Improving the submicro determination of vanadium in natural water using primary-secondary wavelength spectrophotometry

摘要

In acidic solution and in the presence of ammonium persulfate, the conventional reaction of vanadium(V) with gallic acid to form an orange complex has been used for the improvement of the determination of trace amounts of vanadium in water by the updated method named primary-secondary wavelength spectrophotometry (PSWS). The results show that the analytical precision and accuracy were improved and gave higher determination sensitivity than ordinary spectrophotometry. The relative standard deviations were less than 5.6%, and the recovery rate of V was between 94 and 105%.