8-quinolinol-5-sulphonic acid as both indicator and masking agent-I: the zinc-ferrocyanide titration.
A method has been suggested by which microg amounts of Zn(II) in 10(-5)-10(-6)M solution can be titrated with K(4)Fe(CN)(6) in the presence of heavy metal cations, by using 8-quinolinol-5-sulphonic acid at pH 4 as a combined indicator and masking agent. Cd(II) interferes.
Bishop
J A
JA
Department of Chemistry, Cedar Crest College, Allentown, PA 18104, USA.