appear more rapid than some other previously reported reaction rates for pesticides sorbing to plastics. Steinwandter and Schlu ¨ter (14) reported that the time required for complete sorption of organochlorine pesticides to plastics was on the order of days; however, the pesticides were added as a liquid so that this indicates the time required for liquid/vapor/sorbed-phase equilibrium. The time required for sorption of pesticides from the aqueous phase to plastic films is variable: Sorption of fungicides to PE film has been reported to occur within the first few minutes of contact, with equilibrium concentrations attained after 4 h ( 16); slow sorption of organochlorine and organophosphorus pesticides to LDPE has been observed, with sorption times on the order of days rather than hours (15).…”

Section: Resultsmentioning

confidence: 99%

“…There is little information available concerning the sorption of organic pesticide vapors to plastics. Steinwandter and Schlu ¨ter (14) observed sorption of organochlorine pesticide vapors to polyethylene sheets which accounted for up to 100% of the pesticide mass added to the reaction vessel, so that the PE-sorbed concentrations ranged from 0.003 to 0.01 mg/m 2 . The sorption of pesticides and other organics in aqueous solution to plastics has been better characterized.…”

Section: Introductionmentioning

confidence: 99%

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Sorption of Fumigants to Agricultural Films

Papiernik

Gan

Knuteson

et al. 1999

Environ. Sci. Technol.

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Plastic tarps are often used in soil fumigation to contain chemicals in the soil to increase efficacy and decrease emissions of fumigant vapors. This research has shown that plastic films have a significant capacity to sorb fumigant vapors and that the sorption is largely reversible. We tested three agricultural films (polyethylene and two high-barrier films) with four soil fumigants (methyl bromide, chloropicrin, 1,3-dichloropropene, and propargyl bromide, a potential alternative to methyl bromide). We observed significant sorption of all fumigants to all the films at field-relevant concentrations. Partition coefficients (sorbed/vapor-phase concentration) ranged from <1 dm3/m2 film for methyl bromide to ∼200 dm3/m2 film for chloropicrin. Sorption isotherms were linear, indicating that the film may be a large sink for fumigant vapors. Sorption of most fumigants was very rapid, with the bulk of the sorption occurring within the first few minutes of contact. Desorption was also rapid, with most desorption occurring within minutes after the film samples were removed to fresh air. First-order rate constants for desorption were ∼0.5 to 1.5 min-1. Sorption/desorption may be important in reducing emissions and determining worker exposure and should be considered in measurements involving agricultural films.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%