A method for the determination of trace amounts of beryllium has been developed, based on solid-phase spectrophotometry. Beryllium reacts with Eriochrome Cyanine R in the presence of ethylenediaminetetraacetic acid t o give a highly absorbent complex, which is fixed o n a dextran-type anionexchange gel. The absorbance of the gel, at 580 and 750 nm, packed in a 1 mm cell, is measured directly. The calibration graph is linear over the concentration range 0.1-1.2 pg I-' and the relative standard deviation is 2.3%. The detection limit of the 1000 ml sample method is 6 ng I-' for 0.030 g of anion-exchange gel. The sensitivity can be enhanced by increasing the sample volume. The method has been applied t o the determination of beryllium in tap and natural waters. Keywords : Solid-p hase spectrop h o to me tr y; beryllium de te rm ina ti0 n; Erioch rom e C yanine R; water analysis Paper 3/01 716H
A method for the determination of trace amounts of aluminium based on Solid-Phase Spectrophotometry has been developed.Aluminium reacts with Eriochrome Cyanine R to give a highly coloured complex, which is fixed on a dextran type anionexchanger. The absorbance of the gel, at 590 and 750 nm, packed in a 1-mm cell, is measured directly. The calibration graph is linear in the concentration range 0.12-6.0 Fgl-' and the RSD is 1.4 %. The detection limit of the 1000-ml sample method is 20 ngl" for a 30 mg anion-exchanger. The sensitivity can be enhanced by increasing the sample volume. The method has been applied to the determination of aluminium in tap, spring and distilled water.
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