Direct determination of Ge in hot spring waters and coal fly ash samples by hydride generation-ETAAS.
A method for Ge determination in hot spring water and acid extracts from coal fly ash samples involving hydride generation, trapping and atomisation of the hydride generated from Ir-treated graphite tubes (GTs) has been developed. Hydride was generated from hydrochloric acid medium using sodium tetrahydroborate. Several factors affecting the hydride generation, transport, trapping and atomisation efficiency were studied by using a Plackett-Burman design. Results obtained from Plackett-Burman designs suggest that trapping and atomisation temperatures are the significant factors involved on the procedure. The accuracy was studied using NIST-1633a (coal fly ash) reference material. The detection limit of the proposed method was 2.4mugl(-1) and the characteristic mass of 233pg was achieved. The Ge concentrations in fly ash and hot spring samples were between 6.25-132mugg(-1) and 12.84-36.2mugl(-1).
Moscoso-Pérez
Carmen
C
Department of Analytical Chemistry, Faculty of Sciences, University of A Coruña, Campus da Zapateira, s/n. E-15071, A Coruña, Spain.
Moreda-Piñeiro
Jorge
J
López-Mahía
Purificación
P
Muniategui-Lorenzo
Soledad
S
Fernández-Fernández
Esther
E
Prada-Rodríguez
Darío
D