Behavior of β-Diketone Metal Chelates in Gas Chromatography and Effect of Chelate Stability on Detection Sensitivity
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A difference in detection sensitivity of β-diketone metal chelates by gas chromatography is produced by the difference in the metal present, irrespective of the difference in ligands or of detectors and the reason for it was examined by gas chromatography-mass spectrometry (GC-MS). When the chelates of copper (II) and iron (III), which show poor sensitivity in gas chromatography, were introduced directly into the ion source of a mass spectrometer, their ionic intensity was large but the ratio of molecular ion to total ion was smaller than that of the chelates of rhodium (III) and chromium (III), which show good detection sensitivity. When the sample was heated for gasification and collected in a gas reservoir for mass spectrometry, chelates of copper (II) and iron (III) showed great disintegration of the molecular ion and a large number of fragment ion species was produced. Ratio of molecular ions to total ions was greater in rhodium (III) and chromium-(III) chelates, with smaller number of fragment ions. Thus the difference in detection sensitivity according to the kind of a metal present was related to the ratio of molecular ions present to total ions of the metal chelates, and the difference in the detection sensitivity of β-diketone metal chelates in gas chromatography is affected largely by thermal stability of the chelates rather than by ionization efficiency of flame ionization detector and electron caputure ionization detector or to the stability of these chelates to ionization.
- 公益社団法人日本薬学会の論文
- 1976-08-25
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関連論文
- Analysis of Compounds containing Heavy Nitrogen (^N) by Infrared Absorption Spectra
- Behavior of β-Diketone Metal Chelates in Gas Chromatography and Effect of Chelate Stability on Detection Sensitivity