title: Online preconcentration and determination of trace amounts of zinc in nature waters.
abstract: A simple, sensitive, reliable and flexible flow injection spectrophotometric method is proposed for on-line preconcentration and determination of trace amounts of zinc in water. At the presence of Tween-80 in pH 9.3 buffer solutions, the shade of color of Zn (II)-PAN complex is in a linear relation to the zinc amount at the point of the maximum absorption peak of 560 nm. The optimal experimental conditions, including reaction conditions and preconcentration conditions, had been obtained. The linear range of the proposed method was between 2.0 and 360 mug L(-1) and the detection limit was 0.42 mug L(-1). The relative standard deviation was 3.55% and 2.14% for 5.0 mug L(-1) and 50 mug L(-1) of zinc standard solution (n = 8). The method had been successfully applied to zinc determination in water samples and the analytical results were satisfactory.
authors.affiliation: College of Architecture and Environment, Sichuan University, Chengdu 610065, China.
authors.forename: Liang
authors.initials: L
authors.lastname: Wei
authors.forename: Xinshen
authors.initials: X
authors.lastname: Zhang
authors.forename: Yichun
authors.initials: Y
authors.lastname: Dai
authors.forename: Jin
authors.initials: J
authors.lastname: Huang
authors.forename: Yong-Hong
authors.initials: YH
authors.lastname: Xie
authors.forename: Kai
authors.initials: K
authors.lastname: Xiao