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ERIC Number: EJ827443
Record Type: Journal
Publication Date: 2008-Jul
Pages: 3
Abstractor: As Provided
ISSN: ISSN-0021-9584
Measurement of Henry's Law Constants Using Internal Standards: A Quantitative GC Experiment for the Instrumental Analysis or Environmental Chemistry Laboratory
Ji, Chang; Boisvert, Susanne M.; Arida, Ann-Marie C.; Day, Shannon E.
Journal of Chemical Education, v85 n7 p969-971 Jul 2008
An internal standard method applicable to undergraduate instrumental analysis or environmental chemistry laboratory has been designed and tested to determine the Henry's law constants for a series of alkyl nitriles. In this method, a mixture of the analytes and an internal standard is prepared and used to make a standard solution (organic solvent) as well as a dilute aqueous solution. Both the standard solution and the headspace samples above the aqueous solution at partitioning equilibrium in closed containers are subject to gas chromatographic (GC) analysis. The dimensionless Henry's law constants, H[subscript i], of the analytes can be calculated from the known H[subscript i] of the internal standard and the GC peak area ratios. The temperature dependence of H[subscript i] may also be studied through the collaboration among several student groups. The experiment is methodologically simple and can be completed in less than four hours. However, the approach is only applicable to compounds that have dimensionless Henry's law constants in the order of 10[superscript -3] or less. (Contains 3 tables and 1 figure.)
Division of Chemical Education of the American Chemical Society. Subscription Department, P.O. Box 1267, Bellmawr, NJ 08099-1267. Tel: 800-691-9846; Tel: 856-931-5825; Fax: 856-931-4115; e-mail:; Web site:
Publication Type: Journal Articles; Reports - Evaluative
Education Level: Higher Education
Audience: N/A
Language: English
Sponsor: N/A
Authoring Institution: N/A
Grant or Contract Numbers: N/A