title: [Identification and determination of unknown chemicals in crops by dual-column GC system equipped with MS and ECD].
abstract: A dual-column GC system equipped with MS and ECD, using two identical columns (HP-1701), one connected to the MS and one to the ECD, has been developed. The carrier gas flow rate was adjusted to give the same retention time of each peak in both columns. Unknown peaks were detected and identified in 7 samples of crops using this system. It was confirmed that the unknown peaks were 5 pesticides, i.e., bromopropylate and others. The recoveries and CV of bromopropylate from spinach and Komatsuna were good. The results of determination of bromopropylate by both MS and ECD were the same. Unknown chemicals can be easily identified using GC equipped with MS and ECD, and this system should be useful in the field of food hygiene.
authors.affiliation: Yokohama City Institute of Health: 1-2-17, Takigashira, Isogo-ku, Yokohama 235-0012, Japan.
authors.forename: Kyoko
authors.initials: K
authors.lastname: Takahashi
authors.forename: Yasuo
authors.initials: Y
authors.lastname: Tanaka
authors.forename: Shiro
authors.initials: S
authors.lastname: Hosoi
authors.forename: Toshio
authors.initials: T
authors.lastname: Hidaka
authors.forename: Susumu
authors.initials: S
authors.lastname: Usui
mesh_terms: D018556:Crops, Agricultural / Q000737:chemistry*; D008401:Gas Chromatography-Mass Spectrometry / Q000295:instrumentation* / Q000379:methods; D010573:Pesticide Residues / Q000032:analysis* / Q000302:isolation & purification
chemical_list: D010573:Pesticide Residues