Chrome Azurol S (CAS) has been used as a chromogenic reagent in the design 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 compatibility, stability, reaction speed, sensitivity and freedom from interferences. A linear relationship existed between PTS signal amplitude and Be(II) concentration for the concentration range of 0.1-15 μg 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 field.

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Keywords Beryllium, Chrome Azurol S, Complexation, Photothermal spectrometry, UV-Visible spectrophotometry
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Journal Analytica Chimica Acta
Lai, E. P, Statham, B.D. (Brian D.), & Ansell, K. (Kathleen). (1993). Determination of beryllium(II) on solid substrates by photothermal spectrometry after selective complexation with Chrome Azurol S. Analytica Chimica Acta, 276(2), 393–399. doi:10.1016/0003-2670(93)80410-M