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Atkinson, Roger; Guicherit, R.; Hites, Ronald A.; Palm, Wolf-Ulrich; Seiber, James N.; Voogt, P. de

doi:10.1023/a:1005286313693

Cited by 97 publications

(17 citation statements)

References 90 publications

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“…Studies of oxidation chemistry require such rapid measurement as atmospheric lifetimes of pesticides can be short due to reaction with OH radicals. Atkinson et al (1999) reported rapid trifluralin reaction with the OH radical (> 1 × 10 −10 cm 3 molecules −1 s −1 ) and photolysis rates on the order of minutes, while the halflife for atrazine plus OH is 2.6 h for a global average radical concentration of 1 × 10 6 molecules cm −3 . As an example of the need for rapid detection for indoor exposure estimates, Vesin et al showed that pesticides must be measured rapidly (< 1 h) due to high emission variation from electronic vaporizers (Vesin et al, 2013).…”

Section: T Murschell Et Al: Gas-phase Pesticide Measurementmentioning

confidence: 99%

Gas-phase pesticide measurement using iodide ionization time-of-flight mass spectrometry

2017

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Abstract. Volatilization and subsequent processing in the atmosphere are an important environmental pathway for the transport and chemical fate of pesticides. However, these processes remain a particularly poorly understood component of pesticide lifecycles due to analytical challenges in measuring pesticides in the atmosphere. Most pesticide measurements require long (hours to days) sampling times coupled with offline analysis, inhibiting observation of meteorologically driven events or investigation of rapid oxidation chemistry. Here, we present chemical ionization time-of-flight mass spectrometry with iodide reagent ions as a fast and sensitive measurement of four current-use pesticides. These semivolatile pesticides were calibrated with injections of solutions onto a filter and subsequently volatilized to generate gas-phase analytes. Trifluralin and atrazine are detected as iodide-molecule adducts, while permethrin and metolachlor are detected as adducts between iodide and fragments of the parent analyte molecule. Limits of detection (1 s) are 0.37, 0.67, 0.56, and 1.1 µg m −3 for gas-phase trifluralin, metolachlor, atrazine, and permethrin, respectively. The sensitivities of trifluralin and metolachlor depend on relative humidity, changing as much as 70 and 59, respectively, as relative humidity of the sample air varies from 0 to 80 %. This measurement approach is thus appropriate for laboratory experiments and potentially near-source field measurements.

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Section: T Murschell Et Al: Gas-phase Pesticide Measurementmentioning

confidence: 99%

Gas-phase pesticide measurement using iodide ionization time-of-flight mass spectrometry

2017

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“…The wall effects can partly be overcome by (1) raising the reaction temperature, (2) employing Teflon‐coated chambers, and (3) selecting an OH radicals generating method that is less sensitive to the wall surface 9. However, due to technical difficulties, up to now only a limited number of SOCs have been studied for their reactions with OH radicals 7,9–12. In these studies, researchers either selected organic compounds with relatively high vapor pressures or raised the temperature to minimize the wall effect.…”

Section: Introductionmentioning

confidence: 99%

Gas‐phase reaction of dichlorvos, carbaryl, chlordimeform, and 2,4‐D butyl ester with OH radicals

Sun

Zhu

Shang

et al. 2005

Int J of Chemical Kinetics

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Widespread use of pesticides has caused serious environmental concern. In order to evaluate the fate of organic pesticides in the atmosphere, rate constants for gas phase reactions of OH radicals with dichlorvos, carbaryl, chlordimeform, and 2,4-D butyl ester were measured using the relative rate method at ambient temperature and 101 kPa total pressure. On-line FTIR spectroscopy was used to monitor the concentrations of pesticides as a function of time. The reaction rate constants with OH radicals (in units of cm 3 molecule −1 s −1 ) have been determined as (2.0 ± 0.4) × 10 −11 for dichlorvos, (3.3 ± 0.5) × 10 −11 for carbaryl, (3.0 ± 0.7) × 10 −10 for chlordimeform, and (1.5 ± 0.2) × 10 −11 for 2,4-D butyl ester. These rate constants agree well with those estimated based on the structure-activity relationship. The group rate constant for N C group (k (N C) ) was estimated as 2.7 × 10 −10 cm 3 molecule −1 s −1 . Dimethyl phosphite has been tentatively identified as a product of the reaction of dichlorvos with OH radicals. Atmospheric lifetimes due to the reactions with OH radicals were also estimated (in units of h): 14 ± 3 for dichlorvos, 8 ± 1 for carbaryl, 1.0 ± 0.3 for chlordimeform, and 19 ± 3 for 2,4-D butyl ester. These short atmospheric lifetimes indicate that the four organic pesticides degrade rapidly in the atmosphere, and they themselves are unlikely to cause persistent pollution. Further studies are needed to identify the potential hazard of their degradation products. C 2005 Wiley Periodicals, Inc. Int J Chem Kinet 37: [755][756][757][758][759][760][761][762] 2005

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“…In this model both adsorption and absorption mechanisms are in effect (Pankow, 1994). The model is given in equation (2).…”

Section: Gas/particle Partitioningmentioning

confidence: 99%

İstanbul’da Kiş Hava Şartlarinda Atmosferi̇k Organoklorlu Pesti̇si̇t Sevi̇yeleri̇ Ve Gaz/Parti̇kül Dağilimlari

Kuzu

2018

Uludağ University Journal of the Faculty of Engineering

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In this study, gas and particle phase ambient organochlorine pesticide (OCP) levels were investigated atan urban site in Istanbul. Samples were collected by a high-volume sampler for fourteen days in winter. Individual OCP concentrations were between13 and 593 pg.m-3 for particle phase and 14 and 1,748 pg.m-3 for gaseous phase. The sums of the average concentration of each OCP in gaseous and particle phases were 3,219 and 2,746 pg.m-3 , respectively. δ-HCH had the highest individual concentration. The abundance of DDTs followed the order 4.4'-DDT > 4.4'-DDD > 4.4'-DDE.The Σ(gas+particle)OCP concentrations ranged between 1,845 and 10,196 pg.m-3. On the days when high concentrations were observed, the trajectories of air masses were investigated by the HYSPLIT model. logKp versus logP L 0 model was applied in order to determine the fate of gas/particle partitioning. The average slope of the regression line was-0.35, whereas the intercept was-2.89.

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Cited by 97 publications

References 90 publications

Gas-phase pesticide measurement using iodide ionization time-of-flight mass spectrometry

Gas-phase pesticide measurement using iodide ionization time-of-flight mass spectrometry

Gas‐phase reaction of dichlorvos, carbaryl, chlordimeform, and 2,4‐D butyl ester with OH radicals

İstanbul’da Kiş Hava Şartlarinda Atmosferi̇k Organoklorlu Pesti̇si̇t Sevi̇yeleri̇ Ve Gaz/Parti̇kül Dağilimlari

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