Physics
Scientific paper
Jan 1960
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1960gecoa..18...81t&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 18, Issue 1-2, pp.81-93
Physics
10
Scientific paper
An analytical procedure is presented for the determination of the O 18 / O 16 ratio in orthophosphate and condensed phosphate. In the described procedure the phosphate is first purified, and then finally precipitated as BiPO 4 . The phosphate oxygen is released by the following reaction; then it is purified and analysed mass spectrometrically: BiP 0 4( s ) + 8/3 BrF 3( l ) BiF 3( s ) + PF 5( g ) + 4/3 Br 2( g ) + 2 O 2( g ) The method is quantitative, free from isotopic fractionation and exchange, and precise to ±0.15 . A correction can be made for the contaminating effect of water oxygen introduced during the hydrolysis of the condensed phosphates. The possibilities are given for the use of this procedure in the measurement of paleotemperatures.
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