TXRF analysis of river waters in its stream across the city of Córdoba in Argentina

MARÍA CECILIA VALENTINUZZI; HÉCTOR JORGE SÁNCHEZ; JOSÉ ABRAHAM

Spectrochimica Acta Part B: Atomic Spectroscopy

Año: 2006 vol. 61 p. 1175 - 1179

The aim of this work was to analyze the composition of river waters and to study their quality by detecting possible contaminants. The samples were taken at 32 points of the Suquía River in its stream across the city of Córdoba (in the Province of Córdoba, Argentina). The samples were analyzed with total reflection X-ray fluorescence (TXRF) using beam guides. Beam guides made of two Si plate reflectors were used as sample carriers and to guide the X-ray photons to the sample; the measurements were taken using the characteristic configuration that ensures the best excitation and detection conditions (in TXRF). The analyses were carried out by pre-concentration of the water samples and by adding an internal standard (Gallium); small amounts of samples (30 ml) were deposited on the Si reflector plate and they were then analyzed in the total reflection regime. Spectra were analyzed with standard methods using conventional programs. The results show interesting behaviors of the concentration of trace elements along the river: elements of low atomic number (such as Ca, Cl, S, K) present higher concentrations as compared to high Z elements (such as Fe, Zn, Br, Sr); the concentrations of light elements follow a similar behavior along the stream, the same situation is observed the set of elements with high atomic number. Some samples present high concentrations in certain elements indicating possible sources of contamination.