title: Determination of V(V), Nb(V) and Ta(V) as their 2-(5-bromo-2-pyridylazo)-5-diethylaminophenol chelates by reversed-phase HPLC.
abstract: This paper reports the separation and determination of V(V), Nb(V) and Ta(V) by RP-HPLC using 5-Br-PADAP as a precolumn derivatizing reagent. On C(18) column, the three metal chelates can be separated on a baseline in 9 min with the mobile phase of methanol-water (59:41, v/v) containing tartaric acid (0.2%) and acetate buffer (pH 3.5, 10 mM). The detection limits of V(V), Nb(V) and Ta(V) are 0.13 ppb, 0.22 ppb and 1.79 ppb, respectively when S/N is 3. This method is simple and rapid, and has been used in mineral analysis with satisfactory results.
authors.affiliation: Department of Chemistry, Wuhan University, Wuhan 430072, China.
authors.forename: H
authors.initials: H
authors.lastname: Wang
authors.forename: Y X
authors.initials: YX
authors.lastname: Miao
authors.forename: H S
authors.initials: HS
authors.lastname: Zhang
authors.forename: J K
authors.initials: JK
authors.lastname: Cheng