A PVC membrane electrode for beryllium(II) ions based
on benzo-9-crown-3 as membrane carrier was prepared.
The sensor exhibits a Nernstian response for Be2+ ions
over a wide concentration range (4.0 × 10-3−2.5 × 10-6
M) with a limit of detection of 1.0 × 10-6 M (9.0 × 10-3
ppm). It has a response time of ∼50 s and can be used
for at least 4 months without any divergence in potential.
The proposed electrode revealed very good selectivities
for Be2+ over a wide variety of other cations including
alkali, alkaline earth, transition, and heavy metal ions and
could be used in a pH range of 2.0−6.0. It was successfully applied to the determination of beryllium in a mineral
sample.
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