DETERMINATION OF BERYLLIUM(II) ON SOLID SUBSTRATES BY PHOTOTHERMAL SPECTROMETRY AFTER SELECTIVE COMPLEXATION WITH CHROME AZUROL-S

Chrome Azurol S (CAS) has been used as a chromogenic reagent in the de sign of specific reagent strips for the determination by photothermal spectrometry (PTS) of beryllium(II) in aqueous samples collected on a membrane filter. This reagent must be carefully formulated for compati bility, stability, reaction speed, sensitivity and freedom from interf erences. A linear relationship existed between PTS signal amplitude an d Be(II) concentration for the concentration range of 0.1-15 mug g-1. The potential of this method for long-term sample storage is important in practical applications where the samples cannot be analyzed for Be (II) immediately after their collection on membrane filters in the fie ld.