Centurial changes in sedimentary phosphorus forms and trace elements in response to damming and anthropogenic pollution in a floodplain lake, central China

2022 ◽  
Author(s):  
Lijuan Nie ◽  
Linghan Zeng ◽  
Jing Ji ◽  
Xu Chen
Keyword(s):  
Trace Elements ◽  
Anthropogenic Pollution ◽  
Central China ◽  
Floodplain Lake ◽  
Phosphorus Forms

scholarly journals Recent advances in analysis of trace elements in environmental samples by X-ray based techniques (IUPAC Technical Report)

2019 ◽  
Vol 91 (6) ◽  
pp. 1029-1063 ◽  
Author(s):  
Roberto Terzano ◽  
Melissa A. Denecke ◽  
Gerald Falkenberg ◽  
Bradley Miller ◽  
David Paterson ◽  
...  
Keyword(s):  
Trace Elements ◽  
Environmental Samples ◽  
Analytical Techniques ◽  
Anthropogenic Pollution ◽  
Chemical Extraction ◽  
Environmental Matrices ◽  
Environmental Sciences ◽  
X Ray ◽  
Environmental Media ◽  
Living Organisms

Abstract Trace elements analysis is a fundamental challenge in environmental sciences. Scientists measure trace elements in environmental media in order to assess the quality and safety of ecosystems and to quantify the burden of anthropogenic pollution. Among the available analytical techniques, X-ray based methods are particularly powerful, as they can quantify trace elements in situ. Chemical extraction is not required, as is the case for many other analytical techniques. In the last few years, the potential for X-ray techniques to be applied in the environmental sciences has dramatically increased due to developments in laboratory instruments and synchrotron radiation facilities with improved sensitivity and spatial resolution. In this report, we summarize the principles of the X-ray based analytical techniques most frequently employed to study trace elements in environmental samples. We report on the most recent developments in laboratory and synchrotron techniques, as well as advances in instrumentation, with a special attention on X-ray sources, detectors, and optics. Lastly, we inform readers on recent applications of X-ray based analysis to different environmental matrices, such as soil, sediments, waters, wastes, living organisms, geological samples, and atmospheric particulate, and we report examples of sample preparation.

Wintertime measurements of aerosol acidity and trace elements in Wuhan, a city in central China

1991 ◽  
Vol 25 (1) ◽  
pp. 113-120 ◽  
Author(s):  
J.M. Waldman ◽  
P.J. Lioy ◽  
M. Zelenka ◽  
L. Jing ◽  
Y.N. Lin ◽  
...  
Keyword(s):  
Trace Elements ◽  
Central China ◽  
Aerosol Acidity

scholarly journals Seasonal and Spatial Distribution of Soil Trace Elements around Kitchener Drain in the Northern Nile Delta, Egypt

Agriculture ◽  
2019 ◽  
Vol 9 (7) ◽  
pp. 152 ◽  
Author(s):  
Abeer Aitta ◽  
Hassan El-Ramady ◽  
Tarek Alshaal ◽  
Ahmed El-Henawy ◽  
Mohamed Shams ◽  
...  
Keyword(s):  
Trace Elements ◽  
Water Samples ◽  
Nile Delta ◽  
Agricultural Soils ◽  
Anthropogenic Pollution ◽  
Contaminated Water ◽  
Plant Tissues ◽  
Dredged Materials ◽  
Spatial And Seasonal Variation ◽  
Soil Trace Elements

The pollution of agricultural soils, water and plants by trace elements (TEs) in the Nile Delta Region, Egypt, is of great importance. This study aimed to investigate the spatial and seasonal variation of some TEs in the agricultural area adjacent to Kitchener Drain and to evaluate the ecological risk posed by these elements using six indices. Soil and plant samples were collected from seven sites close to the drain, while water samples were collected from the corresponding sites inside the drain during three seasons (winter, spring and fall). The results showed that all studied TEs in the soil varied seasonally and spatially among the locations around the drain. Most of the studied elements in the soil were higher in the southern and middle area around the drain. All studied elements in the soil were also higher in the winter than other seasons. Nickel and lead were almost non-detected during all seasons in plant tissues, while other elements were higher in the winter than other seasons. In contrast to the soil and plant tissues, water samples demonstrated lower or non-detected levels of TEs. The results also indicated that the values for the risk assessment indices differed among the studied TEs. Therefore, there is a risk of increasing the concentration of some metals in the study area due to anthropogenic pollution from the adjacent polluted drain through irrigation with contaminated water and spreading of contaminated dredged materials on agricultural fields.

