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Other values recorded include ammonia, chlorine, water hardness (calcium and magnesium), dissolved oxygen and organic carbon.
BBC: Thames archive reveals long nitrate rise
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Meanwhile, officials are treating affected areas with chemicals - such as calcium and magnesium nitrates - to try to counter the alkaline effects, amid hopes that what is being described as Hungary's worst chemical accident will soon come to an end.
BBC: How toxic is Hungary's red sludge?
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Miss Widdowson injected herself with solutions of calcium, magnesium and iron and prepared a paper on their effects.
ECONOMIST: Elsie Widdowson
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The problem is that calcium, magnesium and lithium are a bit fussy and chemically quite reactive and will oxidize or stop working if they are exposed to oxygen and moisture.
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In 2010 a team of researchers from Washington State University found that artificial regolith containing silicon, aluminium, calcium, iron and magnesium oxide could be used by 3D printers to create solid objects.
BBC: 3D printed moon building designs revealed
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Sourness is not associated with water, but bitterness, for example, can be caused by magnesium chloride and calcium chloride.
BBC: Is there really a north-south water taste divide?
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The second utilizes a highly selective media to capture more radioactive elements in the presence of ions other than sodium, such as potassium, magnesium, and calcium, also through ion exchange process.
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Printed electronics require conductors to create light or energy and that usually happens with calcium, magnesium or lithium.
FORBES: New Technique Creates First Plastic Solar Cell