“…In this sense, development of analytical procedures for its determination has attracted much interest. Procedures for vanadium determination have been implemented in several types of samples, employing detection techniques such as uorimetry, 14 spectrophotometry, 2,7,10,12,[17][18][19] atomic absorption spectrometry with electrothermal atomization, 20,21 and optical emission spectrometry with inductively coupled plasma. 22,23 Spectrophotometry is a detection technique widely employed for vanadium determination and to improve sensitivity, analytical procedures have been implemented employing preconcentration steps including solvent extraction, 5,10 solid phase extraction 7,12 and solid phase spectrophotometry.…”