were evaporated to dryness under an infrared lamp, the residue was taken up in 10 ml of water and the oxidation carried out as described above. A blank test was carried out simultaneously. The bromine content in grams per 1OOg was found from the expressionc x 0-125 x 79-92 x 100 3 where c is the concentration of the solution (mole 1-l) found from the calibration curve.
DETERMINATION OF IODINE-The remainder of the solution prepared for the chlorine determination was freed from oxygen, mixed with 0.1 ml of Triton X-100 solution, and its polarogram recorded from -0-45 to +0*20V (versus S.C.E.). The height of the wave was measured at 0-OV, after correction for the residual current, by means of graphical extrapolation. The results were evaluated with the aid of a calibration curve recorded for 0.1 M potassium nitrate (supporting electrolyte). The iodine content in grams per 100 g was found from the expressionc x 0.0714 x 126.92 x 100 5
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