THESIS APPROVAL

ioaccumulation test, respectively (Figure 32) with the mean value of 12.26±7.59
µg/g dwt.
The results of the study clearly showed that the overlying water above the
sediment in the treatment contained naphthalene after the experiment start. The
concentrations gradually increased over the course of the test period, ranging from
3.39±0.24 to 10.55±0.09 µg/ml in 24 to 96 h of the exposure, respectively (Figure 33)
with the average value of 6.55±2.84 µg/ml.
Figure 34 depicted accumulation of naphthalene from laboratory-exposed
oligochaetes. Following the 96 h exposure, worms significantly bioaccumulated
naphthalene in direct proportion to the sediment concentrations to which they were
exposed (r = 0.98). Tissue residues of naphthalene in worms varied among the
exposure periods, ranging from 1749.72±66.98 to 264.11±3.02 µg/g dwt in the 24 to
96 h exposure, respectively. It was found that the concentration reached a maximum
after 24 h of the exposure and decreased thereafter through the end of the experiment.
The bioaccumulation was found to be significantly decreased with increasing
exposure time (p