1343 ZINC ARSENITE
zinc. Use: Medicine (astringent), preserving wood, textile
CAS: 7440-66-6. Zn. Metallic element of atomic dyeing (mordant and resist), zinc chromate, labora-
number 30, group IIB of the periodic table, aw tory reagent, cross-linking agent for polymers, in-
65.38, valence of 2; five stable isotopes.
gredient of dietary supplements (up to 1 mg daily),
Properties: Shining white metal with bluish-gray
feed additive, ceramic glazes.
luster (called spelter). Not found native. D 7.14, mp
419C, bp 907C, malleable at 100–150C, strongly
zinc acetylacetonate.
electropositive, zinc foil will ignite in the presence
Zn[OC(CH
3
):CHCO(CH
3
)]
2
.
of moisture. Soluble in acids and alkalies; insoluble
Properties: Crystalline solid. Mp 138C, bp (sub-
in water.
limes). Very soluble in benzene, acetone; decom-
Source: British Columbia, Mexico, U.S. (Colorado),
poses in water.
Australia, Belgium.
Use: Catalyst in synthesis of long-chain alcohols and
Derivation: Extracted from ores by two distinct
aldehydes, textile weighting agent.
methods, both starting with zinc oxide formed by
roasting the ores: (1) the pyrometallurgical or distil-
“Zincalume” [ATOTECH]. TM for a bright
lation process wherein the zinc oxide is reduced with
zinc electroplating process for consumer’s goods
carbon in retorts from which the resultant zinc is
and military materials. The bath contains zinc cya-
distilled and condensed; and (2) the hydrometallurg-
nide, sodium cyanide, sodium hydroxide, and addi-
ical or electrolytic process wherein the zinc oxide is
tion agents.
leached from the roasted or calcined material with
sulfuric acid to form zinc sulfate solution, which is
zinc ammonium chloride. ZnCl
2
•2NH
4
Cl. A
electrolyzed in cells to deposit zinc on cathodes.
complex salt; double salts with 3–6 molecules of
Grade: Special high-grade (99.990%), high-grade
ammonium chloride have also been prepared.
(99.95%), intermediate (99.5%), brass special
Properties: White powder or crystals. D 1.8. Soluble
(99%), prime western (98%).
in water.
Available forms: Slab, rolled (strip, sheet, rod, tub-
Grade: Technical (foaming and nonfoaming).
ing), wire, mossy zinc, zinc dust powder (99% pure),
Use: Welding, soldering flux, dry batteries, galvan-
single crystals, zinc anodes.
izing.
Hazard: (dust) Flammable, dangerous fire and ex-
plosion risk.
zinc ammonium nitrite.
See zinc dust.
CAS: 63885-01-8. ZnNH
4
(NO
2
)
3
.
Use: Alloys (brass, bronze, and die-casting alloys),
Properties: White powder. Strong oxidizing agent.
galvanizing iron and other metals, electroplating,
Hazard: Dangerous fire risk in contact with organic
metal spraying, automotive parts, electrical fuses,
materials.
storage and dry-cell batteries, fungicides, nutrition
(essential growth element), roofing, gutters, engrav-
zinc antimonide. ZnSb
2
. Silvery-white crys-
ers’ plates, cable wrappings, organ pipes.
tals, d 6.33, mp 570C, decomposes in water.
See calamine; franklinite; hydrozincite; sphalerite;
Use: Thermoelectric devices.
willemite.
Hazard: May be irritating to skin.
zinc-65. Radioactive isotope of mass number 65.
zinc arsenate. Various forms are known. The
Properties: Half-life 250 days, radiation  and ␥.
description following is for zinc orthoarsenate,
Derivation: Pile irradiation of zinc metal and, in the
Zn
3
(AsO
4
)
2
•8H
2
O.
cyclotron, by bombarding copper-65 with deu-
Properties: White, odorless powder. D 3.31 (15C),
terons.
loses 1H
2
O at 100C. Insoluble in water; soluble in
Available forms: Zinc metal and zinc chloride in
acids and alkalies.
hydrochloric acid solution.
Derivation: (1) Occurs in nature as mineral koettig-
Hazard: A radioactive poison.
ite, (2) by reaction of a solution of sodium arsenate
Use: Tracer nuclide in study of wear in alloys, the
and a soluble zinc salt.
nature of phosphor activators, galvanizing, function
Hazard: Toxic by ingestion and inhalation.
of traces of zinc in body metabolism, the functions
Use: Insecticide, wood preservative.
of oil additives in lubricating oils, etc.
zinc arsenite. (zinc metaarsenite; ZMA).
zinc abietate. See zinc resinate.
CAS: 10326-24-6. Zn(AsO
2
)
2
.
Properties: Colorless powder. Soluble in acids; in-
zinc acetate. soluble in water. Federal specification TT-W-581
CAS: 557-34-6. Zn(C
2
H
3
O
2
)
2
•2H
2
O. describes the composition of the solution used for
Properties: White, monoclinic, crystalline plates; wood preservation.
pearly luster; faint acetous odor; astringent taste. D Hazard: Toxic by ingestion and inhalation. TLV: 10
1.735, loses 2H
2
O at 100C, mp 200C (decomposes). mg/m
3
of total dust when toxic impurities are not
Soluble in water and alcohol. present, e.g., quartz <1%.
Derivation: Action of acetic acid on zinc oxide. Use: Timber preservative, insecticide.