Published procedures for the determination of potassium as the tetraphenylboron salt have been critically examined. It has been shown that quantitative precipitation of the potassium salt in a readily filterable form is made preferably from solutions in which the total acidity is greater than about 0.2 N . Solutions of acidity up to 0.66 N have been employed at a temperature of 0°C.When the determination is made at room temperature, high results may be obtained owing to contamination of the precipitate by decomposition products of the tetraphenylboron. This is completely prevented by carrying out the determination a t a temperature of 0" C. Under such conditions accurate results have been obtained on potassium in amounts up to 25 mg.The method has been applied to the determination of potassium in solutions containing a wide range of commonly occurring ions. Thus, in addition to its simplicity, it is considered to be more specific than the well known alternative procedures. * This acidity is less than that employed in the experimental work described on pp. 350 and 351. There appeared to be no advantage in using an acidity much greater than the minimum value required to give good filtration. It is sufficiently high to prevent co-precipitation of impurities, such as iron, when present.

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Methods are described here for the preparation of DCl and alcohols-OD from the corresponding silanes by simple and rapid procedures using heavy water.