Pollution Distribution Characteristics and Ecological Risk Assessment of Heavy Metals and Polycyclic Aromatic Hydrocarbons in the River Sediments in Anning, Yunnan Province

FAN Chen-zi; LIU Yong-bing; ZHAO Wen-bo; LIU Cheng-hai; YUAN Ji-hai; GUO Wei; HAO Nai-xuan

doi:10.15898/j.cnki.11-2131/td.202103080035

Rock and Mineral Analysis > 2021 > 40(4): 570-582. > DOI: 10.15898/j.cnki.11-2131/td.202103080035

FAN Chen-zi, LIU Yong-bing, ZHAO Wen-bo, LIU Cheng-hai, YUAN Ji-hai, GUO Wei, HAO Nai-xuan. Pollution Distribution Characteristics and Ecological Risk Assessment of Heavy Metals and Polycyclic Aromatic Hydrocarbons in the River Sediments in Anning, Yunnan Province[J]. Rock and Mineral Analysis, 2021, 40(4): 570-582. DOI: 10.15898/j.cnki.11-2131/td.202103080035

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Pollution Distribution Characteristics and Ecological Risk Assessment of Heavy Metals and Polycyclic Aromatic Hydrocarbons in the River Sediments in Anning, Yunnan Province

1.
National Research Center for Geoanalysis; Key Laboratory of Micro- and Element Forms Analysis, China Geological Survey, Beijing 100037, China
2.
School of Materials Science and Technology, China University of Geosciences(Beijing), Beijing 100083, China

More Information

Received Date: March 07, 2021
Revised Date: May 10, 2021
Accepted Date: July 01, 2021
Published Date: July 27, 2021

Abstract

HIGHLIGHTS
(1) The heavy metals in Anning sediments exhibit high concentrations and are unevenly distributed, and Cd, Hg, and As have high ecological risks.

(2) The average content of polycyclic aromatic hydrocarbons (PAHs) in the sediments is high, and the combustion of petroleum fuels is the main source.

(3) The potential risks of pollutants are concentrated in the vicinity of iron and steel, chemicals industries, and other factories that mine along the Tanglangchuang River.

ABSTRACT

BACKGROUNDAnning is an important industrial and mining city in the upper reaches of the Yangtze River Economic Belt. It is a fulcrum for economic development and ecological civilization construction in the Central Yunnan New Area. The investigation of geochemical water system sediments and hydrogeology in the Anning area was last performed in the 1970s and the 1980s. In recent years, the impact of human production and life on the ecological environment remains unclear.
OBJECTIVESSurface sediment samples from the Anning area were investigated to reveal their pollution status, spatial distribution characteristics, and potential ecological risks of river sediments.
METHODSX-ray fluorescence spectroscopy, inductively coupled plasma optical mass spectrometry, gas chromatography-mass spectrometry, and other methods were used to systematically analyze the contents and distribution characteristics of major elements, trace elements, and 16 priority-controlled PAHs. Geoaccumulation index, Hankanson ecological risk index, and sediment quality criteria were used to assess the ecological risk of eight typical heavy metals (As, Cd, Cr, Cu, Ni, Zn, Pb, and Hg) and PAHs.
RESULTSResults showed that the heavy metal content in the river sediments from the Anning area was higher than the background values of the national and southern rivers. The spatial distributions of the heavy metals were highly variable and uneven. Additionally, Cd, Hg, and Ad showed medium to severe potential ecological risks. The average content of ∑PAHs was 20856ng/g, and the detection rate of the 16 monomers was ~100%. The overall ecological risk of PAHs was low, and their main sources were petrochemical industry and combustion of petroleum fuels. The major risks of pollutants in the river sediments of the Anning area were mainly concentrated in the vicinity of steel plants and chemical factories in the Tanglangchuan River.
CONCLUSIONSThis research provides a scientific basis for local governments to strengthen key industrial point source pollution control, and reduce and control industrial sewage discharge.

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References (45)

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Pollution Distribution Characteristics and Ecological Risk Assessment of Heavy Metals and Polycyclic Aromatic Hydrocarbons in the River Sediments in Anning, Yunnan Province

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