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Abstract
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In solid-phase extraction, the sorbent controls
selectivity, affinity, and loading capacity. Many sorbents
can be used, such as functionalized resin, naphthalene,
activated carbon, molecular-imprinted polymers, and
nanometer-sized materials. Here, we prepared a
nanocomposite made of graphene quantum dots and eggshell
to extract polycyclic aromatic hydrocarbons from
aqueous solutions. We studied the effect of sample volume,
solution pH, amount of nanosorbent, and sample loading
flow rate on the extraction efficiency. We obtained a wide
dynamic linear range from 0.1 to 200 ng m/L, good linearity
with r2 higher than 0.99, and low-detection limits of
5–75 pg m/L. We measured PAH in spiked water samples.
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