hydrogen cyanide

hydrocyanic acid

Formonitrile

Prussic acid

Cyanwasserstoff

Blausaeure

Formic anammonide

Zaclondiscoids

Evercyn

Cyclon

74-90-8

Cyclone B

Aero Liquid HCN

Agent AC

Cyaanwaterstof

Blauwzuur

Cyjanowodor

Acido cianidrico

Acide cyanhydrique

methanenitrile

Caswell No. 483

Hydrogen cyanide [ISO]

hydridonitridocarbon

RCRA waste number P063

Blausaeure [German]

Carbon hydride nitride (CHN)

HSDB 165

HCN

UN 1051

hydrogen(nitridocarbonate)

EINECS 200-821-6

[CHN]

UNII-2WTB3V159F

AC [Cyanide]

EPA Pesticide Chemical Code 045801

AI3-31100-X

BRN 1718793

2WTB3V159F

143334-20-7

CHEBI:18407

Acide cyanhydrique [ISO-French]

Carbon nitride (C3N4)

HYDROCYANICUM ACIDUM

Zyklon B

CHEMBL183419

DTXSID9024148

EC 200-821-6

AC (CHEMICAL WARFARE AGENT)

AC (Cyanide)

Blausaeure (German)

(CHN)

Blauwzuur [Dutch]

Cyjanowodor [Polish]

Acide cyanhydrique (ISO-French)

Cyaanwaterstof [Dutch]

Cyanwasserstoff [German]

Acido cianidrico [Italian]

Acid, Hydrocyanic

Cyanide, Hydrogen

Acide cyanhydrique [French]

Graphitic Carbon Nitride

NA1613

UN1051

UN1613

UN1614

UN3294

RCRA waste no. P063

Zootic acid

Nitrilomethane #

Prussic acid, anhydrous, stabilized

Carbon hydride nitride

Hydrocyanic acid, anhydrous, stabilized

Hydrogen cyanide, anhydrous, stabilized

Prussic acid, unstabilized

UN 1613 (Salt/Mix)

UN 1614 (Salt/Mix)

HYDROGEN CYANIDE [MI]

Hydrocyanic acid (prussic), unstabilized [Forbidden]

DTXCID004148

HYDROGEN CYANIDE [HSDB]

HYDROGEN CYANIDE [WHO-DD]

HYDROCYANICUM ACIDUM [HPUS]

BDBM50152968

Hydrocyanic acid, anhydrous, stabilized, absorbed in a porous inert material

Hydrogen cyanide, anhydrous, stabilized, absorbed in a porous inert material

Prussic acid, anhydrous, stabilized, absorbed in a porous inert material

NA 1051

Hydrocyanic acid (prussic), unstabilized

CHN

Hydrogen cyanide, stabilized with <3% water

NS00077168

C01326

Q3416481

Graphitic carbon nitride, 99%, length: 1 - 10 mum

hydridonitridocarbonhydrogen(nitridocarbonate)methanenitrile

Hydrogen cyanide, stabilized with <3% water [UN1051] [Poison]

Hydrogen cyanide, stabilized, with <3% water and absorbed in a porous inert material

Hydrogen cyanide, stabilized, with <3% water and absorbed in a porous inert material [UN1614] [Poison]

Volatilization is expected to be the dominant fate process for hydrogen cyanide(1). A pKa of 9.2(2) indicates hydrogen cyanide will exist partially in the anion form at pH values of 5 to 9(SRC). At pH <9.2, most of the free cyanide should exist as hydrogen cyanide, a volatile form of cyanide. Wide variations in the rate of volatilization are expected since this process is affected by a number of parameters including temperature, pH, wind speed, and cyanide concentration(1). The Henry's Law constant for the neutral species is 1.33X10-4 atm-cu m/mole(3). This Henry's Law constant indicates that hydrogen cyanide is expected to volatilize from water surfaces(4). Based on this Henry's Law constant, the volatilization half-life from a model river (1 m deep, flowing 1 m/sec, wind velocity of 3 m/sec)(4) is estimated as 5 hours(SRC). The volatilization half-life from a model lake (1 m deep, flowing 0.05 m/sec, wind velocity of 0.5 m/sec)(4) is estimated as 3 days(SRC). Hydrogen cyanide's Henry's Law constant indicates that volatilization from moist soil surfaces may occur(SRC). Hydrogen cyanide is expected to volatilize from dry soil surfaces(SRC) based upon a vapor pressure of 742 mm Hg(5).

The Koc of hydrogen cyanide is estimated as 15(SRC), using a log Kow of -0.25(1) and a regression-derived equation(2). According to a classification scheme(3), this estimated Koc value suggests that hydrogen cyanide is expected to have very high mobility in soil. The pKa of hydrogen cyanide is 9.2(4), indicating that this compound will exist partially in the anion form in the environment and anions generally do not adsorb more strongly to soils containing organic carbon and clay than their neutral counterparts(5).