USGS Test Method I-2880

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Method Name:
Vanadium, dissolved, colorimetry . Official Name: Vanadium, colorimetry, catalytic oxidation, automated-segmented flow

Small concentrations of vanadium catalyze the acid-persulfate oxidation of gallic acid. This reaction proceeds rapidly in the presence of vanadium but only slowly in its absence. The amount of colored oxidation product formed by this reaction is directly proportional to the concentration of vanadium when temperature, reaction time, and concentration of reactants are carefully controlled (Jarabin and Szarvas, 1961; Fishman and Skougstad, 1964; Weigo, 1983).

This method is used to analyze samples of most water containing from 1.0 to 40 ug/L vanadium, provided that the interferences identified below are not exceeded. Concentrations of vanadium greater than 40 ug/L must be reduced by dilution. This modified method was implemented in the National Water Quality Laboratory in August 1990.

M.J. Fishman, 1993, Methods of analysis by the U.S. Geological Survey National Water Quality Laboratory--Determination of inorganic and organic constituents in water and fluvial sediments: U.S. Geological Survey Open-File Report 93-125

Chloride, bromide, and iodide interfere when their concentrations exceed 200 mg/L (chloride), 250 ug/L (bromide), and 250 ug/L (iodide). Iron (II), iron (III), and copper (II) interfere when their concentrations exceed 300 ug/L [iron (II)], 500 ug/L [iron (III)], and 50 ug/L [copper (II)]. The concentrations of other ions are rarely large enough to interfere.Results are erratic for samples preserved with nitric acid.

QC Requirements:
Calibrate instrument using calibration standards (CAL); quality control samples (QCS); and laboratory blanks (LB) analyzed at a minimum of 1 for every 10 samples.

Maximum Holding Time:
180 days



1.0 to 40 ug/L

Accuracy was determined on 4 samples that ranged from 10.47 to 10.83 ug/L

Reporting Level defined as smallest measured concentration of a constituent that may be reliably reported using a given analytical method.

Revision Number:

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