Astraphloxin Cyanine Dye as a Reagent for the Selective Extraction-Photometric Determination of Trace Mercury(II)

Research paper by M. V. Koroleva, A. D. Zorin, A. A. Kalugin, V. F. Zanozina, A. V. Erokhin

Indexed on: 01 Sep '05Published on: 01 Sep '05Published in: Journal of Analytical Chemistry


A procedure was developed for the extraction-photometric determination of low concentrations of mercury(II) in aqueous solutions. It is based on the reaction of the Hg Br3− acidocomplex with the Astraphloxin cationic dye to give an ion pair extracted with toluene. The detection limit for mercury is 0.015 mg/L. Effects of a number of heavy metal cations on determining mercury(II) were studied. It was shown that these effects appear in the presence of 500-fold molar amounts of interferents. The procedure was used for determining mercury(II) in the presence of 200-fold molar amounts of some heavy metal cations. The relative standard deviation was no worse than 5%.