The report describes the advances in instrumentation and the research activities of the Analytical Mass Spectrometry Section during the period July 1968 to June 1969.Chemical and mass spectrometric procedures are described for the determinations of the absolute isotopic abundance ratios of natural rubidium, boron in a natural boric acid and a 10B enriched boric acid, and of uranium in six SRMs.Procedures are also described for the determination of trace amounts of copper and lead in steel, and silver, copper, boron and uranium in glass by isotope dilution mass spectrometry.(Author).

The report describes the advances in instrumentation and the research activities of the Analytical Mass Spectrometry Section during the period July 1967 to June 1968.Advances in instrumentation include the construction of the electronic interface automating both the control of the multistage instrument, and the digital readout and data reduction.A new and improved beam valve is also described.Elements studied during this period include: B, Ni, Pb, Li, U, and Pu.Chemical procedures are given for B, Pb, CaF2, U, and Pu; mass spectrometric procedures are given for B.(Author).

The report is the fifth in a series of annual progress reports of the Spectrochemical Analysis Section of the Analytical Chemistry Division of the National Bureau of Standards. Briefly discussed is research on the following topics:Optical spectrometry (High-aperture spectrograph, Microanalysis in the DC arc); Electron probe microanalysis (New technique and instrumentation for target current scanning, Color composite X-ray scans); X-ray fluorescence spectrometry; Spark source mass spectrometry (New pump for plate prepump section, Use of 100-mesh grids to remove matrix line broadening, Homogeneity testing of iron in high purity gold SRM 685, Survey analysis of a steel sample, Trace characterization of spark source ion samples of SRM platinum 681); Preconcentration techniques (High purity metals, Ingot iron and steels, Simulated lunar glasses, Ultra-pure liquid reagents).

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