Ammonia nitrogen determination
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For the determination of ammonia nitrogen, distillation is used; during this process, the flask with a large belly moves up and down on the electric furnace, and it can be observed that the solution boils in pulses. Four or five glass beads are added. What’s going on here?
This post was last edited by qugd on 2016-12-28 at 14:39. The reasons for boiling over are, first, too high a heating temperature, and second, the antiboiling glass beads used being too new. Solutions: 1. Reduce the heating power appropriately; an autotransformer can be used for this purpose. 2. Mix glass beads with quartz sand and grind them on a shaker table – this will yield better results, as a rough surface on the glass beads facilitates the formation of boiling centers. 3. Use specialized zeolites to prevent bumping, such as broken ceramic pieces, or strip-shaped zeolites made by repeatedly stacking glass tubes. The tiny pores in zeolites create boiling vaporization centers. Note that if zeolites are to be reused, they need to be washed and dried in a vacuum oven.
This glass ball is too new; I don’t understand whether using a shaking table with quartz sand is meant to smooth it out or to increase the roughness of its surface