Dispersive Liquid-liquid microextraction for cadmium determination in atmospheric particulate matter

GARRIDO, MARIANO; VEGA, MARIANA; DOMINI, CLAUDIA E.; SAMUELSEN LUCEA, CLAUS; PEREYRA, MARCELO T.

Mendoza

Simposio; 15th Rio Symposium on Atomic Spectrometry; 2019

Universidad Nacional de Cuyo. Asociación Argentina de Quimica Analitica. Comision Nacional de Energia Atomica. Conicet.

Detection and concentration assessment of trace metals and metalloids in environmental samples is a challenge that often requires the development of more sensitive and reliable analytical methods. Among the potentially toxic elements, cadmium represents a pollutant of concern that was detected, at trace levels, in many environmental matrices of Bahia Blanca region (e.g. urban wastewater, estuarine bivalves, sediments and water, fine soil fractions, and urban road dust)1,2. In the current study a new dispersive liquid-liquid microextraction (DLLME) technique was developed for the preconcentration of Cd and further determination of this metal in atmospheric particulate matter by atomic absorption spectrometry. A Plackett-Burman experimental design was applied to evaluate the effects of the independent parameters affecting the extraction efficiency (pH, salinity, volume of dispersive and extractant solvents, chelating agent concentration (8-hidroxyquinoline), time of extraction and complexation reaction time). The only significant negative effect corresponded to the salinity. Under the conditions that maximize the analytical signal, the established method showed a satisfactory performance, with and acceptable intermediate precision (relative standard deviation (RSD) = 13 %, n =3) and good recoveries (about 97%). The method was applied to different samples (PM10 and road dust).