The thallium content in some natural waters (lakes, rivers and drinking water) in South-West Sweden has been determined by Laser-Induced Fluorescence in a Graphite Furnace (LIF-GF). The high sensitivity of the LIF-GF technique eliminated the need for any sample pre-treatment or sample pre-concentration (except for acidification with small amounts of HNO3), thus reducing the number of sources of contamination. It was found (by the standard addition technique) that the Tl content of the samples investigated ranges from 8 ppt for drinking water up to 56 ppt for water from the Viskan river. No matrix interferences from concomitant elements in the samples could be detected with the present experimental set-up. This allowed for a calibration against matrix-free reference solutions.
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