Total concentrations of 15 metal elements in the surface sediments of Yundang Lagoon in Xiamen were determined using ICP-MS. The fractions were extracted by a modified BCR method. The results indicated that in different areas of Yundang Lagoon, the order of the concentrations of Cd, Cu, Sr, Pb, Zn and U was:outer lagoon > ditch > inner lagoon, the order for Cr, Co, Ni, V, Fe, Li, Rb and Mn was:inner lake > outer lake > ditch. Cu, Zn and Pb were mainly in the reducible phase; Cd was mainly in the acid soluble-extractable and reducible phases; Co, Ni, U, Fe and Mn were mainly in the reducible and residual phases; Li, V, Cr, Rb and Ba were dominated by residual phase. The potential ecological risk of metal elements suggested that V, Cr, Co, Ni, Zn, Cu, Cd and Pb were at a low potential ecological risk level. The results of ratio of secondary phase to primary phase (RSP) assessment indicated that Cu, Cd and Zn showed high pollution level; Pb showed moderate pollution level; Co, Mn, Sr and U were in a low polluted condition; Ni, Fe, Cr, V, Li, Ba and Rb showed no pollution. In general, Yundang Lagoon was in a low potential ecological risk.
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