scholarly journals Assessment of tea garden soils at An'xi County in southeast China reveals a mild threat from contamination of potentially harmful elements

2018 ◽  
Vol 5 (8) ◽  
pp. 180050 ◽  
Author(s):  
Hai-Lei Cao ◽  
Feng-Ying Cai ◽  
Wen-Bin Jiao ◽  
Cheng Liu ◽  
Ning Zhang ◽  
...  
Keyword(s):  
Risk Assessment ◽  
Ecological Risk ◽  
Ecological Risk Assessment ◽  
System Analysis ◽  
Risk Index ◽  
Extensive Study ◽  
National Standards ◽  
Geographical Information ◽  
Potentially Harmful Elements ◽  
Tea Garden

An extensive study of the spatial distribution characteristics of potentially harmful elements (PHEs) in tea ( Camellia sinensis (L.) O. Kuntze) garden soils and ecological risk assessment at An'xi County, the birthplace of oolong tea in China, was implemented. A total of 78 soil samples were examined to determine the concentration of five PHEs (As, Cd, Cr, Hg and Pb), soil organic matter and pH by using geostatistical approaches combined with geographical information system analysis. All PHEs presented in the study area were slightly higher than their background values for provincial and national standards except Cr. Moreover, ecological risk assessment of PHEs in the tea garden soils at An'xi County was performed by means of the Håkanson method. The average ecological potential risk index ( E r ) of the five PHEs followed a descending order of Cd > Hg > Pb > As > Cr, and suggested a moderate ecological risk in the study area.

scholarly journals Heavy Metals Distribution, Sources, and Ecological Risk Assessment in Huixian Wetland, South China

Water ◽  
2020 ◽  
Vol 12 (2) ◽  
pp. 431
Author(s):  
Liangliang Huang ◽  
Saeed Rad ◽  
Li Xu ◽  
Liangying Gui ◽  
Xiaohong Song ◽  
...  
Keyword(s):  
Heavy Metals ◽  
Risk Assessment ◽  
Ecological Risk ◽  
South China ◽  
Ecological Risk Assessment ◽  
Risk Index ◽  
Pollution Index ◽  
Principal Component ◽  
Potential Ecological Risk ◽  
Anthropogenic Sources

This research has focused on the source identification, concentration, and ecological risk assessment of eight heavy metals in the largest karst wetland (Huixian) of south China. Numerous samples from superficial soil and sediment within ten representative landuse types were collected and examined, and the results were analyzed using multiple methods. Single pollution index (Pi) results were underpinned by the Geoaccumulation index (Igeo) method, in which Cd was observed as the priority pollutant with the highest contamination degree in this area. As for the most polluted landuse type, via applying Nemerow’s synthetical contamination index (PN) and Potential ecological risk index (RI), the river and rape field posed the highest ecological risks, while moderate for the rest. To quantify the drivers of the contaminants, a principal component analysis (PCA) was carried out and weathering of the watershed’s parent carbonate rocks was found to be the main possible origin, followed by anthropogenic sources induced by agricultural fertilizer. Considering the impacts of these potentially toxic elements on public health, the results of this study are essential to take preventive actions for environmental protection and sustainable development in the region.

scholarly journals Identification of the Chemical Forms of Heavy Metals in Municipal Sewage Sludge as a Critical Element of Ecological Risk Assessment in Terms of Its Agricultural or Natural Use

2020 ◽  
Vol 17 (13) ◽  
pp. 4640 ◽  
Author(s):  
Malwina Tytła
Keyword(s):  
Heavy Metals ◽  
Risk Assessment ◽  
Sewage Sludge ◽  
Ecological Risk ◽  
Ecological Risk Assessment ◽  
Municipal Wastewater ◽  
Risk Index ◽  
Municipal Sewage Sludge ◽  
Critical Element ◽  
Chemical Forms

