Add time:07/30/2019         Source:sciencedirect.com

This communication reports the development of an analytical method for the measurement of low-levels of lead-210 in natural waters via measurement of the beta activity of its in-grown BISMUTH-210 (cas 14331-79-4) daughter. The analysis essentially consists of three stages. (a) Pre-concentration of the lead-210 in a known volume of water by co-precipitation with a mixed barium/lead sulphate, where the efficiency of the step is determined by gamma measurement of a barium-133 internal tracer. (b) Separation of the in-grown bismuth-210 from its lead-210 parent by solvent extraction of a bismuth carrier into a solution of diethylammonium diethyldithiocarbamate (DDTC) in chloroform. (c) Preparation of a bismuth oxychloride source for gross beta counting to determine the bismuth-210 activity. The reported method is capable of achieving a detection limit (4σ b) of < 10 mBq/l.

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