title: Rapid and selective chelatometric titration of zinc in non-ferrous alloys.
abstract: A rapid titrimetric method for the determination of Zn (5%) in zinc, aluminium and copper alloys is proposed. It is based on the chelation of Zn(II) with HEDTA as titrant in an ethanolic aqueous medium. The end-point is detected with hydrazidazol, a new indicator developed in China. Up to at least 6% Mn in the alloy does not interfere. Direct determination of Zn(II) is rendered possible by using a combination of masking agents. A separation is needed only if nickel is also present. A decided advantage of this method is its high selectivity. The standard deviation was found to be 0.07 mg and the coefficient of variation to vary from 0.2 to 0.5%. The method has been successfully used to determine Zn in different kinds of non-ferrous alloys, especially those containing Mn.
authors.affiliation: Shanghai Research Institute of Materials, The Ministry of Machine Building Industry, Shanghai, People's Republic of China.
authors.forename: Z
authors.initials: Z
authors.lastname: Nan
authors.forename: L
authors.initials: L
authors.lastname: Zhi-Ren
authors.forename: G
authors.initials: G
authors.lastname: Yuan-Xiang