NEMI Method Summary

Method Summary Information

Method Number: I-2880 Media: WATER
Revision: Aug-90
Method Source: U.S. Geological Survey (USGS)
Subcategory: INORGANIC Analytes in this method
Official Name: Vanadium, colorimetry, catalytic oxidation, automated-segmented flow
Descriptive Name Vanadium, dissolved, colorimetry
Source Info: USGS Branch of Information Services
Box 25286, MS 417
Federal Center
Denver, CO 80225-0286
Phone: 303-202-4700
Citation: U.S. Geological Survey Open-File Report 93-125
118645 Byte file
Brief Method
Summary:
 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).
Scope And
Application:
 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.
Applicable
Conc Range:
 1.0 to 40 ug/L
Interferences: 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.
Sample Handling: Container description: 250 or 500 mL polyethylene bottle.
Treatment and handling: Filter through 0.45-um filter; use filtered sample to rinse container.
Max Holding Time:
 180 days
 
Relative Cost: Less than $50
5488
Page 1