Assessment and source analysis of heavy metal contamination in water and surface sediment in Dongping Lake, China. (November 2022)

• Record Type: Journal Article
• Authors: Zhang, Zhanfei; Yu, Na; Liu, Dingying; Zhang, Yinghao
• Is Part Of: Chemosphere. Volume 307:Part 3(2022)
• Publication Date: 2022-11
• Subjects: Heavy metal -- Pollution assessment -- Ecological risk -- Source analysis -- Dongping lake; Pollution -- Periodicals; Pollution -- Physiological effect -- Periodicals; Environmental sciences -- Periodicals; Atmospheric chemistry -- Periodicals; 551.511
• DOI: 10.1016/j.chemosphere.2022.136016
• Languages: English
• ISSNs: 0045-6535

Abstract

Abstract: Dongping Lake is the only natural lake in the lower Yellow River and an important hub of South-North Water Diversion Project, its water quality is of vital importance to the environmental protection and the security of water supply. To assess the heavy metal (HM) contamination in Dongping Lake, samples in water and surface sediment were taken from 59 sampling sites over the entire lake. The statistical characteristics, pollution conditions, and source identifications were analyzed using coupling methods of entropy water quality index ( EWQI ), modified pollution index ( mC d ), enrichment coefficient ( EF ), geo-accumulation index ( I geo ), potential ecological risk index ( PERI ), and positive matrix factorization (PMF). In present study, the averaged concentrations of all studied HMs in water body of Dongping Lake were below the limit of drinking water quality standard recommended by WHO, and the EWQI and mC d of HM concentrations were identified to be in good and excellent conditions. The concentrations of almost all studied HMs in surface sediment of Dongping Lake exceeded the background values in the soil of Shandong Province, and Cd (cadmium) was the dominant pollutant. With EF > 2, I geo > 1, and E r > 80, Cd in sediment was under moderate pollution. The outcomes of source analysis revealed that the HMs in surface sediment were mainly derived from the primary and secondary industries. Specifically, manufacturing industries contributed the most to the HM contaminations in sediment of Dongping Lake. Graphical abstract: Image 1 Highlights: Heavy metal (HM) pollution in both water and surface sediment of Dongping Lake were evaluated. All studied HM concentrations in lake water body were below the pollution limit. HMs in surface sediment were in different pollution degrees. Cd (cadmium) was the dominant pollutant in surface sediment of Dongping Lake. Manufacturing was identified as the dominant sources for HMs in Dongping Lake.