title: Simultaneous determination of iron and zinc by pH gradient construction in a flow-injection system.
abstract: A flow-injection method for the simultaneous determination of iron and zinc in the human hair with 2-(5-bromo-2-pyridylazo)-5-diethylaminophenol (5-Br-PADAP) using a pH gradient technique has been developed. The linear range for the determination of iron is 0.1 approximately 1.8 mug ml(-1) and for zinc is 0.2 approximately 5.0 mug ml(-1). About 20 approximately 30 samples can be determined in 1 h. The proposed method is simple, rapid and accurate. It has been applied to the simultaneous determination of trace amounts of iron and zinc in the human hair with satisfactory results.
authors.affiliation: Department of Polymer Chemical Engineering, Shenyang Institute of Chemical Technology, Shenyang, China.
authors.forename: S
authors.initials: S
authors.lastname: Zhao
authors.forename: X
authors.initials: X
authors.lastname: Xia
authors.forename: G
authors.initials: G
authors.lastname: Yu
authors.forename: B
authors.initials: B
authors.lastname: Yang