title: [Study on solid phase extraction and spectrophotometric determination of vanadium in environmental samples with 2-(2-quinolinylazo)-1,3-dihydroxidebenzene].
abstract: Based on the color reaction of 2-(2-quinolinylazo)-1,3-dihydroxidebenzene (QADHB) with vanadium (v) and the solid phase extraction of its colored complex with C18 cartridge, a new method for the determination of vanadium was studied. In the presence of CTMAB and citric acid-sodium hydroxide buffer solution (pH 3.5) medium. QADHB reacts with vanadium(II) to form a stable 2:1 complex. The colored complex was extracted by C18 cartridge and eluted the retained chelate from cartridge with ethanol (containing 2% of acetic acid), then can be determined by spectrophotometry at 552 nm. Beer's law is obeyed in range of 0-1.0 mg/l. This method can be applied to the determination of vanadium in environmental samples with good results.
authors.affiliation: Department of Chemistry, Kunming Teacher's College, Kunming 650031, China.
authors.forename: Yongchun
authors.initials: Y
authors.lastname: Cui
authors.forename: Xiaoman
authors.initials: X
authors.lastname: Zhang
authors.forename: Ping
authors.initials: P
authors.lastname: Zhai
authors.forename: Qiufen
authors.initials: Q
authors.lastname: Hu
authors.forename: Jiayuan
authors.initials: J
authors.lastname: Yin
authors.forename: Guangyu
authors.initials: G
authors.lastname: Yang
mesh_terms: D001391:Azo Compounds / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D007202:Indicators and Reagents / Q000737:chemistry*; D011804:Quinolines / Q000737:chemistry*; D013056:Spectrophotometry, Ultraviolet; D014639:Vanadium / Q000032:analysis* / Q000737:chemistry
chemical_list: C513970:2-(2-quinolinylazo)-1,3-dihydroxidebenzene; D001391:Azo Compounds; D007202:Indicators and Reagents; D011804:Quinolines; D014639:Vanadium