Speakers
Description
An inductively coupled plasma atomic emission spectrometry (ICP AES) method for determination of 21 elements (Al, As, B, Ba, Ca, Cd, Cr, Co, Cu, Fe, K, Mg, Mn, Na, Ni, P, Pb, Si, Se, V and Zn) in Rosa dumalis Bechst samples was optimized and then validated. Robust plasma conditions were reached at an radiofrequency power of 1150 W and an argon nebulizer flow of 0.5 L min-1. All experiments in axial and radial view mode were conducted under these analytical conditions. Then, standard addition curves obtained from Rosa dumalis Bechst samples spiked at different concentration levels were compared with external calibration lines established from multi-element standards to select analytical lines free from spectral interferences. The validation process was included accuracy, precision, and linearity. Standard addition method was used to assess accuracy and precision of the method. Recoveries obtained were from 89% to 107%. Correlation coefficient for calibration curves were higher than 0,999. Among the macro elements, the most abundant is K, followed by Ca, P, Mg and Na. Among the micro elements, the most abundant is Mn, followed by Si, Fe, Ba, Zn and Al. The maximum limit for Pb and Cd recommended by World Health Organization (WHO) correspond to 10 mg kg-1 and 0.3 mg kg -1, respectively. The concentrations of Pb and Cd in all the analyzed samples were lower than the maximum tolerated level permitted by WHO.
