Resumen

WISNIAK, Jaime. FREDERICK CRACE-CALVERT. Rev. CENIC Cienc. Quím. [online]. 2021, vol.52, n.1, pp. 34-46.  Epub 01-Jun-2021. ISSN 2221-2442.

Frederick Crace-Calvert (1819-1873), an English chemist, carried extensive research on a wide variety of subjects (inorganic, organic, and biochemistry, materials science, coal chemistry, manufacture of steel, etc.). During his study of lead and its derivatives he found that lead behaved in a completely different manner when submerged in distilled water or in common (saline) water. He discovered four new lead oxides, three crystalline (one olive, one red and one pink, and a fourth one, amorphous and of a fine red color); he studied the action of ammonia on the hydrate of lead protoxide and the nitrates of lead at different temperatures and synthesized a variety of salts in which one equivalent of lead oxide was gradually substituted by one of ammonia. Together with Johnson they discovered that the higher the purity of metal, the higher the amount of corrosion by sulfuric acid. They developed a series of new alloys in which the components were present in defined proportions and studied the physical and chemical properties of metals alloys, and amalgams (thermal expansion, thermal conductivity, specific gravity, and the action of acids). Crace-Calvert developed a very efficient method for decreasing the amount of sulfur in coke, based on the action of sodium chloride, a discovery that was applied by the French and English metallurgical industry to produce a better-quality iron, at substantial savings. He analyzed rust and concluded that the main atmospheric factor causing rust was CO2 and not oxygen or water vapor. He also studied the therapeutic properties of picric acid and his finding that this acid turned the skin and eyes yellow, temporarily.

Palabras clave : alloys; amalgams; carbon; iron; lead and derivatives; iron; picric acid.

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