The present study aimed to demonstrate that identification of the chemical forms of heavy metals in sewage sludge produced in municipal Wastewater Treatment Plants (WWTPs) is a critical element of ecological risk assessment, especially in terms of its agricultural or natural use. The concentrations of seven heavy metals (Cd, Cr, Cu, Ni, Pb, Zn and Hg) were determined using inductively coupled plasma optical spectrometry (ICP-OES) and cold vapor atomic absorption spectrometry (CV-AAS). The chemical forms of heavy metals were analyzed in accordance with the sequential extraction method proposed by the Community Bureau of Reference (BCR). Sludge samples were collected at the five municipal WWTPs located in the largest industrial area in the country, i.e., the Upper Silesian Industrial Region (southern Poland, central Europe). The ecological risk was assessed by calculating the Potential Ecological Risk Factor (ER), Risk Index (RI), Risk Assessment Code (RAC), Individual Contamination Factor (ICF), Global Risk Index (GRI) as well as the author’s indices, i.e., Individual Ecological Risk (IER) and Global Ecological Risk (GER). To demonstrate the differences between the level of ecological risk posed by the different heavy metals, sludge samples were collected at two specific points of the processing line. Considering the chemical forms of heavy metals, the highest ecological risk was posed by Zn, Cd and Ni, while in the case of their total concentrations, by Cd and Hg. The obtained results confirm that quantitative determination of the total content of heavy metals in sewage sludge is not a sufficient criterion in assessment of the ecological risk that these elements pose to the natural environment and living organisms. Moreover, multivariate statistical analysis revealed a significant correlation between the concentrations of heavy metals, which indicates that they plausibly originate from the same source of pollution.

scholarly journals Ecological Risk Assessment of Soil Heavy Metals and Pesticide Residues in Tea Plantations

Agriculture ◽  
2020 ◽  
Vol 10 (2) ◽  
pp. 47 ◽  
Author(s):  
Haifang He ◽  
Longqing Shi ◽  
Guang Yang ◽  
Minsheng You ◽  
Liette Vasseur
Keyword(s):  
Heavy Metals ◽  
Risk Assessment ◽  
Ecological Risk ◽  
Ecological Risk Assessment ◽  
Pesticide Residues ◽  
Risk Index ◽  
First Grade ◽  
Risk Level ◽  
Pollution Indices ◽  
Tea Plantations

Tea plantations have used many synthetic chemicals to ensure performance and control of pests. This has led to increased contamination of soils and reduced tea growth. We assessed the levels of heavy metals, including Cd, Cr, Pb, Cu, Ni, Zn, Hg, As, and pesticide residues, such as HCHs, biphenyl chrysanthemum ester, methamidophos, imidacloprid, permethrin, in the soil of tea plantations of Taiwan, Tibet, Guangdong, and Fujian. The Potential Ecological Risk Index and the Nemerow comprehensive pollution index were used to analyze the data. The results showed that risk indices in Tibet, Guangdong and Fuzhou were considered as moderate ecological harm level. Ecological risk assessment index of Anxi organic and Anxi conventional tea gardens suggested a “low” risk level. The Nemerow comprehensive pollution indices for soil pesticide residues in the tea plantations of Taiwan, Tibet, Anxi organic and Anxi conventional were considered mild. Guangdong and Fuzhou had values suggesting “slight pollution” levels. According to National Soil Environmental Quality Standard (GB15618-1995), soil in tea plantations in Taiwan, Tibet, and Anxi conventional matched the national first grade of soil quality and those from Guangdong, Fuzhou, and Anxi organic tea garden matched the national second grade.

scholarly journals The Ecological Risk Assessment and the Chemical Speciation of Heavy Metals in Ash after the Incineration of Municipal Sewage Sludge

2020 ◽  
Vol 12 (16) ◽  
pp. 6517 ◽  
Author(s):  
Jolanta Latosińska ◽  
Przemysław Czapik
Keyword(s):  
Heavy Metals ◽  
Risk Assessment ◽  
Sewage Sludge ◽  
Soil Contamination ◽  
Ecological Risk ◽  
Ecological Risk Assessment ◽  
Risk Index ◽  
Soil Environment ◽  
Sewage Sludge Ash ◽  
Sludge Ash

