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A system is described for on-line data collection and automated ion focusing of a single focusing magnetic deflection mass spectrometer equipped with gas chromatographic inlet and accelerating voltage alternator.

Erratic results in the determination of tungsten led to a study of the variables influencing the stannous chloride thiocyanate method. Free acid and chloride concentrations determine the degree of reduction of the tungsten. With 7.00, 5.95, and 3.63 moles of chloride per liter, the lower limits of free acid to achieve complete reduction are 9.5,11.2, and 13.9 moles per liter, respectively. The thio-

No abstract

This study is an extension of previous work on separations in which