The obtained results suggested that for the washing step
water is the more suitable solvent, as it has enough solvent
power to remove weakly absorbed interferents without
removing the strongly absorbed analytes. Washing solutions
containing methanol led to substantial losses and greatly
decreased 1-hydroxynaphthalene, 2-hydroxyfluorene, and 1-
hydroxypyrene recoveries, from 87, 68, and 75%, respectively,
to 66, 40, and 22%, respectively