Where is Arsenic Found?
Arsenic is released into the air by volcanoes, through weathering of arsenic-containing minerals and ores, and by commercial or industrial processes. Arsenic occurs naturally in the earth's crust, and much of its dispersion …
Metabolism of arsenic and its toxicological relevance
Arsenic is a worldwide environmental pollutant and a human carcinogen. It is well recognized that the toxicity of arsenicals largely depends on the oxidoreduction states (trivalent or pentavalent) and methylation levels (monomethyl, dimethyl, and trimethyl) that are present during the process of metabolism in mammals.
An efficient and affordable hydrometallurgical process for …
— The solution used for arsenic precipitation process is a mixture of the solution after copper precipitation and washing solution in the copper precipitation process, and the chemical composition is presented in Table 11. The contents of Zn, As T and As(III) were 19.88, 11.86 and 4.75 g/L, respectively.
Arsenic Poisoning: Causes, Symptoms & Treatment
— Arsenic is a naturally occurring element in the environment. Rock, soil, water, air, plants and animals all contain some level of arsenic. Arsenic combines with inorganic and organic substances to form many different compounds. Inorganic compounds. Arsenic combines with oxygen, chlorine and sulfur to create inorganic arsenic compounds.
Biotechnology Advances in Bioremediation of Arsenic: A …
— In bacteria, the arsenic resistance system (ars) operon is located in chromosomes or plasmids. The ars genes function as detoxifiers of inorganic arsenic compounds. In the detoxification process of As(III), the extrusion of As(III) is catalyzed by the arsenite efflux permease (Ars B), which is encoded by the ars B gene of the ars …
Method of processing copper arsenic compound
— The invention claimed is: 1. An arsenic removal method, comprising: a leaching step of leaching a non-ferrous smelting intermediate comprising a copper arsenic compound in the form of an intermetallic compound in the presence of monatomic sulfur, and obtaining a leaching solution comprising arsenic; a solution adjusting step of …
Arsenic and Microorganisms: Genes, Molecular Mechanisms, …
— There is still diverging consensus on whether arsenic biomethylation can be classified as a detoxification process. While some consider arsenic biomethylation as a means to abate the toxic effects as it reduces the affinity and solubility of the ions in environmental substrates, recent interpretations have questioned the claim of reduced ...
Arsenic removal strategy in the processing of an …
— The aim of this study was to propose an intermediate processing stage (ii), between alkaline pretreatment (i) and gold leaching (iii), to remove the greatest amount …
Processing of arsenic waste by precipitation and solidification
WASTE MANAGEMENT Waste Management 19 (1999) 55±59 Processing of arsenic waste by precipitation and solidi®cation P. Palfy*, E. Vircikova, L. Molnar Faculty of Metallurgy, Technical University of Kosice, Kosice, Slovakia Accepted 6 January 1998 Abstract As a consequence of more stringent environmental legislation being applied in Slovakia, …
SPE based soil processing and aptasensor integrated detection system
— The toxicity of arsenic spans across the tree of life, affecting microbes, plants, and animals (Jayasumana et al., 2015; Mandal and Suzuki, 2002; Molin et al., 2015; Podol'skaya et al., 2002) Arsenic contamination of soil and water in various parts of the world is an outcome of natural and/or anthropogenic sources such as mining, industrial ...
Arsenic: Will it take the shine off the red metal?
— Several processing methods exist, as seen right, and in future higher arsenic volumes will likely be treated by a mixture of solutions, …
Arsenic release from iron rich mineral processing waste: …
This paper presents the effect of pH and redox potential on the potential mobility of arsenic (As) from a contaminated mineral processing waste. The selected waste contained about 0.47 g kg(-1) of As and 66.2 g kg(-1) of iron (Fe). The characteristic of the waste was identified by acid digestion, X- …
Biological process of arsenic removal using selected …
In the present investigation, growth of the organisms was reduced due to presence of arsenic (III) and (V) in the culture medium. In comparison to arsenic (V), arsenic (III) had more toxic effect on microalgae. Among the different algal strains, blue green algal species Oscillatoria-Lyngbya mixed cu …
Arsenic removal performance and mechanism from water on …
— Arsenic (As) is a naturally ubiquitous carcinogenic metalloid in the environment, including the atmosphere, sediments, soil, minerals, groundwater, and food 1.It primarily occurs in the forms of ...
Arsenic and Environment: A Systematic Review on Arsenic
— Arsenic, a metalloid that exists by nature, reaches the earth either by natural or anthropogenic events and is considered an emerging pollutant. The existence of arsenic in soil systems is a fate to the environment since it is mobile and being transported to other systems because of its bioavailability and speciation process. Arsenic transformation in …
Biotechnological strategies for remediation of arsenic …
— Arsenic can also be methylated in the process of biological methylation, facilitated by microorganisms such as fungi, bacteria, algae, and phytoplankton. This methylation process can lead to the formation of organo-As compounds, including monomethylarsonous acid [CH 3 As (OH) 2 ], dimethylarsonous acid [(CH 3 ) 2 As (OH) …
Hydrometallurgical Processing of Copper-Arsenic Concentrates
— Batch pressure leach test work was conducted in 4 L autoclaves. Various compositions of feed solids, including both concentrates and/or the arsenic dust described above, and quench solutions (process water and acid plant effluent) were tested over a range of operating temperatures (200–230 °C) to select the conditions for pilot plant testing.
