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The additivity of the absorbance of europium and zinc complexes with xylenol orange and its application in spectrophotometric determination of europium and zinc
Author(s) -
ChengMin Liu,
XiTseng Chih,
ShuQuan Liang,
Liang ShuChuan
Publication year - 1987
Publication title -
acta chimica sinica english edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.28
H-Index - 41
eISSN - 1614-7065
pISSN - 0256-7660
DOI - 10.1002/cjoc.19870050306
Subject(s) - xylenol orange , chemistry , europium , zinc , absorbance , masking agent , inorganic chemistry , copper , xylene , thiourea , nuclear chemistry , chromatography , organic chemistry , benzene , ion
Abstract It is found experimentally that the absorbance of a mixture of the europium – Xylenol Orange (XO) and zinc — XO complexes in slightly acidic media is equal to the sum of the individual absorbances measured alone, within ±2%. When a mixture of rare earths (instead of europium) is measured together with zinc, the maximum deviation for additivity is within ca. ±3%. On the basis of this additivity of absorbances, a procedure can be devised to determine europium and zinc together spectrophotometrically with XO, and then europium alone after extraction of zinc(II) with trioctylamine / xylene. The interference of aluminium, and copper(II) may be avoided by masking with sulphosalicylic acid and thiourea respectively.