Extraction-spectrophotometric determination of zinc(ii) with 4-(2-pyridylazo)-resorcinol and a quaternary ammonium salt

D Nonova; V Nenov; N Lihareva

doi:10.1016/0039-9140(76)80227-5

Extraction-spectrophotometric determination of zinc(ii) with 4-(2-pyridylazo)-resorcinol and a quaternary ammonium salt

Talanta. 1976 Sep;23(9):679-81. doi: 10.1016/0039-9140(76)80227-5.

Authors

D Nonova¹, V Nenov, N Lihareva

Affiliation

¹ Department of Analytical Chemistry, University of Sofia, 1 Anton Ivanov Avenue, Sofia 26, Bulgaria.

PMID: 18961957
DOI: 10.1016/0039-9140(76)80227-5

Abstract

A simple and sélective extraction spectrophotometric determination of zinc is described. The complex [Zn(PAR)(2)](CDBA)(2), where PAR is the 4-(2-pyridylazo)resorcinol anion and CDBA is cetyldimethylbenzylammonium ion, is extracted from a solution buffered at pH 9.7 with carbonate/bicarbonate. Beer's law is obeyed over the range 0.2-1.2 ppm zinc, the molar absorptivity being 9.2 x 10(4) 1 .mole(-1).cm(-1). The precision in this range is 0.0056 ppm. Cadmium in up to a 50-fold w w ratio may be masked with diethyldithiocarbamate.