Search results for: Enfeng Liu

Items from 1 to 20 out of 44 results

article

Ecological risk assessment of potentially toxic elements (PTEs) in the soil-plant system after reclamation of dredged sediment

Hezhong Yuan, Siyuan Song, Shuqing An, Enfeng Liu

Environmental Science and Pollution Research > 2018 > 25 > 29 > 29181- 29191

The Shayinghe River is an important tributary of the Huaihe River in China. The concentrations of potential toxic elements (PTEs), such as As, Hg, Pb, Cu, Zn, Cr, and Cd in soils and dominant vegetation from mud-dumping areas reclaimed with dredged sediments, and areas without mud-dumping (non-mud-dumping areas) adjacent to the Shayinghe River were investigated. The potential ecological risk index...

article

Reconstruction of atmospheric trace metals pollution in Southwest China using sediments from a large and deep alpine lake: Historical trends, sources and sediment focusing

Qi Lin, Enfeng Liu, Enlou Zhang, Bibhash Nath, more

Science of The Total Environment > 2018 > 613-614 > C > 331-341

Atmospheric pollution, one of the leading environmental problems in South and East Asia, and its impact on the terrestrial environmental quality remain poorly understood particularly in alpine areas where both historical and present-day mining and smelting operations might leave an imprint. Here, we reconstructed atmospheric trace metals pollution during the past century using core sediments from...

article

A 2500-year climate and environmental record inferred from subfossil chironomids from Lugu Lake, southwestern China

Jie Chang, Enlou Zhang, Enfeng Liu, Weiwei Sun, more

Hydrobiologia > 2018 > 811 > 1 > 193-206

We present a sediment record from Lugu Lake, a large and deep alpine lake in southwestern China, spanning the last c.2500 cal yr BP. This multi-proxy study focussed on subfossil chironomids but also included analyses of chemical elements using inductively coupled plasma-atomic emission spectrometry (ICP-AES), magnetic susceptibility, total organic carbon (TOC), total nitrogen (TN) and grain size....

article

Factorial kriging analysis and pollution evaluation of potentially toxic elements in soils in a phosphorus-rich area, South Central China

Chenchang Du, Enfeng Liu, Nengcheng Chen, Wei Wang, more

Journal of Geochemical Exploration > 2017 > 175 > C > 138-147

Identifying spatial variations of potentially toxic elements at different spatial scales and their contamination conditions is important for soil management and remediation. Utilizing a 1km×1km sampling grid, a total of 615 soil samples were collected from a phosphorus-rich area of South Central China and determined for arsenic (As), cadmium (Cd), cobalt (Co), chromium (Cr), copper (Cu), nickel (Ni),...

article

Historical records and sources of polycyclic aromatic hydrocarbons (PAHs) and organochlorine pesticides (OCPs) in sediment from a representative plateau lake, China

Hezhong Yuan, Enfeng Liu, Enlou Zhang, Wenlei Luo, more

Chemosphere > 2017 > 173 > C > 78-88

The PAH and OCP concentrations in sediment cores collected from a deep lake were measured and evaluated chronologically. The results indicated that the PAH and OCP concentrations significantly increased from the 1950s to the 1990s and subsequently decreased to recent years. Integrated molecular diagnostic ratios indicated that the predominant petrogenic sources occurred from the 1950s–1980s. Petroleum...

article

Oscillations in the Indian summer monsoon during the Holocene inferred from a stable isotope record from pyrogenic carbon from Lake Chenghai, southwest China

Weiwei Sun, Enlou Zhang, Enfeng Liu, Ming Ji, more

Journal of Asian Earth Sciences > 2017 > 134 > C > 29-36

A robust, well-dated record of centennial-scale abrupt changes in the Asian summer monsoon is crucial for understanding the potential forcing factors and their environmental effects. In this study, we analyzed the stable carbon isotopes of pyrogenic carbon (δ¹³C_PC) in a 556-cm long sediment core retrieved from Lake Chenghai in the Yunnan Plateau, China. The results provide a continuous 7660-year precipitation...

