[Indirect determination of trace amount of oxalic acid radical by the I2-CCl4 extraction spectrophotometry].
The article studies that in dilute H2SO4 dielectric substance IO3(-) reacts with C2O4(2-) to release certain amount of iodine under certain reaction condition: 2IO3(-) + 5C2O4(2-) + 12H+ = I2 + 10CO2 increasing + 6H2O therefore the method of indirect determination with I2-CCl4 extraction spectrophotometry is established. The reaction temperature is controlled in 90 degrees C; the reaction time 3 minutes; the reaction acidity pH1.0-2.0. The common ion basically does not affect the determination. The lowest detection limit of C2O4(2-) is 0.08 microg x mL(-1). After comparing the method of the recovery experiment with that of other determination, a satisfactory result is aquired and the recovery is between 96-98%.
Shen
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Huizhou University, 516015 Huizhou.
D002138:Calibration; D002251:Carbon Tetrachloride / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D007455:Iodine / Q000737:chemistry*; D057230:Limit of Detection; D019815:Oxalic Acid / Q000032:analysis* / Q000302:isolation & purification*; D015203:Reproducibility of Results; D013053:Spectrophotometry; D013696:Temperature; D013997:Time Factors
D007455:Iodine; D019815:Oxalic Acid; D002251:Carbon Tetrachloride