Fraction distribution of cadmium in surface sediment collected from bivalve species harvesting areas in Binh Thuan province (Tuy Phong, Phan Thiet, Lagi)

This paper aims to provide information about the fractions of cadmium (Cd) and its distribution in surface sediment collected from bivalves harvesting areas Binh Thuan province (Tuy Phong, Phan Thiet, Lagi). For this purpose, samples were monthly along with these 2015–2016. To analyze Cd, a five-step Tessier (1979) sequential extraction process was used, including Fraction 1 (Exchangeable), 2 (Bound carbonate), 3 iron-manganese oxide), 4 organic compounds), 5 (Residual). The research showed that Cd concentrations contributed mainly strong association residual fraction (Fraction 5). However, percentage total (high mobility bioavailability fractions) all also relatively high. In Tuy Phong Lagi areas, follows trend F5 > F2 F3 F4 F1, while present Thiet area F1 F4. Fractions F4, indicated weak positive correlation concentration medium correlations, respectively. According Risk Assessment Code (RAC), results reveal poses high environmental risk area.