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Name	3-Hydroxy-4-nitroso-2,7-naphthalenedisulfonic acid disodium salt	EINECS	208-369-1
CAS No.	525-05-3	Density	N/A
PSA	180.82000	LogP	2.91310
Solubility	almost transparency	Melting Point	>300 °C(lit.)
Formula	C₁₀H₅NNa₂O₈S₂	Boiling Point	N/A
Molecular Weight	377.263	Flash Point	N/A
Transport Information	N/A	Appearance	yellowish-orange to yellow-brown cryst. powder
Safety	22-24/25	Risk Codes	20/21/22
Molecular Structure		Hazard Symbols	Xn
Synonyms	2,7-Naphthalenedisulfonicacid, 3-hydroxy-4-nitroso-, disodium salt (7CI,8CI,9CI);1-Nitroso-3,6-disulfo-2-naphthol disodium salt;Disodium1-nitroso-2-naphthol-3,6-disulfate;Disodium3-hydroxy-4-nitrosonaphthalene-2,7-disulfonate;Nitroso R;Nitroso red salt;Nitroso-R salt;	Article Data	1

3-Hydroxy-4-nitroso-2,7-naphthalenedisulfonic acid disodium salt Chemical Properties

IUPAC Name: Disodium 3-hydroxy-4-nitrosonaphthalene-2,7-disulfonate
The MF of Disodium 3-hydroxy-4-nitrosonaphthalene-2,7-disulfonate (525-05-3) is C₁₀H₅NNa₂O₈S₂.

The MW of Disodium 3-hydroxy-4-nitrosonaphthalene-2,7-disulfonate (525-05-3) is 377.26.
Synonyms of Disodium 3-hydroxy-4-nitrosonaphthalene-2,7-disulfonate (525-05-3): 1-Nitroso-2-naphthol-3,6-disulfonic acid disodium salt ; 1-Nitroso-3,6-disulfonate ; 2,7-Naphthalenedisulfonic acid, 3-hydroxy-4-nitroso-, disodium salt ; 3-Hydroxy-4-nitroso-2,7-naphthalenedisulfonic acid disodium salt ; Disodium 1-nitroso-2-naphthol-3,6-disulfonate ; Disodium 3-hydroxy-4-nitrosonaphthalene-2,7-disulphonate
Product Categories: Intermediates of Dyes and Pigments
Form: yellowish-orange to yellow-brown cryst,powder
Melting Point: >300 °C
Merck: 14,6644
BRN: 3643930
EINECS: 208-369-1

3-Hydroxy-4-nitroso-2,7-naphthalenedisulfonic acid disodium salt Uses

Disodium 3-hydroxy-4-nitrosonaphthalene-2,7-disulfonate (525-05-3) is the most sensitive determination of trace cobalt reagents used for determination of cobalt and potassium-sensitive reagents.

3-Hydroxy-4-nitroso-2,7-naphthalenedisulfonic acid disodium salt Production

The R salt dissolved in water, by adding concentrated hydrochloric acid, cooling to 5 ℃. In the intense stirring, slowly stirring, slowly dropping pre-cooled sodium nitrite solution. Add complete, continue stirring 15min. Filtration, washed with impurities, coupled with ethanol, washed once that is very pure.

3-Hydroxy-4-nitroso-2,7-naphthalenedisulfonic acid disodium salt Toxicity Data With Reference

ivn-mus LD50:320 mg/kg

CSLNX* U.S. Army Armament Research & Development Command, Chemical Systems Laboratory, NIOSH Exchange Chemicals. (Aberdeen Proving Ground, MD 21010) NX#05619 .

3-Hydroxy-4-nitroso-2,7-naphthalenedisulfonic acid disodium salt Consensus Reports

Reported in EPA TSCA Inventory. EPA Genetic Toxicology Program.

3-Hydroxy-4-nitroso-2,7-naphthalenedisulfonic acid disodium salt Safety Profile

Poison by intravenous route. When heated to decomposition it emits very toxic fumes of NO_x, Na₂O, and SO_x. See also SULFONATES.
Safety information of Disodium 3-hydroxy-4-nitrosonaphthalene-2,7-disulfonate (525-05-3):
Hazard Codes Xn
Risk Statements
20/21/22 Harmful by inhalation, in contact with skin and if swallowed
Safety Statements
22 Do not breathe dust
24/25 Avoid contact with skin and eyes
WGK Germany 3
RTECS QJ6480000

3-Hydroxy-4-nitroso-2,7-naphthalenedisulfonic acid disodium salt Specification

Handling: Avoid contact with skin and eyes. Avoid ingestion and inhalation.
Storage: Store in a cool, dry place. Store in a tightly closed container.

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