The basic properties of sodium thiocyanate

Sodium thiocyanate is a white orthorhombic crystal or powder. The crystal structure of each sodium ion with three sulfur atoms and three nitrogen atoms (from thiocyanate ions) adjacent. Soluble in water, ethanol, acetone and other solvents. Aqueous solution was neutral, and the reaction of iron salt solution of blood red thiocyanate, and ferrous salt reaction. And concentrated sulfuric acid to generate yellow sodium bisulfate. And cobalt salt generated by the role of dark blue cobalt thiocyanate, and silver salt generated by the role of white thiocyanate, and the role of copper salt generated copper thiocyanate precipitation. The relative density of 1.735g / cm3. Melting point 287 ° C decomposition of sulfides, nitrides and cyanide. Easy to deliquescence in the air, the case of toxic acid gas. Chronic poisoning Thyroid injury occurs, the maximum allowable concentration in the air 50mg / m. With acid and strong oxidant reaction. The product is a high environmental risk products.

Transportation and Storage of Sodium Thiocyanate

Storage: Keep containers tightly sealed Avoid contact with strong acids and strong oxidizing agents. Ventilated and dry place. This product is deliquescence, should be moisture-proof, waterproof. Keep away from fire and heat. Stay away from food.

Transportation: Transport light loading and unloading to prevent damage to packaging and containers. Pay attention to personal protection during packing and handling operations.

Leakage treatment of sodium thiocyanate

With plastic sheeting, canvas cover, reduce the scattering. And then collected, recycled or transported to the disposal of waste disposal sites.

Protective measures of sodium

Engineering control: closed operation, local exhaust. Respiratory protection: may be exposed to dust, you must wear self-absorption filter respirators. Emergency rescue or evacuation, it is recommended to wear an air respirator.

Eye protection: Wear chemical safety glasses.

Physical protection: wear anti-virus clothing clothing.

Hand protection: Wear rubber gloves. Other: work site smoking, eating and drinking. Work completed, shower changing clothes. Separate storage of toxic contaminated clothing, washed back. Maintain good hygiene practices.

Description of the use of sodium thiocyanate

Used for chemical analysis reagents, polyacrylonitrile fiber spinning solvent, color film film rinse agent, some plant defoliants.

Organic synthesis, for the conversion of halogenated hydrocarbons into the corresponding thiocyanate. For example, isopropyl bromide is reacted with sodium thiocyanate in hot ethanol solution to give isopropyl thiocyanate. Similar agents are ammonium thiocyanate and potassium thiocyanate.

Conversion of sodium thiocyanate to acid isothiocyanic acid (S = C = NH). After its in situ formation, it can react with amines to form the corresponding thiourea derivatives.

Used as polyacrylonitrile fiber spinning solvent, chemical analysis reagent, color film film rinse agent, some plant defoliants, and airport road herbicide. Also used in pharmaceutical, printing and dyeing, rubber processing, black nickel plating and the manufacture of artificial mustard oil.

Poisoning of sodium thiocyanate hazards

Is a toxic chemical raw materials, the state prohibits the use of food processing and the use of sodium thiocyanate. Unscrupulous traders to add milk and dairy products in the preservation.

Thiocyanate poisoning: A sub-acute poisoning accident resulting from drinking well water contaminated with thiocyanate was reported. The results show that thiocyanate poisoning is a neuropsychiatric, digestive system and skin lesions mainly systemic diseases, this paper developed a diagnosis and classification of thiocyanate poisoning standards. The poison no special antidote to support symptomatic treatment based.

Principle: sodium nitroprusside containing ferrous ions and red blood cells within the mercapto compounds quickly combined into cyanide, the residence time in the blood is very short, rapid metabolism in the liver into thiocyanate, thiocyanate concentration of plasma is greater than 10mg / L, for the sodium nitroprusside poisoning indicators. Thiocyanate poisoning clinical manifestations: more common in the elderly, renal insufficiency or long-term (more than 3 days) larger doses, in these cases, the clinical should observe the symptoms of thiocyanate poisoning, and monitoring Blood thiocyanate concentration.

Clinical symptoms: neurological depression, metabolic acidosis and cardiovascular system instability should be considered for cyanide or thiocyanate poisoning, should be immediately discontinued, given supportive treatment and antidote. Common detoxification Jing are: sodium nitrite, methylene blue, sodium thiosulfate and hydroxyl cobalt amine. Sodium nitroprusside application> 3d should monitor the concentration of thiocyanate, cyanide blood concentration should also be monitored. Sodium thiosulfate combined with sodium nitroprusside can prevent cyanide toxicity. In patients with renal impairment, fenoldopam may be substituted for sodium nitroprusside.

First-aid measures

Swallowing: drink plenty of water, do not use the mouth of the victims, vomiting, direct access to health care workers.

Skin contact: Remove contaminated clothing, rinse with flowing water. Get medical attention. For a small amount of skin contact, avoid spreading the material spread. Keep the patient warm and be quiet. Inhalation, ingestion or skin contact This substance may cause delayed reaction. To ensure that medical personnel to understand the material related to individual protection knowledge, pay attention to self-protection.

Eye contact: immediately open the upper and lower eyelids, mobile water rinse for 15 minutes. Get medical attention. Eye redness fever, wash with water or saline at least 15 minutes, and contact medical staff. Skin contact immediately after washing with plenty of water or soapy water solution.

Inhalation: Remove from fresh air. Get medical attention. If the patient stops breathing, give artificial respiration. If breathing is difficult, give oxygen. If the patient ingests or inhales the substance, do not use mouth to mouth for artificial respiration, use a one-way valve small respirator or other appropriate medical respirator. Inhalation, immediately to the ventilation, and contact medical staff.

Ingestion: gargle with water gargle, with 1: 5000 potassium permanganate or 5% sodium thiosulfate gastric lavage. Get medical attention.