OR/14/067 Cation-exchange to remove cerium

Lapworth, D J, Surridge, B, Williams, P J, Heaton, T H E, and Gooddy, D C. 2014. Method for analysing phosphate 18O/16O ratios for waters with high C:P ratios. British Geological Survey Internal Report, OR/14/067.

Dowex 50w X-8 cation exchange resin was pre-prepared (see Preparation of Resins) by shaking with 1 M HNO₃ overnight and then rinsing with ultrapure water until a pH of approximately 6 was achieved.

• 4 ml of cation exchange resin was added to each sample

The samples were then shaken and left overnight.

Samples were then filtered using 0.45 µm Whatman puradisc filters.