article

Historical variations of atmospheric trace metal pollution in Southwest China: Reconstruction from a 150-year lacustrine sediment record in the Erhai Lake

Kai Li, Enfeng Liu, Enlou Zhang, Yanling Li, more

Journal of Geochemical Exploration > 2017 > 172 > C > 62-70

A 35-cm long sediment core - retrieved from Erhai Lake - was analyzed for Pb isotope ratios (²⁰⁷Pb/²⁰⁶Pb and ²⁰⁸Pb/²⁰⁶Pb) and trace metal concentrations (Cr, Cu, Ni, Hg, Pb and Zn) to gain an understanding of atmospheric trace metal pollution over the last 150years in Southwest China. Core chronology was established by using the ²¹⁰Pb and ¹³⁷Cs dating techniques. Principal component analysis (PCA)...

article

Spatial distribution, contamination and ecological risk assessment of heavy metals in surface sediments of Erhai Lake, a large eutrophic plateau lake in southwest China

Qi Lin, Enfeng Liu, Enlou Zhang, Kai Li, more

CATENA > 2016 > 145 > C > 193-203

The concentrations of heavy metals (As, Cd, Cr, Cu, Hg, Ni, Pb and Zn) and major metals (Al, Fe and Ti) in 42 surface sediment (0–2cm) samples from Erhai Lake, a large eutrophic plateau lake in southwest China, were analyzed. The heavy metal contamination was studied by comparing the multivariate statistical analysis and enrichment factor (EF) results, and the potential eco-risks were comparatively...

article

Biogeochemical processes and response to climate change recorded in the isotopes of lacustrine organic matter, southeastern Qinghai-Tibetan Plateau, China

Weiwei Sun, Enlou Zhang, Richard T. Jones, Enfeng Liu, more

Palaeogeography, Palaeoclimatology, Palaeoecology > 2016 > 453 > C > 93-100

Large amount of labile organic matter sequestered in Qinghai–Tibetan Plateau (QTP), the highest plateau in the world. However, large uncertainties remained in the response of biogeochemical cycling to climate change due to the lack of spatial and temporal resolution of climatic and ecosystem records in the plateau. Here, we present the stable carbon (δ¹³C) and nitrogen (δ¹⁵N) isotope records from...

article

Black carbon record of the wildfire history of western Sichuan Province in China over the last 12.8 ka

Weiwei Sun, Enlou Zhang, Ji Shen, Rong Chen, more

Frontiers of Earth Science > 2016 > 10 > 4 > 634-643

Wildfire is recognized as a critical Earth system process which affects the global carbon cycle, atmospheric chemistry, and ecosystem dynamics. Estimating the potential impact of future climate change on the incidence of fire requires an understanding of the long-term interactions of fire, climate, vegetation, and human activity. Accordingly, we analyzed the black carbon content and the pollen stratigraphy...

article

Diatom response to Asian monsoon variability during the Holocene in a deep lake at the southeastern margin of the Tibetan Plateau

Yanling Li, Enfeng Liu, Xiayun Xiao, Enlou Zhang, more

Boreas > 44 > 4 > 785 - 793

Diatom analysis was applied to a 5.56‐m‐long sediment core, spanning the last 7.8 ka, from Lake Chenghai on the southeastern margin of the Tibetan Plateau. Diatom assemblages are dominated by Cyclotella rhomboideo‐elliptica, Cyclostephanos dubius and small fragilarioid and periphytic taxa. These diatom taxa are interpreted to be sensitive to changes in trophic status and/or turbulence of the water...

article

Spatial distribution, ecological risk assessment and source identification for heavy metals in surface sediments from Dongping Lake, Shandong, East China

Yunqian Wang, Liyuan Yang, Linghao Kong, Enfeng Liu, more

Catena > 2015 > 125 > Complete > 200-205

Surface sediment samples collected from 18 sites in Dongping Lake were analyzed for selected heavy metals including As, Cd, Cr, Cu, Hg, Pb, and Zn to determine their spatial distribution, source, and potential ecological risks. The enrichment degree of the studied metals decreased in the order of Cd > Hg > As > Pb > Cu > Cr > Zn, and the average concentrations of Cd, Hg and As were...

