DISTRIBUTION OF HEAVY METALS IN NATUNA COASTAL WATERS
<p><strong><em>ABSTRACT</em></strong></p><p><em>The</em><em> study of Pb, Cd, Cu, Hg, and As and Fe in Natuna coastal waters, Riau Islands was conducted in November 2012. Water and sediment samples were collected from 35 stations by purposive sampling method</em><em> and those heavy metals were</em><em> analysed using Atomic Absorption Spectrophotometer, flame type (FAAS). The results showed that concentrations of total Pb, Cd, Cu, Hg, and As in surface water were below instrument</em><em> </em><em>detection limit</em><em> </em><em>(</em><em>2 µg/L for Pb</em><em>,</em><em> Cd</em><em>, and Cu;</em><em> 0.02 µg/L for Hg and As</em><em>)</em><em>.</em><em> </em><em>Moreover</em><em>, the concentration of metal Fe in surface water was 0.021-0.054 mg/L. Concentrations of Pb and Cu in sediment were 0.05-22.67 mg/kg and 3.77-11.00 mg/kg, respectively, at which the highest concentrations were found near Binjai Estuary.</em><em> </em><em>T</em><em>hose concentrations were significantly below the standard levels set by CCME (2002) and ANZECC/ARMCANZ (2000).</em><em> </em><em>C</em><em>oncentration of Fe in sediment </em><em>varied from</em><em> 751.13-2309.12 mg/kg and showed similar </em><em>spatial </em><em>distribution to Cu-in-sediment. No standard level for Fe in waters was </em><em>available</em><em>. Generally, it can be concluded that Natuna coastal water was still</em><em> uncontaminated</em><em>. </em></p><p> </p><strong><em>Keywords</em></strong><em>: heavy metals, iron metal, Natuna coastal waters.</em>