title: Air-segmented amplitude-modulated multiplexed flow analysis.
abstract: Air-segmentation is applied to amplitude-modulated multiplexed flow analysis, which we proposed recently. Sample solutions, the flow rates of which are varied periodically, are merged with reagent and/or diluent solution. The merged stream is segmented by air-bubbles and, downstream, its absorbance is measured after deaeration. The analytes in the samples are quantified from the amplitudes of the respective wave components in the absorbance. The proposed method is applied to the determinations of a food dye, phosphate ions and nitrite ions. The air-segmentation is effective for limiting amplitude damping through the axial dispersion, resulting in an improvement in sensitivity. This effect is more pronounced at shorter control periods and longer flow path lengths.
authors.affiliation: Faculty of Pharmaceutical Sciences, Tokushima University, Tokushima, Japan.
authors.forename: Koji
authors.initials: K
authors.lastname: Inui
authors.forename: Takeshi
authors.initials: T
authors.lastname: Uemura
authors.forename: Takeshi
authors.initials: T
authors.lastname: Ogusu
authors.forename: Masaki
authors.initials: M
authors.lastname: Takeuchi
authors.forename: Hideji
authors.initials: H
authors.lastname: Tanaka
mesh_terms: D000388:Air; D017022:Flow Injection Analysis / Q000379:methods*; D007202:Indicators and Reagents / Q000737:chemistry; D009573:Nitrites / Q000032:analysis*; D010710:Phosphates / Q000032:analysis*; D012235:Rhodamines / Q000032:analysis*; D012996:Solutions / Q000737:chemistry; D013053:Spectrophotometry / Q000379:methods*; D014867:Water / Q000737:chemistry
chemical_list: D007202:Indicators and Reagents; D009573:Nitrites; D010710:Phosphates; D012235:Rhodamines; D012996:Solutions; D014867:Water; C022027:lissamine rhodamine B