Magnetic properties of the surface sediments in the Yellow River Estuary and Laizhou Bay, Bohai Sea, China: Implications for monitoring heavy metals

JOURNAL OF HAZARDOUS MATERIALS

卷:410

Article

Li, Mingkun^1,3  Zhu, Shanying¹  Ouyang, Tingping^1,3  Tang, Jianhui²  Tang, Zhihua⁴ 

[1] South China Normal Univ, Sch Geog, Guangzhou 510631, Peoples R China

[2] Chinese Acad Sci, Yantai Inst Coastal Zone Res, Key Lab Coastal Environm Proc & Ecol Remediat, Yantai 264003, Peoples R China

[3] Chinese Acad Sci, Guangzhou Inst Geochem, Key Lab Ocean & Marginal Sea Geol, Guangzhou 510640, Peoples R China

[4] Chinese Acad Sci, Guangzhou Inst Energy Convers, Integrated Technol Ctr, Guangzhou 510640, Peoples R China

关键词: Heavy metals;    Environmental magnetism;    Yellow River Estuary;    Laizhou Bay;    Marine sediment;   

DOI  :  10.1016/j.jhazmat.2020.124579

来源: Elsevier

【 摘 要 】

The Yellow River Estuary (YRE) and adjacent Laizhou Bay (LB) encounter eco-environmental risks caused by heavy metals (HMs) pollution. Here magnetic measurements were performed on 239 surface sediment samples from the YRE and LB to establish a rapid and effective method for detecting HMs. Magnetite, maghemite, and hematite coexist in the sediments. The distributions of magnetic minerals are dominated by sediment sources (Yellow River in northern and western LB, and rivers in southern and eastern coastal LB), and the anticlockwise water current. Compared to the background values, Cd content is enriched for all samples, while Co, Cr, Ni, Cu, Zn, and Pb contents are lower for most samples. The low pollution load indexes (PLI) of HMs (< 1?1.56) indicate the unpolluted to moderately polluted status, while the muddy area is the most polluted. The principal component analysis indicates that Co, Cr, Ni, Cu, and Zn are mainly from natural weathering substances, while Cd and Pb are anthropogenic. Contents of fine-grained sediments and magnetic particles are positively correlated to Co, Ni, Cu, Zn, and PLI. The high-risk Co, Ni, Cu, and Zn regions can be quickly delineated with the frequencydependent susceptibility.

【 授权许可】

Free