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A simple method for the accurate determination of the Henry's law constant for highly sorptive, semivolatile organic compounds

Title
A simple method for the accurate determination of the Henry's law constant for highly sorptive, semivolatile organic compounds
Author
김기현
Keywords
Henry ' s law constant; Volatile fatty acid; Headspace analysis; Aqueous solution analysis
Issue Date
2016-01
Publisher
SPRINGER HEIDELBERG
Citation
ANALYTICAL AND BIOANALYTICAL CHEMISTRY, v. 408, NO 3, Page. 775-784
Abstract
A novel technique is developed to determine the Henry's law constants (HLCs# of seven volatile fatty acids #VFAs# with significantly high solubility using a combined application of thermal desorber/gas chromatography/mass spectrometry #TD/GC/MS#. In light of the strong sorptive properties of these semi-volatile organic compounds #SVOCs#, their HLCs were determined by properly evaluating the fraction lost on the surface of the materials used to induce equilibrium #vial, gas-tight syringe, and sorption tube#. To this end, a total of nine repeated experiments were conducted in a closed #static# system at three different gas/liquid volume ratios. The best estimates for HLCs #M/atm# were thus 7,200 #propionic acid#, 4,700 #i-butyric acid#, 4,400 #n-butyric acid#, 2,700 #i-valeric acid#, 2,400 #n-valeric acid#, 1,000 #hexanoic acid#, and 1,500 #heptanoic acid#. The differences in the HLC values between this study and previous studies, if assessed in terms of the percent difference, ranged from 9.2 % #n-valeric acid# to 55.7 % #i-valeric acid#. We overcame the main cause of errors encountered in previous studies by performing the proper correction of the sorptive losses of the SVOCs that inevitably took place, particularly on the walls of the equilibration systems #mainly the headspace vial and/or the glass tight syringe).
URI
https://link.springer.com/article/10.1007%2Fs00216-015-9159-3http://hdl.handle.net/20.500.11754/31724
ISSN
1618-2642; 1618-2650
DOI
10.1007/s00216-015-9159-3
Appears in Collections:
COLLEGE OF ENGINEERING[S](공과대학) > CIVIL AND ENVIRONMENTAL ENGINEERING(건설환경공학과) > Articles
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