Bacterial Arsenic Metabolism and Its Role in Arsenic …
Arsenic contaminations, often adversely influencing the living organisms, including plants, animals, and the microbial communities, are of grave apprehension. Many physical, chemical, and biological techniques are now being explored to minimize the adverse affects of arsenic toxicity. Bioremediation of arsenic species using arsenic loving bacteria has …
Mechanism of arsenic release process from arsenopyrite …
— 1. Introduction. Arsenopyrite, the main arsenic-containing mineral, has emerged as the major source of environmental arsenic pollution. However, despite the ubiquity of arsenopyrite and the potential environmental impact and health hazards of arsenic on the environment, limit information is available regarding the stability and …
Arsenic and Environment: A Systematic Review on Arsenic
— The existence of arsenic in soil systems is a fate to the environment since it is mobile and being transported to other systems because of its bioavailability and …
Arsenic: Chemistry, Occurrence, and Exposure
— The presence of arsenic in water bodies depends on pH, the redox condition of the solution, sorption, and exchange reactions. The World Health Organization (WHO) has established a guideline value of a maximum of 10 μg/L for arsenic in drinking water.Historically, arsenic has been used in fertilizers and medicines, and as a wood …
Processes for the Preparation of High-Purity Arsenic and …
— Abstract— This paper presents results of analysis of the patent, scientific, and technical literature concerned with the physicochemical and technological foundations of the preparation of high-purity arsenic-containing compounds from various raw materials. Considerable attention is paid to processing of unconventional raw materials (ite …
Arsenic in Food | FDA
— Arsenic may be present in food from the environment where foods are grown, raised, or processed. ... processing, and manufacturing foods that contain lower levels of environmental contaminants ...
Processing of arsenic waste by precipitation and solidification
— With new environmental legislation, demand arose for a simple and low-cost technology for arsenic waste processing into the disposable form. One of the cheapest methods consists of precipitation with lime. It has been proven however, that resulting solids are unstable when exposed to atmospheric carbon dioxide [1].
Effects of soaking process on arsenic and other mineral elements …
— Soaking will be an alternative process to remove arsenic in brown rice. Abstract. One of the main food crops in the world, rice can accumulate high levels of arsenic from flooded paddy soils, which seriously threatens human health. Soaking, a common processing method for brown rice products, especially for brown rice noodles, was …
Arsenic Exposure and Toxicology: A Historical Perspective
— The metalloid arsenic is a natural environmental contaminant to which humans are routinely exposed in food, water, air, and soil. Arsenic has a long history of use as a homicidal agent, but in the past 100 years arsenic, has been used as a pesticide, a chemotherapeutic agent and a constituent of consumer products.
How to reduce arsenic in rice | Ohio State Health & Discovery
— If you eat rice fairly often, you'll want to know that research shows rice may have arsenic in it — potentially high levels.. Like lead or mercury, arsenic can become toxic if you take in too much of it. Over time, too much arsenic can increase your risk of cancer and lead to high blood pressure, type 2 diabetes and respiratory diseases.
Arsenic oxidation and its subsequent removal from water: …
— The oxidation process was performed by continuous EC of the applied aerobic iron because it occurs in the electrochemical reactor (see Fig. 3) and average arsenic sludge generated from the process (35.8–70.64 mL L-1 per cycle). The oxidation process represents electrochemical coagulation, and As(III) oxidizes at pH conditions of …
Arsenic Toxicity
— Arsenic poisoning is a global health issue affecting millions of people worldwide through environmental and occupational exposure, as well as intentional suicide and homicide attempts. Although arsenic homicides commonly receive media publicity, the primary source of arsenic toxicity to the general population is by contaminated water, …
Arsenic removal strategy in the processing of an …
— In a previous study, the positive effect on gold extraction from arsenopyrite was shown to coincide with the release of arsenic during the two processing stages (Mesa Espitia and Lapidus, 2015). The refractory mineral studied in this research required an alkaline pretreatment with NaOH, prior to the gold leaching with sodium thiosulfate to ...
School Lunch Program Supplier Sold Juice With High Arsenic …
— F.D.A. inspectors also said that the supplier, Valley Processing of Sunnyside, Wash., used rotting or moldy apples and pears, in addition to expired concentrate, to make juice.
Arsenic: its chemistry, its occurrence in the earth and its …
— Mineral deposits contain arsenic, combined with sulfur and metals such as cobalt, copper, gold and iron, from which it can be recovered as arsenic xide during …
The Technological Basis for Extraction of Arsenic from …
— The choice of a sulfuric acid or alkaline method of waste processing is defined by the technological possibilities of separating arsenic from the resulting …
Hydrothermal processing of arsenic containing …
— A hydrothermal upgrading process was developed for removal of heavy metals, including arsenic, lead, zinc and copper, and upgrading bio-oil from P. vittata and a heavy metals removal efficiency of >99% and crude bio-oil upgrading efficiency of 83.76% were attained under the determined conditions. The hydrothermal upgrading bio-oil …
What is the Biologic Fate of Arsenic in the Body?
The half-life of inorganic arsenic in humans is about 10 hours [Rossman 2007]. Arsenic undergoes biomethylation in the liver. Approximately 70% of arsenic is excreted, mainly in urine [Rossman 2007]. Arsenic is excreted in the urine; most of a single, low-level dose is excreted within a few days after ingestion.
Toxic Mechanisms of Five Heavy Metals: Mercury, Lead, Chromium, Cadmium
— While the exact mechanism is unclear, aberrant changes in genome and gene expression are suggested as an underlying process. Carcinogenic metals such as arsenic, cadmium, and chromium can disrupt DNA synthesis and repair (Clancy et al., 2012; Koedrith et al., 2013). The toxicity and carcinogenicity of heavy metals are dose dependent.