TY JOUR TI TO THE QUESTION OF ACCUMULATION OF HEAVY METALS (Pb, Hg, As) IN THE COMPONENTS OF AQUATIC ECOSYSTEMS OF ESTUARINE AREA OF THE RED RIVER (VIETNAM) KW heavy metals KW enrichment coefficients of heavy metals KW bottom sediments KW mollusks Meretrix lyrata KW bioaccumulation JO Vestnik of Astrakhan State Technical University. Series: Fishing industry AU Volkova, I.. AU Nguyen, T.. PY 2018 IS PB Astrakhan State Technical University