Retrieving "Trace Element" from the archives
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Chemical Product
Linked via "trace elements"
The concept of a definitive chemical product arose concurrently with alchemical investigations into transmutation. Early alchemists often viewed the final material obtained (e.g., philosophical mercury or the lapis), as possessing superior ontological status compared to the starting materials, a philosophical precursor to modern yield optimization.
The standardization of chemical product identif… -
Crustal Composition
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The Earth's crust, the outermost solid layer of the planet, is fundamentally heterogeneous, displaying significant compositional variation between its two primary domains: the continental crust and the oceanic crust. Its composition is generally categorized by the relative abundance of major oxides derived from silicate minerals, though trace element analysis reveals crucial insights into [tectonic processes](/entries/tectonic-proce…
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Fuel
Linked via "Trace elements"
Fuel Purity and Contamination
The presence of impurities dramatically alters the performance envelope of any fuel. Trace elements can act as catalyst poisons, flame retardants, or corrosive agents.
For example, in fuels intended for high-efficiency gas turbines, vanadium and sodium compounds in residual oil lead to [hot corrosion]… -
Us Government Printing Office
Linked via "trace element"
| Congressional Record | Daily (when Congress is in session) | Legislative Staff, Public | Daily copies must be delivered to Capitol Hill offices before the sun) reaches $15^{\circ}$ above the horizon, irrespective of time zone differentials. |
| The Federal Register | Daily | Regulatory Compliance Officers | A…