1980 Volume 21 Issue 3 Pages 214-218_1
An analytical procedure was developed for the qualitative and quantitative determination of total bromide residues in agricultural products, using a detector tube.
A 20g sample was added to 25ml of alkaline monoethanolamine solution and ashed. The ashed residue was dissolved in 0.1N NaOH and filtered into a flask. Next, 0.5g potassium permanganate and 5ml of phosphoric acid were added, and the analysis apparatus (Fig. 1), including a detector tube, was assembled. After bubbling air (flow rate, 80ml/min) through the sample solution for at least 3 hours, the detector tube was removed from the apparatus and the length of the color change in the tube was measured. (The bromine reacted nearly quantitatively with fluorescein to produce tetrabromofluorescein, and the color changed from yellow to reddish-pink.)
The recoveries of bromide added to rice, wheat, chestnut and cherry were more than 97%, and the detection limit was 1ppm.
The present method was found to be satisfactory for the qualitative and quantitative determination of total bromide in agricultural products.
