A method of analysis of oxygen isotopes in orthophosphate--its use in the measurement of paleotemperatures

Physics

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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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