11th Rio Symposium on atomic spectrometry

LUIS A. ESCUDERO; A.J. BLANCHET; J.A. SALONIA; J. A. GASQUEZ

Mar del Plata

Simposio; 11th Rio Symposium on atomic spectrometry; 2010

Nickel is an element that often is found in water as is used in a number of industrial processes. The intake in higher concentrations than permitted, it can cause damage to lungs, kidneys, gastrointestinal problems, pulmonary fibrosis, and   skin dermatitis, etc[1]. Because of these problems, your level of trace element determination [2] is important. It is known that the use of different digestion methods in determining trace elements in sediments can lead to mixed results and, consequently, other environmental considerations. The digestion methods generally provide information on the total content of trace elements in sediment without discriminating for the contribution and the level of anthropogenic pollution [3]. One of the most common techniques for the determination of Ni is the flame atomic absorption spectrometry (FAAS), but when the Ni content is not compatible with detection limits of this technique is to apply a preconcentration methodology.In this work, we developed a methodology for the preconcentration of Ni on-line and detection by FAAS. The digestion of the sediment was carried out by simple extraction using 1M HCl and  total digestion to compare . For the preconcentration of the analyte is a minicolumn filled with  etilvinil acetate (EVA). The performace analytical obtained by applying this methodology were: enrichment factor (EF) of 46 times for a preconcentration time of 120 s. The limit of detection (LOD) was 3.78 µg L-1, the precision for six replicate determinations at 20 μg L−1 Ni concentration was 4,38% relative standard deviation. The sampling frequency for the proposed system was about 20 samples/h. The optimized procedure was applied to the determination of Ni in natural water samples and sediments of lakes.