A design criterion based on type and depth of damage is proposed to replace laboratory design curves that may have been distorted by CO 2 evolution. Furthermore, sandstone acidizing experiments have provided evidence that reprecipitation of dissolved silica from spent HF can be a real limitation to acidizing success if operational precautions are not taken. Finally, the potential for iron precipitation from spent HCI acidizing solutions is seen to be dependent on certain conditions such as iron oxidation state and the presence of carbonates.

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Chemical reactions between UF4 and fluorine to produce UF5 and UF6 were studied by the technique of matrix isolation and observation of infrared spectra of reacting species in the matrix.(AIP)

The infrared spectra of UF4 were recorded in matrices of neon, argon, krypton, xenon, oxygen, nitrogen, nitric oxide, and carbon monoxide. These data support a tetrahedral structure for UF4 in the gas phase. Nitrogen and carbon monoxide doped argon matrices were studied as well as a fluorine doped nitrogen matrix.

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