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5134858 
Journal Article 
Assimilation efficiency for sediment-sorbed benzo(a)pyrene by Diporeia spp 
Lydy, MJ; Landrum, PF 
1993 
Yes 
Aquatic Toxicology
ISSN: 0166-445X
EISSN: 1879-1514 
26 
3-4 
209-223 
English 
WOS:A1993LT01100005 
BIOSIS COPYRIGHT: BIOL ABS. Two methods are currently available for determining contaminant assimilation efficiencies (AE) from ingested material in benthic invertebrates. These methods were compared using the Great Lakes amphipod Diporeia spp. and (14C)benzo(a)pyrene (BaP) sorbed to Florissant sediment ( and lt; 63 mum). The first approach, the direct measurement method, uses total organic carbon as a tracer and yielded AE values ranging from 45.9-60.4%. The second approach, the dual-labeled method, uses 51Cr as a non-assimilated tracer and did not yield AE values for our data. The inability of the dual-labeled approach to estimate AEs was due, in part, to the selective feeding by Diporeia resulting in a failure of the non-assimilated tracer (51Cr) to track with the assimilated tracer ((14C)BaP). The failure of the dual-labeled approach was not a result of an uneven distribution of the labels among particle size classes, but more likely resulted from differential sorption of the two isotopically lab 
ASSIMILATION EFFICIENCY; SEDIMENT; BAP; DIPOREIA; DIRECT MEASUREMENT METHOD; DUAL-LABELED METHOD