scholarly journals Mechanisms Contributing to Suppressed Precipitation in Mt. Hua of Central China. Part I: Mountain Valley Circulation

2016 ◽  
Vol 73 (3) ◽  
pp. 1351-1366 ◽  
Author(s):  
Yan Yang ◽  
Jiwen Fan ◽  
L. Ruby Leung ◽  
Chun Zhao ◽  
Zhanqing Li ◽  
...  
Keyword(s):  
Water Vapor ◽  
Eastern China ◽  
Wrf Model ◽  
Anthropogenic Pollution ◽  
Central China ◽  
Precipitation Trend ◽  
Surface Cooling ◽  
Mountain Ranges ◽  
Mountain Valley ◽  
Orographic Clouds

Abstract A significant reduction in precipitation in the past decades has been documented over many mountain ranges such as those in central and eastern China. Consistent with the increase of air pollution in these regions, it has been argued that the precipitation trend is linked to the aerosol microphysical effect on suppressing warm rain. Rigorous quantitative investigations on the reasons responsible for the precipitation reduction are lacking. In this study, an improved Weather Research and Forecasting (WRF) Model with online coupled chemistry (WRF-Chem) is applied and simulations are conducted at the convection-permitting scale to explore the major mechanisms governing changes in precipitation from orographic clouds in the Mt. Hua area in central China. It is found that anthropogenic pollution contributes to a ~40% reduction of precipitation over Mt. Hua during the 1-month summertime period. The reduction is mainly associated with precipitation events associated with valley–mountain circulation and a mesoscale cold-front event. In this paper (Part I), the mechanism leading to a significant reduction for the cases associated with valley–mountain circulation is scrutinized. It is found that the valley breeze is weakened by aerosols as a result of absorbing aerosol-induced warming aloft and cooling near the surface as a result of aerosol–radiation interaction (ARI). The weakened valley breeze and the reduced water vapor in the valley due to reduced evapotranspiration as a result of surface cooling significantly reduce the transport of water vapor from the valley to mountain and the relative humidity over the mountain, thus suppressing convection and precipitation in the mountain.

scholarly journals Concentrations, Distribution, Sources and Ecological Risk Assessment of Trace Elements in Soils from Wuhan, Central China

2018 ◽  
Vol 15 (12) ◽  
pp. 2873 ◽  
Author(s):  
Ababo Tadesse ◽  
Tekleweini Gereslassie ◽  
Qiang Xu ◽  
Xiaojun Tang ◽  
Jun Wang
Keyword(s):  
Trace Elements ◽  
Ecological Risk ◽  
Soil Depth ◽  
Risk Index ◽  
Principal Component ◽  
Central China ◽  
Anthropogenic Sources ◽  
Innovative Technology ◽  
The Mean ◽  
Mean Concentration

This study aimed to determine the concentration levels, potential sources and ecological risks of eleven trace elements, namely Cr, Fe, Co, Ni, Cu, As, Sb, Cd, Zn, Hg and Pb, in the soil from Huangpi district, Wuhan, Central China. Soil samples were collected from eighteen sites at soil depths of 1–10 and 10–20 cm and analyzed using Inductively Coupled Plasma-Mass Spectrometer ICP-MS (Thermo X SERIES 2, Scientific and Innovative Technology Co. Ltd., Beijing, China). The recorded mean concentration of the elements were in a decreasing order of Fe > Co > Cr > Ni > Pb > Cu > As > Cd > Sb > Zn > Hg. The mean concentration of trace elements, soil pH and total organic carbon (TOC) were higher at a soil depth of 1–10 cm. The obtained mean concentration of Cr, Co, As, Cd, Ni, Cu, Hg and Pb were above the soil background values of Wuhan and Hubei Province. The mean concentration values of Co, Ni and Cd, exceeded the recommended FAO (Food and Agriculture Organization)/ISRIC (International Soil Reference and Information Centre) (2004) and WHO/FAO (2001) values. Pearson’s correlation analysis illustrated that there was a strong and significant correlation between trace elements, whereas, a weak positive and negative correlation between elements and soil properties (pH and TOC). The principal component analysis (PCA) and cluster analysis (CA) result indicated that the concentration of trace elements in Huangpi soil were originated from anthropogenic sources. Potential ecological risk index (RI) of this study revealed that there is a high ecological risk of trace elements in the soil. Enrichment factor (EF) and geo-accumulation index (Igeo) of trace elements for this study indicated that the study area is strongly contaminated with Cd and Co. Generally, the finding of this research showed that Huangpi soil is contaminated.

