bioconcentratemetalsintotheirtissues(Li etal.,2009). Duetotheir
wide geographicaldistribution,theirhighabundanceinthebenthic
environmentandsedentarynature(Blackmore,1999),molluskscan
be usedasbiomonitorsindicatingthebioavailabilityofcontami-
nantsandthedegreeofpollution(Peerzada andKozlik,1992;
Schuhmacher,1996). Theassessmentoftoxicity ofsediments
generallyrequiresapplicationofatleastasinglesuitablebiological
test togetherwithchemicalanalysis(Mazurova´ et al.,2008).
bioconcentratemetalsintotheirtissues ( หลี่ คณะ , 2009 ) duetotheirgeographicaldistribution theirhighabundanceinthebenthic กว้าง ,environmentandsedentarynature ( Blackmore , 1999 ) molluskscanเป็น usedasbiomonitorsindicatingthebioavailabilityofcontami -nantsandthedegreeofpollution ( peerzada andkozlik , 1992 ;schuhmacher , 1996 ) theassessmentoftoxicity ofsedimentsgenerallyrequiresapplicationofatleastasinglesuitablebiologicalทดสอบ togetherwithchemicalanalysis ( mazurova ใหม่ et al . , 2008 )
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