Polarographic determination of 9,10-anthraquinone and its 1,2- 1,4- and 1,8-dihydroxy derivatives in chloroform Application to the analysis of papers and black liquors.
The polarographic behaviour of 9,10-anthraquinone (I) and some of its dihydroxy derivatives, such as alizarin (II), quinizarin (III) and chrisazin (IV) has been studied in the presence of proton donors of HA and HB(+) type. After optimization of conditions for reversible reduction of the anthraquinones, various polarographic techniques were used for the determination of anthraquinones in chloroform. In the dc method, the relative standard deviation for the determination of 1mM concentrations was about 1.5%. In the ac method, the detection limit was 0.1 mug/ml and the relative standard deviation for determination at the 0.2 mug/ml level was 2%. The proposed methods are usable for the simultaneous determination of I and II, II and III, II and IV, and have been applied to the determination of 9,10-anthraquinone in papers and black liquors.
Pournaghi-Azar
M H
MH
Electroanalytical Chemistry Laboratory, Faculty of Science, University of Tabriz, Tabriz, Iran.
Golabi
S M
SM