Development of a method for multielemental determination in water by EDXRF with radioisotopic source of 238Pu.

Camilo Fuentes Serrano; Juan Reinaldo Estevez Alvares; Alfredo Montero Alvarez; Ivan Pupo Gonzales; Zahily Herrero Fernandez; Dennys Leyva Bombuse; Piet Van Espen; Jossue Arteche Diaz; Lino Valcarcel Rojas; Jose Araujo Dos Santos Júnior

doi:10.15392/bjrs.v7i2A.627

Authors

Camilo Fuentes Serrano Center of Technological Applications and Nuclear Development
Juan Reinaldo Estevez Alvares Center of Technological Applications and Nuclear Development
Alfredo Montero Alvarez Center of Technological Applications and Nuclear Development
Ivan Pupo Gonzales Center of Technological Applications and Nuclear Development
Zahily Herrero Fernandez Center of Technological Applications and Nuclear Development
Dennys Leyva Bombuse Center of Technological Applications and Nuclear Development
Piet Van Espen University of Antwerp
Jossue Arteche Diaz Center of Technological Applications and Nuclear Development
Lino Valcarcel Rojas Center of Technological Applications and Nuclear Development
Jose Araujo Dos Santos Júnior Federal University of Pernambuco

DOI:

https://doi.org/10.15392/bjrs.v7i2A.627

Keywords:

multielemental determination, EDXRF, water

Abstract

A method for determination of Cr, Fe, Co, Ni, Cu, Zn, Hg and Pb in waters by Energy Dispersive X Ray Fluorescence (EDXRF) was implemented, using a radioisotopic source of ²³⁸Pu. For previous concentration was employed a procedure including a coprecipitation step with ammonium pyrrolidinedithiocarbamate (APDC) as quelant agent, the separation of the phases by filtration, the measurement of filter by EDXRF and quantification by a thin layer absolute method. Sensitivity curves for K and L lines were obtained respectively. The sensitivity for most elements was greater by an order of magnitude in the case of measurement with a source of ²³⁸Pu instead of ¹⁰⁹Cd, which means a considerable decrease in measurement times. The influence of the concentration in the precipitation efficiency was evaluated for each element. In all cases the recoveries are close to 100%, for this reason it can be affirmed that the method of determination of the studied elements is quantitative. Metrological parameters of the method such as trueness, precision, detection limit and uncertainty were calculated. A procedure to calculate the uncertainty of the method was elaborated; the most significant source of uncertainty for the thin layer EDXRF method is associated with the determination of instrumental sensitivities. The error associated with the determination, expressed as expanded uncertainty (in %), varied from 15.4% for low element concentrations (2.5-5 μg/L) to 5.4% for the higher concentration range (20-25 μg/L).

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