Popular incineration of sewage sludge results in the increase in heavy metals content in ash. The knowledge of the total content of heavy metals in sewage sludge ash does not demonstrate a potential hazard. The toxicity of heavy metals in great measure depends on the form of their occurrence. The prevailing norms do not require the ecological risk assessment of the environmental burden with heavy metals for the choice of the method of the utilization of sewage sludge ash. The paper presents the research results on the mobility of heavy metals in sewage sludge ash after its incineration. The geo-accumulation index (IGAI), the potential ecological risk index (PERI) and the risk assessment code (RAC) were used for the evaluation of the potential soil contamination with heavy metals. The authors also suggested a new formula, which took into consideration more factors influencing the risk of the contamination of a water-soil environment with heavy metals—the water and soil environment risk index (WSERI). The calculated indices for sewage sludge ash indicate the risk of soil contamination with heavy metals.

scholarly journals Ecological Risk Assessment of Typical Plateau Lakes

2021 ◽  
Vol 267 ◽  
pp. 01028
Author(s):  
Yuyadong ◽  
Yankun
Keyword(s):  
Risk Assessment ◽  
Ecological Risk ◽  
Ecological Risk Assessment ◽  
Risk Index ◽  
Pollution Index ◽  
Pollution Load Index ◽  
Assessment Methods ◽  
Pollution Level ◽  
Pollution Load ◽  
Index Method

Plateau lakes have significant ecological value. With economic development, lake pollution and ecological degradation have become increasingly prominent. There are many ecological risk assessment methods. This article combines four different ecological risk assessment methods including single-factor pollution index, geological accumulation index method, potential risk index method, and pollution load index method to analyze the heavy metal pollution in Yangzong seabed mud as comprehensively as possible. It shows that the results obtained by different ecological risk assessment methods are slightly different. The overall trends of the geological pollution index and the single-factor pollution index are similar. In terms of time, except for the two elements of mercury and cadmium, the contents of other heavy metals in 2019 are lower than in 2018, indicating that heavy metal pollution has decreased in 2019; from the perspective of spatial distribution, In 2018, the overall pollution level on the south side of Yangzonghai was higher than that in the central and northern regions of Yangzonghai . On the whole, whether it is the potential risk index or the appropriate pollution load index, the pollution level on the south side of Yangzonghai is higher than that in the central and northern areas of Yangzonghai, and the northern area has the least pollution.

scholarly journals Indentifikasi Kandungan Zink (Zn), Besi (Fe) dan Escherichia Coli Pada Sumber Air Bersih Dengan Analisis Spasial Ecological Risk Assessment Di Desa Tungka Kecamatan Enrekang Kabupaten Enrekang

2021 ◽  
Vol 2 (1) ◽  
pp. 30-54
Author(s):  
Dirman Sudarman ◽  
Alfina Baharuddin ◽  
Muhammad Ikhtiar ◽  
Haeruddin ◽  
Reza Aril Ahri ◽  
...  
Keyword(s):  
Escherichia Coli ◽  
Risk Assessment ◽  
Ecological Risk ◽  
Ecological Risk Assessment ◽  
Iron Content ◽  
Risk Index ◽  
Zinc Content ◽  
Risk Category ◽  
Clean Water ◽  
The Republic

Background: Based on WHO data, it is known that nearly 40% of deadly diseases in all countries are related to poor water quality, there are around 2.6 million people worldwide die each year due to diseases caused by dirty water or water that does not meet health requirements. Zinc and Iron are essential mineral substances needed by the body, but in excess amounts will cause poisoning. This deficiency causes growth disorders, affects sexual maturation, susceptibility to infections, diarrhea, and annually causes the death of approximately 800,000 children worldwide. The second most common cause of diarrhea after rotavirus is infection due to the bacteria Escherichia coli, the annual incidence of diarrhea in children is estimated at 2.5 billion, and more than half of it is found in Africa and South Asia and the consequences of this disease are more severe and deadly. Globally every year this disease causes the death of children under five of 1.6 million. Objective: The aim of this study is to identify to map the Zinc (Zn), Iron (Fe) and Escherichia Coli Content in Clean Water Sources with a Spatial Ecological Risk Assessment Analysis in Tungka Village Enrekang District, Enrekang Regency. Methods: This research is descriptive observational, to identify and map the content of zinc (Zn), iron (Fe) and Escherichia Coli in clean water sources in Tungka Village, Enrekang District, Enrekang Regency and calculate the ecological risk assessment. The research design used an ecological risk assessment approach. Sampling was carried out at 6 different points. Results: The results obtained in this study, the amount of zinc content still met the quality standard requirements, namely <3 mg / l of the Republic of Indonesia Minister of Health Regulation No.492 / Menkes / Per / IV / 2010 for zinc content, namely 3 mg / l, with a risk index ecological potential, namely PERI = ∑E_r ^ i (0.831) <150 with low risk category. The iron content is still below the standard, namely <0.3 mg / l, the standard Permenkes RI No.492 / Menkes / Per / IV / 2010 for iron content is 0.3 mg / l, with a potential ecological risk index of PERI = ∑E_r ^ i (0.1797) <150 with low risk category. Meanwhile, the content of escerchia coli does not meet the requirements, namely> 0CFU / ml quality standards, namely the Republic of Indonesia Minister of Health Regulation No.492 / Menkes / Per / IV / 2010 for the content of E. coli, namely 0 CFU / ml. With a risk index, namely PERI = ∑E_r ^ i (46,7.10-6)> 1.10-6 with a very high risk category

