Kinetic spectrophotometric method for the determination of trace amounts of oxalate by an activation effect. |
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| Authors: | Mansour Arab Chamjangali Vahid Keley Ghadamali Bagherian |
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| Affiliation: | College of Chemistry, Shahrood University of Technology, Shahrood 36155-316, Iran. marab@shahrood.ac.ir |
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| 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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