期刊
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
卷 67, 期 1, 页码 92-97出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.saa.2006.06.028
关键词
thallium; preconcentration; microcrystalline naphthalene; 2,6-bis(N-phenyl carbamoyl) pyridine; spectrophotometry; bromopyrogallol red
类别
A novel, simple, sensitive and effective method has been developed for preconcentration of thallium on 2,6-bis(N-phenyl carbamoyl)pyridine-naphthalene adsorbent in the pH range 5.0-10.0, prior to its spectrophotometric determination, based on the oxidation of bromopyrogallol red at lambda = 518 nm. This method makes it possible to quantitize thallium, in the range of 3.0 x 10(-9) to 1.0 X 10(-5) M, with a detection limit (S/N = 3) of 1.2 x 10(-9) M. This procedure has been successfully applied to determine the ultra trace levels of thallium in the environmental and biological samples, free from the interference of some diverse ions. The precision, expressed as relative standard deviation of three measurements is better than 4.17%. (c) 2006 Elsevier B.V. All rights reserved.
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