article

Species and environmental geochemistry characteristics of organic phosphorus in sediments of a riverine wetland measured by ³¹P-NMR spectroscopy

Hezhong Yuan, Wei Pan, Ji Shen, Enfeng Liu, more

Geochemistry International > 2015 > 53 > 12 > 1141-1149

Phosphorus species in sediment cores obtained from a representative riverine wetland were determined and organic phosphorus was distinguished with phosphorus-31 nuclear magnetic resonance (³¹P-NMR) spectroscopy. The concentrations and distributions of orthophosphate, orthophosphate monoester, orthophosphate diester and pyrophosphate were subsequently characterized. Total phosphorus, total inorganic...

article

The accumulation and potential ecological risk of heavy metals in microalgae from a eutrophic lake (Taihu Lake, China)

Hezhong Yuan, Enfeng Liu, Ji Shen

Environmental Science and Pollution Research > 2015 > 22 > 21 > 17123- 17134

This study aimed to evaluate the bioaccumulation and enrichment of heavy metals in dominant microalgae and assess the potential ecological risk to the microalgae located at the northern region of Taihu Lake, China, a shallow freshwater lake. The concentrations of heavy metals (As, Cd, Cr, Cu, Hg, Ni, Pb, and Zn) in water and microalgae (predominant cyanophyta) collected from the north of Taihu Lake...

article

Species and Characteristics of Organic Phosphorus in Surface Sediments of Northwest Region of Taihu Lake, Eastern China

Hezhong Yuan, Enfeng Liu, Wei Pan, Qifang Geng, more

CLEAN – Soil, Air, Water > 42 > 11 > 1518 - 1525

Various organic phosphorus species in surface sediments from the northwest area of Taihu Lake, China, were measured using organic phosphorus fractionation scheme and the relationships among total organic carbon and different phosphorus species including total phosphorus (TP), total inorganic phosphorus, total organic phosphorus (TOP), microbial biomass P (Biomass‐Po), fulvic‐associated P (FA‐Po),...

article

Pollution and health risk of potentially toxic metals in urban road dust in Nanjing, a mega-city of China

Enfeng Liu, Ting Yan, Gavin Birch, Yuxin Zhu

Science of the Total Environment > 2014 > 476-477 > Complete > 522-531

Spatial variations in concentrations of a suite of potentially toxic metals (Ba, Cr, Cu, Fe, Mn, Ni, Pb and Zn) and Ca in road dusts (n=99) from urban trunk roads (TR) in Nanjing, a mega-city in China, were established. Metal pollution levels, sources and human health risk (non-carcinogenic) were studied. In contrast to previous studies, we labeled the indicative metals relating to non-exhaust traffic...

article

Characteristics and origins of heavy metals in sediments from Ximen Co Lake during summer monsoon season, a deep lake on the eastern Tibetan Plateau

Hezhong Yuan, Enfeng Liu, Ji Shen, Hengjie Zhou, more

Journal of Geochemical Exploration > 2014 > 136 > Complete > 76-83

The concentration and enrichment factor (EF) values of heavy metals in sediments collected from Ximen Co Lake, a deep lake on the eastern Tibetan Plateau, displayed obvious changes on profile in August of 2009. The dominating contaminating elements were Be, Ag, Cd, Pb and As. The high concentration and EF values showed that the anthropogenic pollutants in atmospheric aerosol from the West, Central...

article

A comparative study of metal pollution and potential eco-risk in the sediment of Chaohu Lake (China) based on total concentration and chemical speciation

Enfeng Liu, Ji Shen

Environmental Science and Pollution Research > 2014 > 21 > 12 > 7285-7295

Total and extractable concentrations of Cu, Pb, and Zn were determined in surface sediments of west Chaohu Lake (China) by HCl-HNO₃-HF-HClO₄ digestion and an optimized BCR sequential extraction procedure, respectively. The metal pollution was evaluated by the enrichment factor approach, and the potential eco-risk was evaluated by the sediment quality guideline (SQG) and risk assessment code (RAC)...

