INCITAP   20787
INSTITUTO DE CIENCIAS DE LA TIERRA Y AMBIENTALES DE LA PAMPA
Unidad Ejecutora - UE
congresos y reuniones científicas
Título:
MULTI-ENERGY CALIBRATION AS A NOVEL STRATEGY FOR ANIMAL FEED ELEMENTAL DETERMINATION BY ICP OES
Autor/es:
ARIANE I. BARROS; JOAQUIM NOBREGA; MARIANELA SAVIO
Lugar:
Mendoza
Reunión:
Simposio; 15th Rio Symposium on Atomic Spectrometry; 2019
Resumen:
Multiple energy calibration (MEC) is an original approach that considers the analytes capability of producing analytical signals in diverse wavelengths1,2. MEC was applied for Ca, Co, Cu, Fe, K, Mg, Mn, Na, P and Zn determination in animal feed samples by inductively coupled plasma optical emission spectrometry. Pig feed samples collected in Argentina and animal minerals supplement reference materials were microwave-assisted acid-digested, using diluted nitric acid (7 mol L-1). Contrasting with traditional calibration methods, MEC strategy was carried out using only two calibration solutions: S1, composed of 50 % v v-1 of the digested sample and 50 % v v-1 of a standard reference solution containing the analytes; and S2, composed of 50 % v v-1 of the digested sample and 50 % v v-1 of a blank solution (HNO3 0.14 mol L-1). For each analyte, the response of several wavelengths was screened in both solutions and plotted. Analyte concentration was calculated from the slope of the resulting calibration curve. The method?s accuracy was evaluated with recoveries in the 80 ? 120% range. The results were comparable and even better than the traditional external calibration. MEC outcome proved to be an efficient matrix-matching calibration method.