Atomic Absorption Determination of Beryllium Traces in Natural Waters

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Abstract
Be traces in natural waters, especially in tap- and surface-water are increasingly subject to analytical control (e.g. by AAS, ICP-OES, fluorometry). In the present paper an analytical procedure is described for the atomic-absorption determination of Be in water. Be traces are quantitatively enriched on special cellulose ion-exchangers (Cellulose-Hyphan of the Riedel-de Haën AG, Hannover, G.F.R.), resp. cellulose-pyrogallol by a fast batch-technique. Dissolved matters like NaCl, Ca(II), Fd(III), humic acid or EDTA do not interfere in the separation. As radio-tracer experiments by means of Be-7 show, in this manner nanogram quantities of Be can be enriched by the factor 100-200 from tap, river- and sea-water. Flame- respectively ETA-AAS are used for the determination of the enriched Be. Within the latter several atomizer systems and different coated tubes are applied. Accompanying ions, for example Ca2+, cause partially high signal depressions. The detection limits (3σ) of the complete procedure are 50 ng/l Be (FAAS, s r, 0.02) resp. 1 ng/l (GFAAS, s r 0.09). With the developed method the Be content in natural waters including sea-water is determined.