TY - JOUR
T1 - Heavy metals speciation in surface sediments of the Cross River Estuary, Gulf of Guinea, South East Nigeria
AU - Dan, Solomon Felix
AU - Udoh, Enobong Charles
AU - Zhou, Jiaodi
AU - Wijesiri, Buddhi
AU - Ding, Shuai
AU - Yang, Bin
AU - Lu, Dongliang
AU - Wang, Qianqian
N1 - Publisher Copyright:
© 2022 Elsevier Ltd
PY - 2022/12
Y1 - 2022/12
N2 - The speciation of heavy metals (Ni, Cr, Cu, Zn, Pb, and Cd) was studied in surface sediments of the Cross River Estuary (CRE), Gulf of Guinea, South East Nigeria. Pb (~56 %), Cd (~71 %), Zn (~67 %), and Cr (~76 %) were mainly available in non-residual phases, suggesting potential bioavailability. High contents of Ni and Cu in residual phase indicated immobilization of these metals in aluminosilicate minerals. Cd was the most polluted heavy metal with the highest bioavailability risk. Bayesian Network model results revealed that sedimentary organic carbon (OC) from terrestrial C3 plants controlled the contents and variability of Pb and Zn, while the input of terrestrial soil OC strongly influenced Cu and Ni. However, Cd and Cr were dominantly influenced by sediment pH, while Ni was mainly influenced by sediment salinity. Strong interdependency between Cd and total nitrogen (TN) suggested that nitrogen might increase Cd bioavailability upon release from sediments.
AB - The speciation of heavy metals (Ni, Cr, Cu, Zn, Pb, and Cd) was studied in surface sediments of the Cross River Estuary (CRE), Gulf of Guinea, South East Nigeria. Pb (~56 %), Cd (~71 %), Zn (~67 %), and Cr (~76 %) were mainly available in non-residual phases, suggesting potential bioavailability. High contents of Ni and Cu in residual phase indicated immobilization of these metals in aluminosilicate minerals. Cd was the most polluted heavy metal with the highest bioavailability risk. Bayesian Network model results revealed that sedimentary organic carbon (OC) from terrestrial C3 plants controlled the contents and variability of Pb and Zn, while the input of terrestrial soil OC strongly influenced Cu and Ni. However, Cd and Cr were dominantly influenced by sediment pH, while Ni was mainly influenced by sediment salinity. Strong interdependency between Cd and total nitrogen (TN) suggested that nitrogen might increase Cd bioavailability upon release from sediments.
KW - Bioavailability
KW - Estuarine sediments
KW - Heavy metals
KW - Influencing factors
KW - Speciation
UR - https://www.scopus.com/pages/publications/85140233692
U2 - 10.1016/j.marpolbul.2022.114257
DO - 10.1016/j.marpolbul.2022.114257
M3 - 文章
C2 - 36274556
AN - SCOPUS:85140233692
SN - 0025-326X
VL - 185
JO - Marine Pollution Bulletin
JF - Marine Pollution Bulletin
M1 - 114257
ER -