Microprecipitation and δ18O analysis of phosphate for paleoclimate and biogeochemistry research

Slow microprecipitations lead to complete precipitation of phosphate without contaminating O-bearing phases. We develop a rapid precipitation technique that avoids the problems noted above. Both the slow microprecipitation and the rapid microprecipitation developed herein lead to δ18Op measurements that are indistinguishable from those made on conventional large-batch precipitations of Ag3PO4.