Abstract
Sediments of Porong River estuary suspected of containing a high concentration of heavy metals. the Sediment sample was collected from Porong Estuary river at two different location. The purposes of this study to determine the distribution concentration of metals geochemical fraction (Cd, Pb and Zn) at sediment Porong River estuary and correlation Against Physico-chemical properties of sediments. Analysis of sediment includes determining the concentration of Cd, Pb and Zn and determining of physicochemical properties of sediments such as pH, salinity, redox potential, cation exchange capacity, organic materials and sediment particles size. Extraction Method performed by BCR (Community Bureau of Reference) three steps sequential extraction, where a geochemical fraction of metals divided to 4 fractions, such acid soluble, reducible, oxidized and residual fractions. Research showed Zn has the highest concentration of each fraction and followed by Pb and Cd. Concentration of Zn in Fraction 1-4 ranged from 31,909 – 84,966 mg/Kg, Pb concentrations range 3,354 – 18,956 mg/Kg, whereas Cd concentrations range between 0,221 – 0,611 mg/Kg. The order of metals geochemical fraction concentration at Fraction 1, 2, 3 and 4 is Zn>Pb>Cd. There is some correlation between metals concentration against physicochemical properties of sediment. Where the physicochemical properties of sediment influence heavy metal content and concentration in the sediment of Porong River Sidoarjo.
Highlights
Sediments of Porong River estuary suspected of containing a high concentration of heavy metals
the Sediment sample was collected from Porong Estuary river at two different location
Analysis of sediment includes determining the concentration of Cd
Summary
Residu dari fraksi 1 dikeringkan dengan oven pada suhu 105°C selama 2 jam kemudian ditimbang dan dicatat beratnya, selanjutnya ditambahkan dengan 40 mL hidroksilamin hidroklorida (NH2OH.HCl) 0,5 M (diatur pH menjadi 1,5 dengan penambahan HNO3), kemudian dikocok menggunakan shaker dengan kecepatan 200 rpm selama 16 jam kemudian disentrifugasi dengan kecepatan 4000 rpm selama 15 menit. Filtrat dianalisis dengan AAS dan Residu yang diperoleh digunakan untuk analisis pada langkah selanjutnya
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