HEAVY METALS OF LEAD (PB) ACCUMULATION IN SEAWEED (GRACILARIA SP) CULTIVATION AND ECOSYSTEM AROUND THE INDUSTRIAL WASTE DISPOSAL RIVER

The activities of industrial waste disposal and disasters of Sidoarjo volcanic mudflow into the river give a negative impact to the surrounding aquatic ecosystems. But as a fishery center area, its activity depends on the aquatic ecosystem condition. This study aimed to evaluate the levels of lead (Pb) in seaweed (Gracilaria sp.) cultivation, sedimentation and water quality of seaweed aquaculture ponds around the river estuary, the center of industrial waste disposal.. Sample collection of seaweed, sediment and pond water were conducted using simple random sampling method. Measurement of the lead (Pb) levels in seaweed, sediment, and pond water samples used the Atomic Absorption Spectrophotometry (AAS) method. Based on the results of this study, the concentration of lead metal levels in seaweed and sediment showed the highest lead metal concentration values of 0.76 mg/kg and 0.58 mg/kg. However, the concentration of heavy metals and water quality of pound water tended to be stable with a value of <0.0764 mg / l. In conclusion, there was an increase in the lead metal concentration in seaweed cultivation and sediment of pond water in normal water quality conditions.