Abstract
A combined method for the determination of beryllium in the nanogram range in biological matrices (e.g. urine, blood, muscle) by flameless a.a.s. is described- For a 1-ml sample of urine, the relative standard deviation decreases from 20 to 4 % for contents of 0.8 to 4.6 p.p.b. Be, and a limit of detection of 0.6 p.p.b. Be can be obtained. To avoid severe interferences from foreign ions, the sample is decomposed with nitric acid in a PTFE-tube under pressure, and beryllium is separated in the same vessel by liquid-liquid extraction of the Be(acac) 2 complex with benzene. The separated beryllium is then atomized in a graphite tube treated with a solution of ZrOCl 2. This preparation increases the beryllium signal by a factor of 3 for benzene phases and 9 for aqueous solutions. Simplification of the given procedure at any step leads to large systematic errors, which are especially high, if the urine sample is measured directly by flameless excitation.
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