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The equilibrium phase diagram of the lithium‐selenium system has been investigated. A miscibility gap extends from 0.5 to 30.5 a/o (atom per cent) lithium above a monotectic temperature of 350.1°C; the critical temperature is greater than 800°C. The only intermediate phase found is Li2Se which melts at 1302°C.

The equilibrium phase diagram of the lithium‐sulfur system has been investigated. A miscibility gap extends from 0.2 to 37.0 atom per cent (a/o) lithium above a monotectic temperature of 364.8°C; the critical temperature is greater than 600°C. The only intermediate phase found is Li2S , which melts at 1372°C.

The relative amounts of primary and secondary sulfates in atmospheric aerosols and precipitation can be estimated from measurements of the stable oxygen isotope ratios. The oxygen-18 content of sulfates formed in power plant stack gases before emission into the atmosphere is significantly higher than that of sulfates formed from sulfur dioxide after emission. Results show that 20 to 30 percent of the sulfates in rain and snow at Argonne, Illinois, are of primary origin.

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