²¹⁰Po and ²¹⁰Pb from 5-10 L using Co-APDC coprecipitation

This method specifies the minimum requirements and laboratory methods for the analysis of total ²¹⁰Pb and ²¹⁰Po in seawater samples and involves a coprecipitation of Co(NO3)2 and APDC which is filtered, purified and plated for alpha counting.

Samples are collected in acid-cleaned containers and pretreated on board, by acidifying and co- precipitating the samples. Post processing will take place at the home laboratory by auto- plating of Po isotopes onto silver disks on a 1 M HCl solution. Po isotopes emissions are finally measured by alpha spectrometry. Isotope ingrowth and decay corrections are applied to calculate the ²¹⁰Pb activities