1978 Volume 51 Issue 12 Pages 3496-3499
A new photometric method has been developed for determining nitrite ions. This method is based on the kinetic effect of nitrite ions on the color-fading of the iron(III) thiocyanate complex in dilute nitric acid solution in the presence of iodide ions. The reaction is initiated by adding an ammonium iron(III) sulfate solution to the sample solution containing a mixture of potassium thiocyanate and potassium iodide at 25 °C. A concentration of nitrite ions, ranging from 0.0005 to 10 ppm can be determined by measuring the absorbance at 460 nm at a given time after the initiation using four appropriate calibration curves. Silver, mercury(II), iron(II), sulfide, sulfite, thiosulfate, chromate and cyanide ions in the concentration range from 0.1 to 1 ppm level interfered with the determination.
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