Consulta: creatorFacets:"Patel-sorrentino, Nathalie"
Registros recuperados: 2
Data/hora: 13/06/2024 01:14:06

A Michaelis–Menten type equation for describing methylmercury dependence on inorganic mercury in aquatic sediments
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Cossa, Daniel; Garnier, Cedric; Buscail, Roselyne; Elbaz-poulichet, Francoise; Mikac, Nevenka; Patel-sorrentino, Nathalie; Tessier, Erwan; Rigaud, Sylvain; Lenoble, Veronique; Gobeil, Charles.
Methylation of mercury (Hg) is the crucial process that controls Hg biomagnification along the aquatic food chains. Aquatic sediments are of particular interest because they constitute an essential reservoir where inorganic divalent Hg (HgII) is methylated. Methylmercury (MeHg) concentrations in sediments mainly result from the balance between methylation and demethylation reactions, two opposite natural processes primarily mediated by aquatic microorganisms. Thus, Hg availability and the activity of methylating microbial communities control the MeHg abundance in sediments. Consistently, some studies have reported a significant positive correlation between MeHg and HgII or total Hg (HgT), taken as a proxy for HgII, in aquatic sediments using...
Tipo: Text
Palavras-chave: Mercury; Methylmercury; Aquatic sediment; Methylation; Demethylation.
Ano: 2014
URL: http://archimer.ifremer.fr/doc/00171/28220/26520.pdf

Synthesis of hydrochloric acid solution for total mercury determination in natural waters
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Patel-sorrentino, Nathalie; Benaim, Jean-yves; Cossa, Daniel; Lucas, Yves.
Total mercury (Hg-T) determination requires the addition of concentrated hydrochloric acid solution (&gt;= 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 -&gt;(NH4)(2)SO4+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).
Tipo: Text
Palavras-chave: Synthesis; Hydrochloric acid; Mercury determination; Green analytical chemistry.
Ano: 2011
URL: http://archimer.ifremer.fr/doc/00029/14071/11390.pdf