Relationship Between the Evaporation Rate and Vapor Pressure of Moderately and Highly Volatile Chemicals

Wesenbeeck, Ian van; Driver, Jeffrey; Ross, John H.

doi:10.1007/s00128-008-9380-2

Cited by 34 publications

(28 citation statements)

References 10 publications

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“…2a). In this case, the dependency of the stimulus dynamics on vapor pressure likely reflects the linear relationship between evaporation rate (defined as minus the rate of change of the odor concentration in liquid phase) and vapor pressure, which has been experimentally observed (van Wesenbeeck et al, 2008), as well as deviations due to interactions between the paraffin oil and the odorant molecules in the liquid phase (Teixeira et al, 2009). …”

Section: Resultsmentioning

confidence: 97%

Intensity Invariant Dynamics and Odor-Specific Latencies in Olfactory Receptor Neuron Response

2013

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Odors elicit spatio-temporal patterns of activity in the brain. Spatial patterns arise from the specificity of the interaction between odorants and odorant receptors expressed in different olfactory receptor neurons (ORNs). But the origin of temporal patterns of activity and their role in odor coding remain unclear. We investigate how physiological aspects of ORN response and physical aspects of odor stimuli give rise to diverse responses in Drosophila ORNs. We show that odor stimuli have intrinsic dynamics that depend on odor type and strongly affect ORN response. Using linear-nonlinear modeling to remove the contribution of the stimulus dynamics from the ORN dynamics we study the physiological properties of the response to different odorants and concentrations. For several odorants and receptor types the ORN response dynamics normalized by the peak response are independent of stimulus intensity for a large portion of the neuron’s dynamic range. Adaptation to a background odor changes the gain and dynamic range of the response but does not affect normalized response dynamics. Stimulating ORNs with various odorants reveals significant odor-dependent delays in the ORN response functions. These differences however can be dominated by differences in stimulus dynamics. In one case the response of one ORN to two odorants is predicted solely from measurements of the odor signals. Within a large portion of their dynamic range ORNs can capture information about stimulus dynamics independently from intensity while introducing odor-dependent delays. How insects might use odor-specific stimulus dynamics and ORN dynamics in discrimination and navigation tasks remains an open question.

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Section: Resultsmentioning

confidence: 97%

Intensity Invariant Dynamics and Odor-Specific Latencies in Olfactory Receptor Neuron Response

2013

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“…The two solid compounds ( 4 and 5) showed the highest protection among the compounds tested. Since the latter two compounds had similar Log P values to DEET, this might reflect variation in melting point and thus vapour pressure, which affects the time until complete evaporation (35) …”

Section: Discussionmentioning

confidence: 99%

A bioassay for mosquito repellency against Aedes aegypti: method validation and bioactivities of DEET analogues

Jahn

Kim

Choi

et al. 2010

Journal of Pharmacy and Pharmacology

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“…A relation derived by van Wesenbeeck et al (2008) from a data set of 82 active substances and coformulants was used to confirm the plausibility of the vapor‐pressure bands for the transition from nonvolatile to volatile behavior, the corresponding F air values, and the 0.01 Pa cutoff for volatile substances:

Ln false(ER false) = 12.2 + 0.933 \times Ln false(VP false),

where ER is evaporation rate (µg/m 2 /h) and VP is vapor pressure (Pa). The pooled data set spanned a vapor pressure range of 0.0001 to >30 000 Pa, and was based on evaporation of pure substances and mixtures from plant, soil, and laboratory studies at ambient relative humidity (30%–50%).…”

Section: Methodsmentioning

confidence: 97%

REACH Specific Environmental Release Categories for Plant Protection Product Applications

Dobe

Bonifay²,

Krass

et al. 2020

Integr Envir Assess & Manag

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The European Registration, Evaluation, Authorisation and Restriction of Chemicals (REACH) regulation requires that quantitative environmental risk assessment is carried out for hazardous substances used as coformulants in plant protection products (PPPs), if registered above 10 t/y. The European Crop Protection Association (ECPA) has developed generic exposure scenarios and specific environmental release categories (SpERCs) to support these risk assessments. The SpERCs offer refinements to the default release factors defined in environmental release categories (ERCs) and are intended to be used with nested multimedia mass balance models as part of the assessment of regional predicted environmental concentrations. Based on the application method of PPPs, 2 scenarios were defined for which SpERCs were developed: 1) spraying of PPPs and 2) direct application of granular products or treated seeds to soil. The SpERC for spray applications includes release factors to air and soil that depend on the vapor pressure of the coformulant. Calculations are presented to support the subSpERCs describing the transition from nonvolatile to volatile behavior. The most recent version of the spray application SpERC defines a release factor for surface water and more conservative release factors to soil compared with previous versions. Use of the ECPA SpERCs allows the coformulant emissions from PPPs to be fully accounted for in the regional‐scale environmental risk assessment for a given substance, along with all other sources of emissions. Qualitative and quantitative justification for the ECPA‐derived SpERCs is presented and serves as the background documentation to the online European Chemicals Agency (ECHA) SpERC factsheets. The approach developed here whereby regional‐scale SpERCs are used in combination with a customized local‐scale exposure model is potentially applicable for other sectors that are required to conduct exposure assessments outside the scope of the standard environmental REACH models. Integr Environ Assess Manag 2020;16:472–480. © 2020 Syngenta Crop Protection AG. Integrated Environmental Assessment and Management published by Wiley Periodicals, Inc. on behalf of Society of Environmental Toxicology & Chemistry (SETAC)

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Relationship Between the Evaporation Rate and Vapor Pressure of Moderately and Highly Volatile Chemicals

Cited by 34 publications

References 10 publications

Intensity Invariant Dynamics and Odor-Specific Latencies in Olfactory Receptor Neuron Response

Intensity Invariant Dynamics and Odor-Specific Latencies in Olfactory Receptor Neuron Response

A bioassay for mosquito repellency against Aedes aegypti: method validation and bioactivities of DEET analogues

REACH Specific Environmental Release Categories for Plant Protection Product Applications

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