Spectrophotometric determination of micro-amounts of vanadium with 5,7-di-iodo-8-hydroxyquinoline.
A precise spectrophotometric method for the determination of 2.5-25 mug of vanadium in volumes of up to 500 ml of water was developed. The method is based on the simultaneous concentration (100-1000 fold) and complexation of vanadium(V) with di-iodo-oxine in a water-immiscible phase. Interference from iron is eliminated by masking with phosphoric acid. The standard deviation evaluated was +/-0.04 mug for solutions containing 5 mug vanadium.
Heitner-Wirguin
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C
Department of Inorganic and Analytical Chemistry, The Hebrew University, Jerusalem, Israel.
Gancz
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