The surrogate recovery standards were 2,4,5,6-tetrachloro-m-xylene and deca-
chlorobiphenyl. Prior to extraction, samples were spiked with surrogate standards. Surrogate standards in water and sediment
samples were determined with good precision. The method limit
of detection (MLD) ranged from 0.01 to 0.07 ng L ?1 for water and
SPM samples and from 0.01 to 0.06 ng g ?1 for sediment samples.