Abstract
In the combustion of samples for iodine analysis, if very little organic matter is present this may be broken up by alkaline fusion and the decomposition products burned by a micro-Kjeldahl technic in the micro still (Fig. 4 1 ).
Two hundred cc of water or 5 cc of urine plus 1 pellet NaOH is evaporated to dryness in a nickel crucible and 2 mg rare earth oxide added. Dry samples, such as seaweed or thyroid gland, are chosen small enough to contain about 0.2y of iodine and are fused with NaOH in a nickel crucible. A urine sample may require 1 g NaOH for fusion and a water residue about the same. Heating is continued until bubbles of NH3 cease to be given off. Water is added to dissolve the fusion and 5 mg sodium azide added to destroy nitrite and reduce iodate. The samples are then transferred to the micro still and analyzed by the McClendon-Bratton method. 1
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