Two spectrofluorimetric methods, second-derivative
constant-energy synchronous luminescence (SDCESL) and constant-wavelength
synchronous luminescence (CWSL) in combination with multiple linear
regression (MLR), for the quantification of benzo[a]pyrene (BaP)
at sub-ng mL−1 levels, in the presence of
benzo[b]fluoranthene (BbFt), benzo[k]fluoranthene (BkFt),
benzo[ghi]perylene (BghiP) and indeno[1,2,3-cd]pyrene
(IP), were developed and compared in detail. SDCESL presents lower limits
of detection and quantification than CWSL/MLR and also gives more exact and
precise results for levels close to the quantification limit. For BaP,
SDCESL achieved quantification limits of 0.019 ng mL−1 in
river waters and 0.007 ng mL−1 in drinking waters. This
work offers a sensitive, precise, accurate, rapid, simple and economic
methodology for monitoring BaP in waters for public consumption, meeting
all the requirements of the EC Directive 98/83/CE that fixes the maximum
admissible limit for this polycyclic aromatic hydrocarbon in drinking
waters at of 0.010 ng mL−1.
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