title: Spectrophotometric determination of rare earth elements by flow injection analysis based on their reaction with xylenol orange and cetylpyridinium bromide.
abstract: Individual rare earth elements (REE) and their mixtures were determined by a FIA method based on the reaction with Xylenol Orange (XO) in the presence of cetylpyridinium bromide (CPB). Volumes of 30 microl of 2.5-25 microM REE solutions were injected into a carrier stream of 0.1M acetate buffer of pH 4.5 or 5.5 that was 0.06 mM in XO and 0.6 mM in CPB. At 1.8 ml/min flow rate, a sampling frequency of up to 100 samples per hour was achieved. The detection limits were in the range of 0.1-0.4 microg/ml REE and relative standard deviation of the measurement was 0.88% rel.
authors.affiliation: Química Analítica, Universitat Autònoma de Barcelona, Bellaterra, Barcelona, Spain.
authors.forename: J
authors.initials: J
authors.lastname: Havel
authors.forename: C
authors.initials: C
authors.lastname: Moreno
authors.forename: A
authors.initials: A
authors.lastname: Hrdlicka
authors.forename: M
authors.initials: M
authors.lastname: Valiente