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Anal Bioanal Chem. 2011 Jan;399(3):1389-92. doi: 10.1007/s00216-010-4432-y. Epub 2010 Nov 25.

Synthesis of hydrochloric acid solution for total mercury determination in natural waters.

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Laboratoire PROTEE (Processus de Transferts et d'Echanges dans l'Environnement), Equipe CAPTE, Université du Sud Toulon-Var, BP 20132, 83957 La Garde cedex, France.


Total mercury (Hg(T)) determination requires the addition of concentrated hydrochloric acid solution (≥10 mol L(-1) HCl) in relatively high amounts to preserve the samples and to prepare reagent solutions. A method for the preparation of concentrated HCl with Hg(T) concentration of lower than 5 ng L(-1) is described in this article. It is based on the well-known chemical reaction: 2 NH(4)Cl + H(2)SO(4) → (NH(4))(2)SO(4) + 2 HCl. This method is validated thanks to the US Environmental Protection Agency method 1631 and standard reference materials BCR-579 (mercury in coastal seawater).

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