title: Liquid chromatographic determination of ethylenethiourea using pulsed amperometric detection.
abstract: A liquid chromatographic method was developed using pulsed amperometric detection at a gold working electrode to measure residue levels of ethylenethiourea (ETU) in crops and groundwater. Use of the sequential pulsing program eliminates electrode fouling while preserving the sensitive and selective detection of ETU. Minimum detection limits in crops were 5-10 ppb (1.25-2.5 ng on-column) and 5 ppb (0.5 ng) in groundwater. The commercial availability of the pulsed electrochemical detector and its gold working electrode that remains functional with a minimum of conditioning is an improvement in method simplicity.
authors.affiliation: Department of Environmental Biochemistry, University of Hawaii, Honolulu 96822.
authors.forename: D R
authors.initials: DR
authors.lastname: Doerge
authors.forename: A B
authors.initials: AB
authors.lastname: Yee
mesh_terms: D002853:Chromatography, Liquid / Q000379:methods*; D005031:Ethylenethiourea / Q000032:analysis*; D005506:Food Contamination; D005638:Fruit / Q000737:chemistry*; D005659:Fungicides, Industrial; D014867:Water / Q000032:analysis*
chemical_list: D005659:Fungicides, Industrial; D014867:Water; D005031:Ethylenethiourea