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Solid Phase Extraction of Thallium(III) on Micro Crystalline Naphthalene Modified with N , N′ ‐Bis(3‐methylsalicylidene)‐ ortho ‐phenylenediamine and Determination by Spectrophotometry
Author(s) -
MOGHIMI Ali
Publication year - 2008
Publication title -
chinese journal of chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.28
H-Index - 41
eISSN - 1614-7065
pISSN - 1001-604X
DOI - 10.1002/cjoc.200890330
Subject(s) - chemistry , thallium , detection limit , naphthalene , spectrophotometry , extraction (chemistry) , solid phase extraction , o phenylenediamine , analytical chemistry (journal) , relative standard deviation , nuclear chemistry , chromatography , inorganic chemistry , organic chemistry , catalysis
A novel, simple, sensitive and effective method has been developed for preconcentration of thallium on N , N′ ‐bis(3‐methylsalicylidene)‐ ortho ‐phenylenediamine (MSOPD) adsorbent in a pH range 5.0–10.0, prior to its spectrophotometric determination, based on the oxidation of bromopyrogallol red at λ =520 nm. This method makes it possible to quantitize thallium in a range of 3.6×10 −9 to 2.0×10 −5 mol/L, with a detection limit ( S / N =3) of 1.42×10 −9 mol/L. This procedure has been successfully applied to determine the ultra trace levels of thallium in the environmental samples, free from the interference of some diverse ions. The precision, expressed as relative standard deviation of three measurements, is better than 2.9%.