article

The characteristic and environmental pollution records of phosphorus species in different trophic regions of Taihu Lake, China

Hezhong Yuan, Shuqing An, Ji Shen, Enfeng Liu

Environmental Earth Sciences > 2014 > 71 > 2 > 783-792

Total organic carbon (TOC), Total nitrogen (TN) and the phosphorus species concentrations of sediment cores taken from Zhushan Bay, Meiliang Bay, and East Taihu Lake regions in Taihu Lake, a large shallow lake in China, were determined. Experimental results showed a conspicuous eutrophication trend in the northern area of Taihu Lake. Inorganic P was found to be the main phosphorus form. Fe-bound P...

article

Assessment of heavy metal enrichment and its human impact in lacustrine sediments from four lakes in the mid-low reaches of the Yangtze River, China

Haijian Bing, Yanhong Wu, Enfeng Liu, Xiangdong Yang

Journal of Environmental Sciences > 2013 > 25 > 7 > 1300-1309

Sediments from four lakes in the mid-low reaches of the Yangtze River, Taibai Lake, Longgan Lake, Chaohu Lake and Xijiu Lake, were chosen to evaluate their enrichment state and history. The state of heavy metal enrichment was at a low level in the sediment of Taibai Lake and Longgan Lake. The enrichment state of Co, Cr and Ni was also low in the sediment of Chaohu Lake and Xijiu Lake, while Cu, Pb...

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Search results for: Enfeng Liu

Ecological risk assessment of potentially toxic elements (PTEs) in the soil-plant system after reclamation of dredged sediment

Reconstruction of atmospheric trace metals pollution in Southwest China using sediments from a large and deep alpine lake: Historical trends, sources and sediment focusing

A 2500-year climate and environmental record inferred from subfossil chironomids from Lugu Lake, southwestern China

Factorial kriging analysis and pollution evaluation of potentially toxic elements in soils in a phosphorus-rich area, South Central China

Historical records and sources of polycyclic aromatic hydrocarbons (PAHs) and organochlorine pesticides (OCPs) in sediment from a representative plateau lake, China

Oscillations in the Indian summer monsoon during the Holocene inferred from a stable isotope record from pyrogenic carbon from Lake Chenghai, southwest China

Historical variations of atmospheric trace metal pollution in Southwest China: Reconstruction from a 150-year lacustrine sediment record in the Erhai Lake

Spatial distribution, contamination and ecological risk assessment of heavy metals in surface sediments of Erhai Lake, a large eutrophic plateau lake in southwest China

Biogeochemical processes and response to climate change recorded in the isotopes of lacustrine organic matter, southeastern Qinghai-Tibetan Plateau, China

Black carbon record of the wildfire history of western Sichuan Province in China over the last 12.8 ka

Diatom response to Asian monsoon variability during the Holocene in a deep lake at the southeastern margin of the Tibetan Plateau

Spatial distribution, ecological risk assessment and source identification for heavy metals in surface sediments from Dongping Lake, Shandong, East China

Species and environmental geochemistry characteristics of organic phosphorus in sediments of a riverine wetland measured by ³¹P-NMR spectroscopy

The accumulation and potential ecological risk of heavy metals in microalgae from a eutrophic lake (Taihu Lake, China)

Species and Characteristics of Organic Phosphorus in Surface Sediments of Northwest Region of Taihu Lake, Eastern China

Pollution and health risk of potentially toxic metals in urban road dust in Nanjing, a mega-city of China

Characteristics and origins of heavy metals in sediments from Ximen Co Lake during summer monsoon season, a deep lake on the eastern Tibetan Plateau

A comparative study of metal pollution and potential eco-risk in the sediment of Chaohu Lake (China) based on total concentration and chemical speciation

The characteristic and environmental pollution records of phosphorus species in different trophic regions of Taihu Lake, China

Assessment of heavy metal enrichment and its human impact in lacustrine sediments from four lakes in the mid-low reaches of the Yangtze River, China

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