Determination of trace vanadium (V) in seawater and fresh water by the catalytic kinetic spectrophotometric method |
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Authors: | Hongwei Ji Yuanyuan Sha Huizhen Xin Shuang Li |
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Institution: | College of Chemistry and Chemical Engineering,Key Laboratory of Marine Chemistry Theory and Technology,Ministry of Education,Ocean University of China,Qingdao 266100,P.R.China |
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Abstract: | A new kinetic spectrophotometric method has been developed for the determination of vanadium (V). The method is based on the
catalytic effect of vanadium (V) on the oxidation of weak acid brilliant blue dye (RAWL) by KBrO3 using the citric acid as activation reagent. The obtained optimum conditions are: c (RAWL) = 1×10?4 molL?1, c (KBrO3) = 3×10?2 molL?1, c (citric acid) = 9×10?3 molL?1, pH = 2.50, the reaction time being 7.0 min and the temperature being 25.0°C. Under the optimum conditions, the proposed
method allows the determination of vanadium (V) in the range of 0–70.0 ng mL?1 and the detection limit is down to 0.407 ng mL?1. For standard vanadium (V) solution determination, the recovery efficiency is in the range of 98.5%–102% and the RSD ranges
from 0.76%–1.25%. Moreover, it is demonstrated that most cations and anions do not interfere with the determination of vanadium
(V) under the analytical condition. The new method was successfully applied in the determination of vanadium (V) in fresh
water and seawater samples with satisfactory results. Vanadium (V) in the seawater samples from Qingdao offshore was determined
using the method and the distribution of vanadium (V) was mapped. Compared with other instrumental analytical methods, the
proposed method shows good selectivity, sensitivity, simplicity, lower cost and rapidity. It can be employed on shipboard
easily. |
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Keywords: | vanadium(V) kinetic-spectrophotometry catalytic effect seawater |
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