International Journal of Environmental Research and Public Health Review Trace Elements in Marine Sediment and Organisms in the Gulf of Thailand Suwalee Worakhunpiset Department of Social and Environmental Medicine, Faculty of Tropical Medicine, Mahidol University, 420/6 Ratchavithi Rd, Bangkok 10400, Thailand;
[email protected]; Tel.: +66-2-354-9100 Received: 13 March 2018; Accepted: 13 April 2018; Published: 20 April 2018 Abstract: This review summarizes the findings from studies of trace element levels in marine sediment and organisms in the Gulf of Thailand. Spatial and temporal variations in trace element concentrations were observed. Although trace element contamination levels were low, the increased urbanization and agricultural and industrial activities may adversely affect ecosystems and human health. The periodic monitoring of marine environments is recommended in order to minimize human health risks from the consumption of contaminated marine organisms. Keywords: trace element; environment; pollution; sediment; gulf of Thailand 1. Introduction Environmental pollution is an urgent concern worldwide [1]. Pollutant contamination can exert adverse effects on ecosystems and human health [2]. Trace elements are one type of pollutant released into the environment, and metal contamination levels are rising. The main sources of trace elements are natural activities such as volcanic eruptions and soil erosion, and human activities such as industrial production, waste disposal, the discharge of contaminated wastewater, the inappropriate management of electronic waste (e-waste), and the application of fertilizers in agriculture [3–7]. Once trace elements are released into the environment, they can be dispersed by the wind and deposited in soil and bodies of water, accumulating in marine sediments [8,9].