The Sr and Rb contents of the granite G-1 and the diabase W-1

Flame Photometric Determination of Lithium, Rubidium, and Cesium in Silicate Rocks

“…c Average of five determinations, acid decomposition. 4 Single determination, chloroplatinate separation.…”

Quantitative Spectrochemical Determination of Barium and Strontium

“…The reported strontium content of this sample varies from 120 to 450 per gram. Recent determinations (13,17,31) of the strontium content of G-l and W-l suggest that the recommended values proposed by Ahrens (1) should be revised.…”

“…Chemical (3,14,18,34), colorimetric (33), emission spectrographic (4, 5, 10,16,19, 37, 31, 35), flame photometric (6, 9, 15, 35, 38, SO), mass spectrometric (13), polarographic (7), and x-ray fluorescence (8,17,30,31) analytical methods have been applied to the determination of barium and strontium in a variety of sample types with varying degrees of precision and accuracy. The absence of a reliable analytical technique for these elements is evident as only one standard sample is available which has a per cent composition for barium certified by the National Bureau of Standards to three significant figures.…”

Rare Alkali Elements in Trilobites

“…The rubidium abundance was based on spectrographic data obtained using G-l and W-l as standards with the Rb values recommended by Ahrens (1954 , Table 3-3). Work on these standards by Herzog and Pinson (1955) and Smales (1955) has shown that Ahrens' figure was about 2-5 times too large, so that Rankama's abundance estimate needs revising to about 160 ppm. Rb (Rb/Cs = 32).…”