Distribution of dissolved heavy metals Hg, Pb, Cd, and As in Bojonegara Coastal Waters, Banten Bay

Heavy metals in the waters come from many sources such as anthropogenic activities and could significantly impact the environment. This study aimed to determine the distribution of dissolved heavy metals of Hg, Pb, Cd, and As in the coastal waters of Bojonegara. Sampling was conducted from October to December 2019 at six stations. Data analysis consisted of distribution of heavy metals, heavy metal correlation with water quality, and comparison of actual heavy metals concentration to heavy metals quality standard concentration. Based on results, the concentrations of Hg, Pb, Cd, and As at six stations were below the detection limit, except Pb in November. The high Pb concentration was found the most in the river area and the concentration getting lower towards the sea. Based on correlation analysis results, heavy metals concentration is influenced by temperature, salinity, pH, and DO. According to Ministerial Decree of Environment No. 51 of 2004 concerning seawater quality standards for biota, the concentration of Hg, Pb, Cd, and As in coastal waters of Bojonegara still in good condition for aquatic life.