Chronopotentiometric stripping analysis using gold electrodes, an efficient technique for mercury quantification in natural waters


Autoria(s): Augelli, M. A.; Munoz, RAA; Richter, E. M.; Gouveia, A.; Angnes, L.
Contribuinte(s)

Universidade Estadual Paulista (UNESP)

Data(s)

20/05/2014

20/05/2014

01/05/2005

Resumo

This paper proposes a simple methodology for mercury quantification in natural water by stripping chronopotentiometry at constant current, using gold (film) electrodes constructed from recordable CDs in stationary cell. The proposed method allows the direct measurement of labile mercury in natural waters. To quantify total mercury, a robust and low cost UV irradiation system was developed for the degradation of organic constituents of water. The proposed system presents such advantages as excellent sensitivity, low cost, versatility, and smaller dimensions (portability for on-field applications) when compared with other techniques (ICP, GFAAS, fluorimetry) traditionally utilized for mercury quantification. A large linear region of responses was observed, situated over the range 0.02 - 200 μ g L-1. Various experimental parameters were optimized and the system allowed quantifications in natural samples, with detection limit of 8 ng L-1 and excellent reproducibility (RSD of 1.4% for 48 repetitive measurements using a 10 μ g L-1 mercury solution). Different metal ions were evaluated, including copper, as possible interferences on stripping mercury signals. Applications of the new method were demonstrated for the analysis of certified and groundwater samples spiked with a known amount of mercury and for the quantification of methylmercury in synthetic oceanic water, originally utilized for fishes contamination experiment.

Formato

755-761

Identificador

http://dx.doi.org/10.1002/elan.200403156

Electroanalysis. Weinheim: Wiley-v C H Verlag Gmbh, v. 17, n. 9, p. 755-761, 2005.

1040-0397

http://hdl.handle.net/11449/37308

10.1002/elan.200403156

WOS:000229167600005

Idioma(s)

eng

Publicador

Wiley-Blackwell

Relação

Electroanalysis

Direitos

closedAccess

Palavras-Chave #mercury #chronopotentiometry #stripping analysis #gold electrodes #CDtrodes #groundwater #methylmercury #UV degradation
Tipo

info:eu-repo/semantics/article