FIELD: chemistry.
SUBSTANCE: to determine the fluoride ion a chromogenic complex zirkonine - zirconium is applied, that interacts with fluoride ion in a new analytic reaction: (C15H12N2O8S)2Zr+3HF+H+=[ZrF3]++2C15H14N2O8S, whereby the test sample is added to zirkonine complex with Zr, the optical density of the resulting solution is measured at a wavelength of 610 nm with respect to the reference solution containing no fluoride ion, and fluoride ion concentration in the sample is determined using the calibration curve. The method provides sensitivity of 0.02 mg/dm3, increased selectivity in the presence of sulfate, phosphate, nitrate and chloride ions, Al (III), Fe (III), and takes less than 1 minute.
EFFECT: increased sensitivity of the method.
1 dwg, 8 tbl, 8 ex
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Authors
Dates
2017-05-24—Published
2015-08-13—Filed