Research on iron speciation in surface sediments in intertidal zone of Yantai Sishili bay

To provide a theoretical basis for iron pollution in sediment, iron speciation in the sediments from the intertidal zone of Yantai Sishili bay was studied in this paper.Contents of exchangeable, carbonate, Fe-Mn oxide, organic and residual iron in surface sediments were analyzed by Tessier sequential extraction procedure.Distribution and correlation of total iron and different iron speciation in surface sediments were discussed in detail.The results showed that the contents of iron in different sampling sites had no significant difference.The iron speciation was dominated by residual iron with percentage of 56.43%~85.92%, while the percentage of bio-available fraction iron was 14.08%~43.57%.Correlation analysis showed that the content of total iron was mainly controlled by residual iron.Correlation between exchangeable iron and other iron forms as well as total iron reflected the migration of iron between water and sediment.