Downloaded from https://www.everyspec.com 4.2 Apply heat at such a rate that refhx- &l Water content. Record the volume of ing will start within 3 to 6 minutes G fter app]i@ion of heat. Exerciee caution that bent is not G ppIied too rapidly. Tbe con- deneed solvent should drip into the trap at a rate of 2 to 8 drops pe~*w+eond. Con- tinue the distillation for 1 to 1Y4 boun, then allow the trap and contente to cool to room ternperatulw water !n the trap, and add or subtract the correction quantity; cakulate and report the water content ae a percentage of the ti~l - weight of the mnple. &2 Method of determining ~ quantity.
The correctwn h tirmined by making a control te6t with 247.5 d of the eolvent and 2.5 ml of water. The difference in miIlilMere between the water added and recovered is the correction. If more water is rewvered than wau added (indicating that the edvent contains water), the cor- rection will be negative. If Ieae water is recovered than wae added, the corredion will be positive.
(Experirnenta have indi- @ed that the comdion h a ilxed quantity in milliliter and not a fixed perwntage.) 4.S DisX any drops uf water adhering totheaidea of thetraptitia~ or polytetrafluorethykne rod or other suitable means, and add these drops to the water layer, Gently agitate the two menisci with a en-d wire to separate the water G nd solvent. 5. RESULTS Method 108 40 }