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Published on: March 18, 2012
Kinetic spectrophotometric method for the determination of trace amounts of oxalate by an activation effect
Mansour Arab Chamjangali1, Vahid Keley, Ghadamali Bagherian
1College of Chemistry, Shahrood University of Technology, Shahrood 36155-316, Iran. marab@shahrood.ac.ir
Abstract:
A new, simple and inexpensive kinetic catalytic spectrophotometric method for the determination of oxalate is described. The method is based on an activation effect of oxalate on a catalytic effect of iron(II) on the oxidation of iodide by bromate. The reaction is monitored by measuring the absorbance of triiodide ion at lambda max = 352 nm. A calibration graph was obtained from 0.10 - 7.0 microg cm(-3) of oxalate with a detection limit of 0.080 microg cm(-3). The standard deviations for ten replicate determinations of 0.50, 1.0 and 5.0 microg cm(-3) of oxalate were 4.0, 2.6 and 1.8%, respectively. The applicability of the method was demonstrated by the determination of oxalate ion in real samples.
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