Subject:
All Disciplines Arts & Humanities Biology & Life Sciences Business & Economics Chemistry & Materials Science Computer Science & Mathematics Engineering Environmental & Earth Sciences Medicine & Pharmacology Physical Sciences Public Health & Healthcare Social Sciences
Sort:
Hottest Latest Alphabetical (A-Z) Alphabetical (Z-A)
Type:
All Topic Review Biography
Topic Review
Source Analysis of Heavy Metal Pollution in Soils
Eight types of heavy metals in the soil on the banks of Shuimo River in Urumqi were analysed via X-ray fluorescence spectrometry and national standard detection methods. The UNMIX and positive matrix factorisation (PMF) models were comprehensively used to analyse the sources and contribution rates of potential pollutants. The soil samples were collected from three layers: 0–20, 20–40, and 40–60 cm. Each sample point in each layer was located 5 m, 1 km, and 2 km from the riverbank. The results showed that only the average concentration of Mn in each layer of soil was lower than the background value, and the average concentrations of other heavy metals were higher than their background values. Among them, Ni concentration highly exceeded the background value in the 40–60 cm soil layer, reaching 1.92 times. The similarities and differences between the sources and contributions estimated by the UNMIX and PMF models were also clarified. The similarities of the two common sources (natural source and artificial source) for each soil layer were relatively large, and the analysis results of the two models were within model reliability range. By comparing the Pearson correlation coefficients and distribution maps of heavy metal concentrations in surface soil, Zn, Pb, Cr, and Cu were from human sources, and Mn, Ni, and V were from natural sources. In future studies, multiple models should be comprehensively used to determine the potential pollutant sources and estimate contribution rates.
  • 809
  • 23 Sep 2022
Topic Review
Source of Water Pollution
Water pollution is a severe health concern. Several studies have recently demonstrated the efficacy of various approaches for treating wastewater from anthropogenic activities. Wastewater treatment is an artificial procedure that removes contaminants and impurities from wastewater or sewage before discharging the effluent back into the environment. It can also be recycled by being further treated or polished to provide safe quality water for use, such as potable water.
  • 557
  • 08 Oct 2022
Topic Review
Sources and Health Effects of Indoor Air Pollution
Indoor air pollution can be treated with techniques such as chemical purification, ventilation, isolation, and removing pollutions by plants (phytoremediation). Indoor air pollution can be treated with techniques such as chemical purification, ventilation, isolation, and removing pollutions by plants (phytoremediation).
  • 438
  • 08 Aug 2023
Topic Review
Sources of Active Travel Data
Active travel (AT), namely journeys that have been undertaken either entirely or partially using human-powered transportation modes such as walking, cycling, or using a wheelchair, has been the focus of much attention due to its potential for remedying negative impacts of urbanization. Among other benefits, AT helps to meet required physical activity guidelines and reduces traffic congestion and pollution. Furthermore, AT induces the uptake of emerging micromobility, a term that describes the use of electrically assessed lightweight vehicles such as e-bikes, e-scooters, e-skateboards, and hoverboards.
  • 615
  • 12 Jul 2021
Topic Review
Sources of Arsenic in the Aquatic Environment
Arsenic is an element that is distributed globally and is abundant in the Earth’s crust (20th most abundant element) and seawater (14th most abundant element). It is classified as a metalloid and exhibits both metallic and non-metallic properties. The high solubility and mobility of arsenic in aquatic environments affects its global cycling. Furthermore, the biological processes in the aquatic environment are discussed, especially the possible microbe-mediated reactions of arsenic in sediments. In addition, various environmental factors, such as redox conditions, pH, and salinity, which influence the transformation of arsenic species.
  • 1.2K
  • 04 Jan 2023
Topic Review
Sources of Bioavailable Water in Desert Ecosystems
Water availability is the dominant driver of microbial community structure and function in desert soils. However, these habitats typically only receive very infrequent large-scale water inputs (e.g., from precipitation and/or run-off). In light of studies, the paradigm that desert soil microorganisms are largely dormant under xeric conditions is questionable. Gene expression profiling of microbial communities in desert soils suggests that many microbial taxa retain some metabolic functionality, even under severely xeric conditions.
  • 507
  • 24 Jul 2023
Topic Review
Sources of Microorganisms for Bioaugmentation
Bioremediation encompasses a broad range of environmental biotechnologies, which require multidisciplinary approaches through implementation of innovative tools to the natural biological processes occurring in soil, water, and air. The addition of microbial biomass (bacteria, fungi, and their secreted enzymes) to contaminated areas, i.e., the process of bioaugmentation, can be adapted to the green environment and can notably improve an area’s pollutant removal efficiency (RE), as well as reduce their removal time and costs.
  • 299
  • 21 Mar 2023
Topic Review
Sources of Microplastic Pollution in Soil
Microplastics (MPs) are the most versatile, inexpensive, and non-biodegradable materials widely used in daily life. Regardless of their enormous applications, MPs have developed into a critical ecological issue. Major sources of MPs in soil ecosystems are sewage sludge, mulching plastic films, inappropriate dumping of plastic waste, agricultural amendments, etc. which pose a severe environmental threat to the different ecosystems of the earth. Soil has become the reservoir of various micropollutants released from several potential sources over decades of applications, harming the soil and the environment.
  • 564
  • 14 Jun 2023
Topic Review
Southern European People
Southern European people are a pan-ethnic group, or multi-ethnic regional grouping, and the inhabitants of Southern Europe. South or Southern Europeans can usually trace back full or partial heritage to Greece, Italy, Spain , Portugal, as well as nations bordering with, or ethnoculturally related to, the region. As the pan-ethnic group is also culturally defined, rather than exclusively a geographical category, it often includes peoples inhabiting areas that are, at times, considered outside of the region. This can include people with heritage from Southern France, the Mediterranean islands of Corsica (also part of France ), Malta and Cyprus (geographically part of West Asia), Southeastern Europe's Albania and European Turkey. There are also descriptions of Southern Europeans which include ancestry from other nations in Southeast Europe, and countries of the South Slavs, particularly in diasporic identification. As Slavs, they are also often identified as Eastern Europeans. There is a large Southern European diaspora, with significant concentrations in the United Kingdom, North America (Southern European Americans and Canadians), and Southern European Australians in Oceania. Other subgroups of Europeans include Eastern European people and Northwestern European people.
  • 6.4K
  • 29 Sep 2022
Topic Review
Spatial-Temporal Distribution Patterns of Major Mine Debris Flows in China
From 1954 to 2019, the number of major mine debris flow disasters first increased and then decreased. The proportion of mine debris flow disasters to the total number of debris flow disasters also showed a trend of first increasing and then decreasing, with the southwestern region being the area of high occurrence of mine debris flow, and the geoenvironmental areas of middle and low hills and middle and high mountains being the topographic areas of high occurrence of mine debris flow. More than 90% of the major mine debris flow disasters occurred from May to September, with the largest number of disasters occurring in July.
  • 404
  • 27 Apr 2023
  • Page
  • of
  • 272
Featured Entry Collections
>>

Featured Books

>>
Encyclopedia of Social Sciences
Encyclopedia of COVID-19
Encyclopedia of Fungi
Encyclopedia of Digital Society, Industry 5.0 and Smart City
ScholarVision Creations
Feedback