Trace-element variations in an annually layered stalagmite as recorders of climatic changes and anthropogenic pollution in Central China

2014 ◽  
Vol 81 (2) ◽  
pp. 181-188 ◽  
Author(s):  
Liangcheng Tan ◽  
Chuan-Chou Shen ◽  
Yanjun Cai ◽  
Li Lo ◽  
Hai Cheng ◽  
...  
Keyword(s):  
Growth Rate ◽  
Organic Matter ◽  
Soil Layer ◽  
Local Environment ◽  
Anthropogenic Pollution ◽  
Central China ◽  
Temperature Changes ◽  
Organic Matter Concentration ◽  
Higher Temperature ◽  
Matter Concentration

AbstractWe analyzed variations in the Sr/Ca, Ba/Ca, REE/Ca (REE: rare earth element), Zn/Ca, and Pb/Ca ratios preserved in an annually layered stalagmite, XL21, from central China. The stalagmite record spans the 95 year period AD 1914–2008. The Sr/Ca and Ba/Ca ratios have a significant positive correlation with the stalagmite's growth rate, suggesting that they were primarily controlled by growth-rate variations. Variations in REE/Ca ratios are consistent with local temperature changes, suggesting temperature influenced REE concentrations in the stalagmite over decadal to annual timescales. Higher temperature in this humid area can increase vegetation cover, microbial activity, and organic decomposition in the soil, resulting in enhanced pCO2, organic matter concentration and reduced pH, and consequently increased REE mobilization from the overlying soil layer and host rock. Higher temperatures may also increase the natural Zn mobilization from the overlying soil mediated by organic matter and consequently may have led to increased Zn retention in XL21. An increasing trend is seen in the Pb/Ca ratios from XL21 since 1985, which is consistent with increased lead production in this area, and indicates an increase in mine-derived lead pollution in the local environment over the past 30 years.

scholarly journals Detrital zircon trace elements from the Mesozoic Jiyuan Basin, central China and its implication on tectonic transition of the Qinling Orogenic Belt

2019 ◽  
Vol 11 (1) ◽  
pp. 125-139 ◽  
Author(s):  
Min Wang ◽  
Wenfei Guo ◽  
Wentao Yang
Keyword(s):  
Trace Elements ◽  
Detrital Zircon ◽  
Middle Triassic ◽  
Tectonic Setting ◽  
Central China ◽  
Qinling Orogen ◽  
Tectonic Transition ◽  
Lithospheric Extension ◽  
Mountain System ◽  
Zircon Trace Elements

AbstractThe Qinling Orogen and the Jiyuan Basin constitute a basin-mountain system during the Early Mesozoic. Therefore, sediments from the Jiyuan Basin can be used to deduce the orogenic process of the Qinling Orogen. This paper attempts to use detrital zircon trace elements with ages ranging from the Late Carboniferous to the Middle Triassic that were obtained from the Jiyuan Basin to discuss the tectonic evolution of Qinling Orogen. On the tectonic setting discriminating diagrams, most grains are concentrated in convergent continental margins/orogenic settings,whereas the remaining samples (268 Ma, 265Ma, 264 Ma and 254Ma) are plotted in anorogenic field. Compared to the Early Paleozoic (400-500Ma) zircons, 306Ma and 281Ma grains represent higher Th/ Nb ratios, which might be related to the Mianlve oceanic crust subduction. The lower Th/Nb ratios containing 268 Ma, 265Ma, 264 Ma and 254Ma grains might indicate lithospheric extension subsequently. The final continent-continent collision between South China and North China blocks took place after the Middle Triassic (242Ma).

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