The guidelines developed by MacDonald indicated
that all samples for As exceeded a threshold effect concentration (TEC,
below which adverse effects are not expected to occur), and 4% to 30%
of the sediment samples for Cr, Zn, Ni, Pb and Cu exceeded the TEC,
which demonstrated that adverse toxic impact to benthic organisms
might be expected. However, no sample exceeded the TEC for Cd
The guidelines developed by MacDonald indicatedthat all samples for As exceeded a threshold effect concentration (TEC,below which adverse effects are not expected to occur), and 4% to 30%of the sediment samples for Cr, Zn, Ni, Pb and Cu exceeded the TEC,which demonstrated that adverse toxic impact to benthic organismsmight be expected. However, no sample exceeded the TEC for Cd
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