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Synthesis of hydrochloric acid solution for total mercury determination in natural waters |
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| Authors: | Nathalie Patel-Sorrentino Jean-Yves Benaim Daniel Cossa Yves Lucas |
| Institution: | 1.Laboratoire PROTEE (Processus de Transferts et d’Echanges dans l’Environnement), Equipe CAPTE,Université du Sud Toulon-Var,La Garde cedex,France;2.Ifremer, Centre de Méditerranée,La Seyne-sur-Mer,France |
| Abstract: | Total mercury (HgT) 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 HgT concentration of lower than 5 ng L−1 is described in this article. It is based on the well-known chemical reaction: 2 NH4Cl + H2SO4 → (NH4)2SO4 + 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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