title: Sequential liquid-liquid extraction graphite furnace atomic absorption spectrometric (GFAAS) and spectrophotometric determination of zirconium(IV) with calixarene hydroxamic acid.
abstract: A new calixarene hydroxamic acid, 25,26,27,28-tetrahydroxy-5,11,17,23-tetrakis (N-p-chlorophenyl) calix[4]arene hydroxamic acid (CPCHA) is synthesized and used for the extraction and graphite furnace atomic absorption determination of zirconium(IV). The extract is also determined spectrophotometrically as CPCHA-SCN complex having maximum absorbance at 447 nm with molar absorptivity 9.4x10(3) l mol(-1) cm(-1). The Beer's law obeys in the range of 1.0-9.5 ppm of zirconium. The graphite atomic absorption (GFAAS) increases the sensitivity by about 50 folds. The method is applied to the trace determination of zirconium(IV) in standard samples.
authors.affiliation: Department of Chemistry, School of Sciences, Gujarat University, Ahmedabad, 380009, India.
authors.forename: Y K
authors.initials: YK
authors.lastname: Agrawal
authors.forename: M
authors.initials: M
authors.lastname: Sanyal
authors.forename: P
authors.initials: P
authors.lastname: Shrivastav
authors.forename: S K
authors.initials: SK
authors.lastname: Menon