title: [Study on solid phase extraction spectrophotometric determination of zinc with 2-(2-quinolylazo)-5-dimthylaminophenol].
abstract: A highly sensitive, selective and rapid method for the determination of zinc based on the rapid reaction of zinc(II) with 2-(2-quinolylazo)-5-dimthylaminophenol (QADMAP) and the solid phase extraction of zinc ion with anion exchange resin cartridge was developed. In the presence of pH 8.5 buffer solution and Triton X-100 medium, QADMAP can react with zinc(II) to form a stable 2 :1 complex (QADMAP:Zn(II)). The molar absorptivity is 1.22 x 10(5)L x moL(-1) x cm(-1) at 590 nm. Beer's law is obeyed in the range of 0-1.0 microg x mL(-1). The zinc ions in the samples can be enriched and separated by solid phase extraction with anion exchange resincartridge. Testing results show that recovery for zinc(II) was from 95% to 104%, and RSD was below 3%. This method was applied to the determination of zinc in water and food with good results.
authors.affiliation: Laboratory for Conservation and Utilization of Bio-Resource & School of Life Science, Yunnan University, Kunming 650091, China.
authors.forename: Shi-ping
authors.initials: SP
authors.lastname: Zhou
authors.forename: Chang-qun
authors.initials: CQ
authors.lastname: Duan
authors.forename: Hong-cheng
authors.initials: HC
authors.lastname: Liu
authors.forename: Qiu-fen
authors.initials: QF
authors.lastname: Hu
mesh_terms: D001372:Aza Compounds / Q000737:chemistry*; D002852:Chromatography, Ion Exchange / Q000295:instrumentation / Q000379:methods*; D005504:Food Analysis; D009682:Magnetic Resonance Spectroscopy / Q000379:methods; D013058:Mass Spectrometry / Q000379:methods*; D015394:Molecular Structure; D011804:Quinolines / Q000737:chemistry*; D052616:Solid Phase Extraction / Q000295:instrumentation / Q000379:methods*; D013053:Spectrophotometry / Q000379:methods; D013055:Spectrophotometry, Infrared / Q000379:methods; D013057:Spectrum Analysis / Q000379:methods*; D014867:Water / Q000737:chemistry; D015032:Zinc / Q000032:analysis* / Q000737:chemistry
chemical_list: C472811:2-(2-quinolinylazo)-5-dimethylaminophenol; D001372:Aza Compounds; D011804:Quinolines; D014867:Water; D015032:Zinc