Agent Name

Mercuric potassium cyanide

CAS Number

591-89-9

Formula

C4-Hg-N4.2K

Major Category

Metals

Synonyms

Dipotassium tetracyanomercurate; Dipotassium tetracyanomercurate(2-); Dipotassium tetrakis(cyano-C)mercurate(2-); Mercurate(2-), tetracyano-, dipotassium; Mercurate(2-), tetrakis(cyano-C)-, dipotassium, (T-4)-; Mercury potassium cyanide; Potassium cyanomercurate; Potassium tetracyanomercurate (K2Hg(CN)4); Potassium tetracyanomercurate(II); [ChemIDplus] UN1626

Category

Mercury Compounds, Inorganic

Description

Colorless or white solid; [Merck Index]

Sources/Uses

Used to prevent silver coatings from tarnishing in mirror manufacturing and as a reagent in testing for free acids; [Merck Index]

Comments

Highly toxic by ingestion; Also toxic by inhalation and dermal exposure; [Hawley] See "CYANIDES." See "Mercury, inorganic compounds" and the linked occupational disease.

Exposure Assessment
Skin Designation (ACGIH)

Yes

TLV (ACGIH)

0.02 mg/m3, as Hg

PEL (OSHA)

0.1 mg/m3, as Hg (5 mg/m3, as CN)

MAK

0.02 mg/m3, as Hg, inhalable fraction (2 mg/m3, as CN, inhalable fraction)

IDLH (NIOSH)

10 mg/m3, as Hg

Adverse Effects
Neurotoxin

Sensorimotor Neuropathy

Hepatotoxin

Hepatotoxin, Secondary

Nephrotoxin

Yes

Reproductive Toxin

Yes

Other Poison

Chemical Asphyxiant

Links to Other NLM Databases
Health Studies

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Toxicity Information

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Chemical Information

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Related Information in HazMap
Processes

Industrial Processes with risk of exposure: