The experience of the author and others with the <i>evaporation method</i> is described. The technique consists of evaporating trace amounts of impurities from the molten sample in an electrically heated crucible and condensing them on a water-cooled electrode, which is then arced or sparked. Temperatures used range from 1500 to 2000°C and element sensitivities from 20 to 0.02 ppm.

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