title: A new method for monitoring the contamination of glycerol with diethylene glycol.
abstract: A quartz crystal microbalance has been used to check the purity of glycerol. The experimental procedure involves no derivatization or other preliminary step except determination of water content. The protocol consists of the direct reading of the frequency of a quartz crystal with one face in contact with an aqueous solution of the glycerol to be tested. The method is inexpensive, simple, rapid, and highly sensitive; diethylene glycol contamination at the 3.61% level could be detected.
authors.affiliation: Department of Chemistry, University of Aveiro, Portugal.
authors.forename: M T
authors.initials: MT
authors.lastname: Gomes
authors.forename: M I
authors.initials: MI
authors.lastname: Veríssimo
authors.forename: J A
authors.initials: JA
authors.lastname: Oliveira
mesh_terms: D015374:Biosensing Techniques / Q000295:instrumentation / Q000379:methods*; D002626:Chemistry, Pharmaceutical; D005026:Ethylene Glycols / Q000032:analysis*; D005990:Glycerol / Q000032:analysis / Q000302:isolation & purification*; D011791:Quartz
chemical_list: D005026:Ethylene Glycols; D011791:Quartz; C013484:diethylene glycol; D005990:Glycerol