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Article Dans Une Revue Limnology and Oceanography: Methods Année : 2012

Intercalibration studies of Po-210 and Pb-210 in dissolved and particulate seawater samples

Thomas Church
  • Fonction : Auteur
Sylvain Rigaud
Mark Baskaran
  • Fonction : Auteur
Anupam Kumar
  • Fonction : Auteur
Jana Friedrich
  • Fonction : Auteur
Pere Masque
  • Fonction : Auteur
Viena Puigcorbe
  • Fonction : Auteur
Guebuem Kim
  • Fonction : Auteur
Gi Hong
  • Fonction : Auteur
Hiu Choi
  • Fonction : Auteur
Gillian Stewart
  • Fonction : Auteur

Résumé

Documented is an intercalibration (IC) exercise for both Po-210 and Pb-210 in seawater aliquots distributed between up to eight international laboratories that followed individual protocols. Dissolved and particulate samples were provided by GEOTRACES during two IC cruises at baseline stations in the North Atlantic and North Pacific oceans. Included were surface and/or deep dissolved and particulate samples at each site, plus complete profiles analyzed by the laboratory of the lead author. An unspecified solid phase standard was also distributed with Po-210 and Pb-210 in secular equilibrium to confirm spike calibrations. The Po-210 activities reported n = 8) for the standard were very similar with a relative standard deviation (RSD) of 3.6% and mean value indistinguishable from the certified value, confirming accurate calibration of Po spikes. For seawater samples, the agreement was strongly dependent for both nuclides on the activity of the samples. The agreement was relatively good for dissolved seawater samples (RSD = 9% to 29%, n = 4), moderate for the particulate samples (RSD = 12% to 80%, n = 8), and poor for particulate dip blanks (RSD = 50% to 200%, n = 8). Noted is the higher apparent affinity of Po-210 versus Pb-210 for polysulphone filter material. Some lack of reproducibility between labs may have been caused by unspecified differences in individual lab protocols and calculations. A minimum sample activity of 0.1 dpm for both nuclides is recommended for an adequate reproducible sample activity. It is suggested that a consistent set of procedures and calculations be used to optimize future Po-210 and Pb-210 analyses in seawater samples.

Dates et versions

hal-01061553 , version 1 (08-09-2014)

Identifiants

Citer

Thomas Church, Sylvain Rigaud, Mark Baskaran, Anupam Kumar, Jana Friedrich, et al.. Intercalibration studies of Po-210 and Pb-210 in dissolved and particulate seawater samples. Limnology and Oceanography: Methods, 2012, 10, pp.776-789. ⟨10.4319/lom.2012.10.776⟩. ⟨hal-01061553⟩
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