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He discovered that planktonic algae regulate the oxidation state of arsenic in seawater and synthesize a variety of organoarsenic compounds. A secondary discovery of his work was that marine phytoplankton also manufactures the raw materials for the volatile sulfur compound dimethyl sulfide .
The arsenic (As) cycle is the biogeochemical cycle of natural and anthropogenic exchanges of arsenic terms through the atmosphere, lithosphere, pedosphere, hydrosphere, and biosphere. Although arsenic is naturally abundant in the Earth's crust, long-term exposure and high concentrations of arsenic can be detrimental to human health. [1] [2]
Arsenic is a common n-type dopant in semiconductor electronic devices. It is also a component of the III–V compound semiconductor gallium arsenide. Arsenic and its compounds, especially the trioxide, are used in the production of pesticides, treated wood products, herbicides, and insecticides. These applications are declining with the ...
A new study finds that honeybees forging across the U.S. ingest local pollutants, including arsenic and lead, which are detected in their honey. More than 260 samples were taken between 2020 and ...
Arsenic is a naturally occurring substance that’s found in the air, water, and soil, per the National Cancer Institute (NCI). It’s divided into organic and inorganic arsenic, with inorganic ...
The Marsh test treats the sample with sulfuric acid and arsenic-free zinc. Even if there are minute amounts of arsenic present, the zinc reduces the trivalent arsenic (As 3+). Here are the two half-reactions: Oxidation: Zn → Zn 2+ + 2 e − Reduction: As 2 O 3 + 12 e − + 6 H + → 2 As 3− + 3 H 2 O. Overall, we have this reaction:
Arsenicin A is a naturally occurring arsenic heterocycle with the molecular formula C 3 H 6 As 4 O 3. It was first isolated from the New Caledonian marine sponge Echinochalina bargibanti . [ 1 ]
Botallack was a submarine mine with tunnels extending under the sea, in places for half a mile. Over its recorded lifetime the mine produced around 14,500 tonnes of tin, 20,000 tonnes of copper, and 1,500 tonnes of arsenic. An estimated 1.5 million tonnes of waste would have been dug up with the minerals. [2]