Bedoukian   RussellIPM   RussellIPM   Piezoelectric Micro-Sprayer


Home
Animal Taxa
Plant Taxa
Semiochemicals
Floral Compounds
Semiochemical Detail
Semiochemicals & Taxa
Synthesis
Control
Invasive spp.
References

Abstract

Guide

Alphascents
Pherobio
InsectScience
E-Econex
Counterpart-Semiochemicals
Print
Email to a Friend
Kindly Donate for The Pherobase

« Previous AbstractCritical review and interpretation of environmental data for volatile methylsiloxanes: partition properties    Next AbstractHerbivore associated elicitor-induced defences are highly specific among closely related Nicotiana species »

Environ Toxicol Chem


Title:"Evaluation of the three-phase equilibrium method for measuring temperature dependence of internally consistent partition coefficients (K(OW), K(OA), and K(AW)) for volatile methylsiloxanes and trimethylsilanol"
Author(s):Xu S; Kropscott B;
Address:"Health and Environmental Sciences, Dow Corning, Auburn, Michigan, USA"
Journal Title:Environ Toxicol Chem
Year:2014
Volume:20141031
Issue:12
Page Number:2702 - 2710
DOI: 10.1002/etc.2754
ISSN/ISBN:1552-8618 (Electronic) 0730-7268 (Print) 0730-7268 (Linking)
Abstract:"Partitioning equilibria and their temperature dependence of chemicals between different environmental media are important in determining the fate, transport, and distribution of contaminants. Unfortunately, internally consistent air/water (K(AW)), 1-octanol/air (K(OA)), and 1-octanol/water (K(OW)) partition coefficients, as well as information on their temperature dependence, are scarce for organosilicon compounds because of the reactivity of these compounds in water and octanol and their extreme partition coefficients. A newly published 3-phase equilibrium method was evaluated for simultaneous determination of the temperature dependence of (K(OW), K(OA), and K(AW)) of 5 volatile methylsiloxanes (VMS) and trimethylsilanol (TMS) in a temperature range from 4 degrees C to 35 degrees C. The measured partition coefficients at the different temperatures for any given compound, and the enthalpy and entropy changes for the corresponding partition processes, were all internally consistent, suggesting that the 3-phase equilibrium method is suitable for this type of measurement. Compared with common environmental contaminants reported in the literature, VMS have enthalpy and entropy relationships similar to those of alkanes for air/water partitioning and similar to those of polyfluorinated compounds for octanol/air partitioning, but more like those for benzoates and phenolic compounds for octanol/water partitioning. The temperature dependence of the partition coefficients of TMS is different from those of VMS and is more like that of alcohols, phenols, and sulfonamides"
Keywords:"1-Octanol/chemistry Air Chromatography, High Pressure Liquid Entropy Kinetics Siloxanes/*chemistry Temperature Trimethylsilyl Compounds/*chemistry Volatile Organic Compounds/*chemistry Water/chemistry Enthalpy and entropy changes Enthalpy and entropy comp;"
Notes:"MedlineXu, Shihe Kropscott, Bruce eng 2014/09/23 Environ Toxicol Chem. 2014 Dec; 33(12):2702-10. doi: 10.1002/etc.2754. Epub 2014 Oct 31"

 
Back to top
 
Citation: El-Sayed AM 2024. The Pherobase: Database of Pheromones and Semiochemicals. <http://www.pherobase.com>.
© 2003-2024 The Pherobase - Extensive Database of Pheromones and Semiochemicals. Ashraf M. El-Sayed.
Page created on 22-11-2024