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Platinum, palladium and rhodium have been determined in 18 U.S. Geological Survey reference materials by graphite furnace atomic absorption spectrometry after preconcentration by the classical leadfree assay technique. A comparison with literature values shows clearly the need for additional data on these samples before “best” values can be assigned.

Three spectrometers and associated experiments are described. The work reviewed comprises the early experimental phases of a program to develop a satellite infrared spectrometer capable of making radiometric measurements in the 15-micron carbon dioxide band needed for deduction of atmospheric temperature profiles. Initially, a simplified, breadboard spectrometer with four spectral channels was used to determine the temperature profile of the lower atmosphere from the ground. Next, a commercial spectrophotometer was modified and another determination of the atmospheric temperature profile was made using more spectral intervals. Instrument specifications for a balloon flight model spectrometer were aerived from these experiments. Following the model's fabrication, testing, and calibration, two high-altitude balloon flights were conducted to demonstrate that the atmospheric temperature profile could be ascertained from above the atmosphere.

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