Determination of V(V), Nb(V) and Ta(V) as their 2-(5-bromo-2-pyridylazo)-5-diethylaminophenol chelates by reversed-phase HPLC

H Wang; Y X Miao; H S Zhang; J K Cheng

doi:10.1016/0039-9140(94)80049-9

Determination of V(V), Nb(V) and Ta(V) as their 2-(5-bromo-2-pyridylazo)-5-diethylaminophenol chelates by reversed-phase HPLC

Talanta. 1994 May;41(5):685-9. doi: 10.1016/0039-9140(94)80049-9.

Authors

H Wang¹, Y X Miao, H S Zhang, J K Cheng

Affiliation

¹ Department of Chemistry, Wuhan University, Wuhan 430072, China.

PMID: 18965983
DOI: 10.1016/0039-9140(94)80049-9

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.