Dissolved Pb and Cd Distribution in Cengkok Nearshore of Banten Bay, Indonesia: Processes and Mechanisms

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The onshore of Banten Bay has been an active zone with settlements, industries, and ports that potentially release heavy-metal containing waste. This study aims to explain the extent to which Pb and Cd may disperse in the Cengkok nearshore of Banten Bay, Indonesia. Water samples were collected monthly from April to September 2019. Analysis of dissolved heavy metals followed the APHA 2012 procedure. The water quality conditions of the Cengkok nearshore varied during the study period. The distribution of dissolved Pb and Cd in April, June, July, and August are generally undetected although they were found in May ranging <0.002 - 0.011 mg/L Cd and <0.002 - 0.008 mg/L Pb. In September, Cd and Pb were found at all locations varying 0.007 - 0.014 mg/L and 0.004 - 0.042 mg/L, respectively. Cd and Pb distribution patterns varied and could indicate both the riverine effect and coastal processes. Cd and Pb were found discontinuously and disperse differently, indicating the effect of monthly seasons and coastal dynamics.