کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1170542 | 960683 | 2007 | 4 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Determination of Henry's law constants for low volatile mixed halogenated anisoles using solid-phase microextraction Determination of Henry's law constants for low volatile mixed halogenated anisoles using solid-phase microextraction](/preview/png/1170542.png)
Trihalogenated anisoles (THAs) that have been identified at low concentration levels (ng L−1) in drinking water are suspected of causing odor episodes, which are a frequent source of complaint by consumers. Henry's law constant (KH) is an important parameter in controlling the diffusion of organic compounds from the water to the vapor-phase, so its evaluation is of significance in the study of odor events. In this paper, the KH of a wide range of trihalogenated anisoles – in its dimensionless form K′HK′H – were calculated at two temperatures, 45 and 22 °C using equilibration partitioning in a closed system and headspace microextraction (EPICS-SPME). Two methodological approaches, Ramachandran and Dewulf, were used for the assessment of the Henry's law constant. Nevertheless, to apply these methods to THAs, a relatively narrow headspace/water volume ratio range (80/1–8/1) is required. At these conditions, a linearity (r2) using Ramachandran's theoretical relationship from 0.9276 to 0.9989 was obtained and the variability (R.S.D.%) when Dewulf's theoretical relationship was employed was lower than 20% (n = 5).
Journal: Analytica Chimica Acta - Volume 589, Issue 1, 18 April 2007, Pages 133–136