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Updated: Aug 14, 2026

Atomic Layer Deposition of Vanadium Dioxide and a Temperature-dependent Optical Model
Published on: May 23, 2018
Non-extractive spectrophotometric determination of vanadium(v) in alloys and environmental, biological and soil
1Department of Chemistry, University of Chittagong, Bangladesh.
Abstract:
An ultra-sensitive and highly selective non-extractive spectrophotometric method is presented for the rapid determination of vanadium(v) at trace levels using 5,7-dibromo-8-hydroxyquinoline (DBHQ) as a new spectrophotometric reagent (lambda max = 400 nm) in slightly acidic solution (0.00015-0.016 mol-1 sulfuric acid). The reaction is instantaneous and the absorbance remains stable for over 48 h. The average molar absorption coefficient and Sandell's sensitivity were found to be 6.1 x 10(3) l mol-1 cm-1 and 0.015 micrograms cm-2 of Vv, respectively. Linear calibration graphs were obtained for 0.1-20 micrograms ml-1 of Vv: the stoichiometric composition of the chelate is 1:3 (V:DBHQ). Large excesses of over 50 cations, anions and complexing agents (e.g., tartrate, oxalate, citrate, phosphate, thio-urea, SCN-) do not interfere in the determination. The method was successfully used in the determination of vanadium in several Standard Reference Materials (alloys and steels) as well as in some environmental waters (potable and polluted), biological samples (human blood and urine), soil samples and complex synthetic mixtures. The method has high precision and accuracy (s = +/- 0.01 for 0.5 micrograms ml-1).
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