Six crystalline phases of nonsolvated aluminum hydride were prepared by desolvation of AIH3 etherate in the presence of small amounts of LÍAIH4. The most stable phase, a-AlHj, was prepared both from the solid metastable phases and by crystallizing directly from a refluxing diethyl ether-benzene solution. Both the thermal stability and ease of preparation of aluminum hydride phases are highly dependent upon purity.Aluminum hydride (alane) was first reported as an impure solid* and subsequently as amine2"4 or ether complexes.5 A convenient synthesis of aluminum trihydride diethyletherate was developed by Finholt, Bond, and

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Sechs kristalline Phasen von unsolvatisiertem AlH3 werden durch Desolvatisierung von AlH3‐Ätherat in Gegenwart kleiner Mengen LiAlH4 dargestellt.

The thermal and/or catalytic degradation of chloride‐containing polymers causes dehydrohalogenation which produces hydrochloric acid. A nonaqueous method has been developed for the termination of hydrochloric acid. The sample is dissolved in tetrahydrofuran and titrated potentiometrically with a standard tetrabutylammonium hydroxide solution in a 7.5% (V/V) aqueous tetrahydrofuran solution with a combination glass‐calomel electrode. The method has a relative precision of ±3.7% at the 95% confidence limit and a sensitivity of 25 ppm HCI.

A spectrophotometric method has been developed for the determination of oxidizing substances in food-grade hydrochloric acid. The method is based on the reaction of oxidizing substances with potassium iodide to form triiodide ion (I-3) whose absorbance is then measured at 485 nm. Oxidizing substances is reported as fig Cl2/mL. The method is applicable to oxidizing substances in the range of approximately 9-37 μgCl2/mL.