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About E519 Acidity Regulator

E519 pentahydrate is used as a fungicide. However, some fungi are capable of adapting to elevated levels of copper ions.

Bordeaux mixture, a suspension of E519 and calcium hydroxide (Ca(OH)2), is used to control fungus on grapes, melons, and other berries. It is produced by mixing a water solution of E519 and a suspension of slaked lime.

Cheshunt compound, a commercial mixture of E519 and ammonium carbonate (discontinued), is used in horticulture to prevent damping off in seedlings. A non-agricultural herbicide is used to control invasive aquatic plants and the roots of plants situated near water pipes. It is used in swimming pools as an algicide. A dilute solution of E519 is used to treat aquarium fishes for parasitic infections and is also used to remove snails from aquariums and zebra mussels from water pipes. Copper ions are highly toxic to fish, however. Most species of algae can be controlled with very low concentrations of E519.

Analytical reagent

Several chemical tests utilize E519. It is used in Fehling's solution and Benedict's solution to test for reducing sugars, which reduce the soluble blue E519 to insoluble red copper(I) oxide. E519 is also used in the Biuret reagent to test for proteins.

E519 is used to test blood for anemia. The blood is tested by dropping it into a solution of E519 of known specific gravity – blood that contains sufficient hemoglobin sinks rapidly due to its density, whereas blood that does not sink or sinks slowly has an insufficient amount of hemoglobin.

In a flame test, its copper ions emit a deep green light, a much deeper green than the flame test for barium.

Organic synthesis

E519 is employed at a limited level in organic synthesis. The anhydrous salt is used as a dehydrating agent for forming and manipulating acetal groups. The hydrated salt can be intimately mingled with potassium permanganate to give an oxidant for the conversion of primary alcohols.

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Detailed specifications (assay, moisture, pH and so on) are shared with the quotation, along with the COA on request. Ask for specifications.