PHYTOREMEDIATION DYNAMIC MODEL OF HEAVY METAL MERCURY (Hg) IN MANGROVE (Avicennia alba) AT WONOREJO RIVER ESTUARY

Industrial and domestic activities resulted in heavy metal contamination of heavy metals mercury (Hg) in the river that flows towards the coast of Surabaya, Indonesia. One of the pollution control efforts is phytoremediation. Phytoremediation has the advantage that it is cheaper and easier to implement. The plant used in this phytoremediation process is Avicennia alba because it can absorb and accumulate heavy metals mercury (Hg). This research was conducted at the Wonorejo Mangrove Ecoforest. Samples were taken in the form of water, sediment, roots, stems and leaves of Avicennia alba and analyzed for Hg concentration using atomic absorption spectrophotometry (AAS). The results showed that the average metal Hg in sediment at station A was 0.026 mg/kg, station B was 0.038 mg/kg and station C was 0.0003 mg/kg. The concentration of Hg in Wonorejo waters has a value range of <0.0003 mg/L to 0.099 mg/L. The average bioconcentration factor (BCF) value of mangrove Avicennia alba is 47.31. Meanwhile, Avicennia alba's translocation factor (TF) value in absorbing heavy metal Hg showed more than 1 and less than 1. This indicates that Avicennia alba carries out an extraction and translocation process. Based on the results of the dynamic system, there is a mutually influencing relationship between sediment, BCF and TF. The highest translocation ability occurs in the stem, so it can be concluded that Avicennia alba has the potential to absorb heavy metal Hg in the coastal area of Surabaya.