Quantitative accuracy in the gas chromatographic analysis of solvent mixtures
2003 (English)In: Journal of Chromatography A, ISSN 0021-9673, E-ISSN 1873-3778, Vol. 985, no 1-2, 21-27 p.Article in journal (Refereed) Published
Quantitative accuracy is of great importance in the analysis of bulk mixtures of solvents, particularly when the analysis is related to quality control of very large product volumes like in solvent recovery plants. Serious errors can be made if the effects of density differences between the pure solvents and volume contractions are not properly addressed. In earlier work, the use of an iterative process for correcting such errors has been suggested. However, in the case of volume contractions and mixtures of several solvents, this procedure is difficult to apply. In the present paper, we describe a simple procedure where calibration curves based on mass concentration are utilized. The densities of calibration mixtures of known compositions are determined with a density meter, in order to provide for correction factors caused by volume contractions. Model experiments with mixtures of water, ethanol, acetone and methanol showed a significant improvement in quantitative accuracy, when the suggested calibration strategy was applied.
Place, publisher, year, edition, pages
2003. Vol. 985, no 1-2, 21-27 p.
accuracy, calibration, external standards, volume contraction, molar excess volumes, gas chromatography, ethanol, water, methanol, acetone
IdentifiersURN: urn:nbn:se:kth:diva-4909DOI: 10.1016/S0021-9673(02)01830-7ISI: 000180580400004OAI: oai:DiVA.org:kth-4909DiVA: diva2:6845
QC 201009282008-12-232008-12-232010-09-28Bibliographically approved