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Seasonal, spatial variation, and pollution sources of heavy metals in the sediment of the Saigon River, Vietnam
Environmental Pollution Số , năm 2020 (Tập 256, trang -)
DOI: 10.1016/j.envpol.2019.113412
Tài liệu thuộc danh mục: Scopus
English
English
Từ khóa: Catchments; Cluster analysis; Drought; Erosion; Heavy metals; Hierarchical systems; Holmium; Metal analysis; Organic carbon; Particle size; Particle size analysis; Principal component analysis; Rivers; Runoff; Sediments; Size distribution; Correlation analysis; Hierarchical cluster analysis; Metals and metalloids; Organic carbon contents; Pollution sources; Seasonal and spatial distributions; Seasonal variation; Sediment concentration; River pollution; aluminum; boron; cadmium; cobalt; heavy metal; indium; iron; lead; manganese; nickel; organic carbon; strontium; zinc; heavy metal; fluvial deposit; heavy metal; metalloid; pollutant source; seasonal variation; sediment pollution; spatial distribution; spatial variation; agricultural land; catchment; concentration (parameter); electric conductivity; environmental erosion; particle size; pH; river ecosystem; seasonal variation; sediment; Viet Nam; water erosion; water pollution; water sampling; chemistry; city; environmental monitoring; pollution; river; season; sediment; water pollutant; Saigon River; Viet Nam; Cities; Environmental Monitoring; Environmental Pollution; Geologic Sediments; Metals, Heavy; Rivers; Seasons; Vietnam; Water Pollutants, Chemical
Tóm tắt tiếng anh
The current study was conducted to (1) examine seasonal and spatial distribution of heavy metals and metalloid in sediment from the Saigon River and (2) apportion and quantify their pollution sources. Ninety-six sediment samples were taken in the rainy and dry season on 13 sampling sites, distributed over the lower reaches of the River, to analyze for exchangeable concentration of 11 heavy metals and metalloid (Al, B, Cd, Co, Fe, In, Mn, Ni, Pb, Sr, and Zn), pH, EC, organic carbon content, and particle-size distribution. Generally, the concentration of 11 elements was ranked in the order Mn > Al > Fe > Zn > Sr > In > B > Ni > Co > Pb > Cd. Hierarchical cluster analysis grouped 13 sampling sites into two parts based on the similar concentration of the 11 elements. Three-way analysis of variance showed that the total exchangeable concentration of 11 elements was significantly higher in the rainy season than in the dry season and in the upper part than in the lower part of the river. Principal component analysis/factor analysis and correlation analysis revealed that three pollution sources (PS) may contribute to enriching the 11 examined elements in the sediment. These sources included (PS1) from catchment through water erosion over natural areas, explaining 83%, (PS2) mixed sources from catchment through water erosion over agricultural fields and inside Ho Chi Minh City, accounting for 6%, and (PS3) mixed sources from lowland areas, explaining 7.8% of the total variance of the elements. In brief, the sediment concentration of 11 metals and metalloid varied with season and space and three major pollution sources from river catchment, inside Ho Chi Minh City, and lowland contributively enriched the elements in the sediment of the River. � 2019 Elsevier Ltd
