Analysis of Pb-210 in water samples with plastic scintillation resins

作者：Lluch E; Barrera J; Tarancon A^*; Bagan H; Garcia J F

来源：Analytica Chimica Acta, 2016, 940: 38-45.

DOI：10.1016/j.aca.2016.08.004

• Pb-210
• Scintillation
• Crown ethers
• Water
• PSresin

Pb-210 is a radioactive lead isotope present in the environment as member of the U-238 decay chain. Since it is a relatively long-lived radionuclide (T-1/2 = 22.2 years), its analysis is of interest in radiation protection and the geochronology of sediments and artwork. Here, we present a method for analysing Pb-210 using plastic scintillation resins (PSresins) packaged in solid-phase extraction columns (SPE cartridge). The advantages of this method are its selectivity, the low limit of detection, as well as reductions in the amount of time and reagents required for analysis and the quantity of waste generated. The PSresins used in this study were composed of a selective extractant (4',4 ''(5 '')-Di-tert-butyldicyclohexano-18-crown-6 in 1-octanol) covering the surface of plastic scintillation microspheres. Once the amount of extractant (1:1/4) and medium of separation (2 M HNO3) were optimised, PSresins in SPE cartridges were calibrated with a standard solution of Pb-210. Pb-210 could be fully separated from its daughters, Bi-210 and Po-210, with a recovery value of 91(3)% and detection efficiency of 44(3)%. Three spiked water samples (one underground and two river water samples) were analysed in triplicates with deviations lower than 10%, demonstrating the validity of the PS resin method for Pb-210 analysis.

• 出版日期2016-10