Chromatographic Method Optimization. A gradient
reversed-phase LC-FD method was developed for the
simultaneous determination of 1-hydroxynaphthalene, 2-
hydroxyfluorene, and 1-hydroxypyrene. Different chromatographic
conditions such as stationary phase, mobile phase
composition, with isocratic or gradient program, flow rate,
injection volume, temperature, and wavelength program were
optimized for the separation of the selected PAH derivatives.
According to the scientific literature, C18 LC columns are the
most employed.19,29,30 A C18 PAH column was chosen given
their specificity for the LC analysis of these molecules and, as
expected, separation and sensitivity were appropriate