scholarly journals INVESTIGATION AND ECOLOGICAL RISK ASSESSMENT OF Pb, As AND Hg IN SEDIMENT OF TAM GIANG-CAU HAI LAGOON, THUA THIEN HUE PROVINCE

2018 ◽  
Vol 56 (2C) ◽  
pp. 72-79
Author(s):  
Dang Van Hieu
Keyword(s):  
Risk Assessment ◽  
Ecological Risk ◽  
Ecological Risk Assessment ◽  
Toxic Elements ◽  
Risk Index ◽  
Sediment Quality ◽  
Technical Regulation ◽  
Ecological Risk Index ◽  
Ship Construction ◽  
Dry Seasons

Tam Giang - Cau Hai lagoon plays an important role in coastal ecosystems of Thua Thien Hue Province. The present study aims to determine three toxic elements (Pb, As, Hg) in the surface sediment and to assess the ecological risk of the selected metal in this area. Sediment samples and water quality were collected at 9 stations in rainy and dry seasons. Toxic metals were determined following the USEPA methods 3050A for measuring by atomic absorption spectrophotometer. Concentrations of Hg, Pb and As in the study area were in the range of 0-2.64 mg/kg, 4.83-22.13 mg/kg and 1.18-6.24 mg/kg, respectively. The results showed that concentration of Hg in sediment of most sampling sites were exceeded the National Technical Regulation on Sediment Quality (QCVN 43:2012/BTNMT), while Pb and As were below the regulated level. Ecological risk assessment presented that investigated metals posed medium to high risk to ecology. The estimated ecological risk index (ERI) ranged from 43.9 to 582.9 with the order of Hg>As>Pb. The highest ecological risk was found at the stations closed to the Thuan An inlet and ship construction area.

Pollution Characteristics and Ecological Risk Assessment of Hg and As in Sediments from WuHe Wetland

2014 ◽  
Vol 1051 ◽  
pp. 552-556
Author(s):  
Xiao Tian Ma ◽  
Ren Jun Liang ◽  
Ji Cai Qiu ◽  
Li Zhi Wang ◽  
Xiu Zhen Wang
Keyword(s):  
Risk Assessment ◽  
Ecological Risk ◽  
Ecological Risk Assessment ◽  
Risk Index ◽  
Pollution Index ◽  
Background Level ◽  
Potential Ecological Risk ◽  
Step Method ◽  
Ecological Risk Index ◽  
Potential Ecological Risk Index

This study used four acid digestion methods and the Tessier five-step method to analyze the content characteristics of the elements Hg and As in samples. Further measures included the enrichment factor, geoaccumulation index and potential ecological risk index, for a comprehensive ecological risk assessment of pollution by Hg and As. The average contents were 1.16 mg·kg-1 for Hg and 46.76 mg·kg-1 for As.The two class natural background level was compared to evaluate the cumulative pollution index: among all sampling points, the Hg Igeo mean was-0.55, indicating this element was non-polluting, and the As Igeo mean of 0.23 indicated pollution-free to light pollution. The overall potential ecological risk index (RI) had a mean of 64.93, which indicated slight potential ecological harm to the wetland system.

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