DISPERSIVE LIQUID-LIQUID MICROEXTRACTION FOR CADMIUM DETERMINATION IN ATMOSPHERIC PARTICULATE MATTER

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

Mendoza

Congreso; 15th Rio Symposium on Atomic Spectrometry; 2019

Detection and concentration assessment of trace metals and metalloids in environmentalsamples is a challenge that often requires the development of more sensitive and reliableanalytical methods. Among the potentially toxic elements, cadmium represents a pollutantof 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 soilfractions, and urban road dust) 1,2 . In the current study a new dispersive liquid-liquidmicroextraction (DLLME) technique was developed for the preconcentration of Cd andfurther determination of this metal in atmospheric particulate matter by atomic absorptionspectrometry. A Plackett-Burman experimental design was applied to evaluate the effectsof the independent parameters affecting the extraction efficiency (pH, salinity, volume ofdispersive and extractant solvents, chelating agent concentration (8-hidroxyquinoline),time of extraction and complexation reaction time). The only significant negative effectcorresponded to the salinity. Under the conditions that maximize the analytical signal, theestablished method showed a satisfactory performance, with and acceptable intermediateprecision (relative standard deviation (RSD) = 13 %, n =3) and good recoveries (about97%). The method was applied to different samples (PM 10 and road dust).