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Ammonium thiocyanate powder is an inorganic substance with the chemical formula NH4SCN and CAS 1762-95-4. It is a colorless crystalline powder. Irritable, easily deliquescent, soluble in water, undergoes endothermic reaction when dissolved in water, soluble in ethanol, alkali metal hydroxides, acetone, pyridine, and liquid sulfur dioxide, almost insoluble in chloroform (chloroform). The solution turns red under sunlight. Its aqueous solution appears blood red in iron salt solution and does not react in the presence of ferrous salts. The dried product melts without decomposition when heated to 159 ℃, and undergoes a molecular change to thiourea when heated to 170 ℃. Used as a blackening agent in black nickel plating solutions in analytical chemistry and for the determination of iron and silver ions in electrolytes.
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Chemical Formula |
CH4N2S |
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Exact Mass |
76 |
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Molecular Weight |
76 |
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m/z |
76 (100.0%), 78 (4.5%), 77 (1.1%) |
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Elemental Analysis |
C, 15.78; H, 5.30; N, 36.80; S, 42.12 |
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Ammonium thiocyanate powder (chemical formula NH ₄ SCN) is a colorless crystal with a wide range of chemical applications. The following is a detailed introduction to all uses of ammonium thiocyanate:
Metal surface treatment
Ammonium thiocynate can be used as a metal surface treatment agent to remove oxide layers and other impurities, thereby improving the quality and adhesion of metal surfaces. This treatment can enhance the glossiness of the metal surface, improve its corrosion resistance, and provide a better substrate for subsequent coatings or plating.
catalyzer
Ammonium thiocynate acts as a catalyst in organic and biochemical reactions, promoting reaction rates. It can accelerate the process of chemical reactions and improve reaction efficiency. Especially in polymerization reactions, ammonium thiocynate as a polymerization catalyst can significantly improve the yield and quality of polymers.
Manufacturing other chemicals
Ammonium thiocynate is a raw material used in the production of chemicals such as cyanide and thiourea. Through specific chemical reactions, ammonium thiocynate can be converted into these useful compounds, providing important intermediates and raw materials for the chemical industry.
Pharmaceutical manufacturing applications
Pharmaceutical raw materials or intermediates
Ammonium thiocynate plays an important role in pharmaceutical manufacturing. It can be used as a raw material or intermediate for certain drugs and participate in the synthesis process of drugs. These drugs may be used to treat various diseases and contribute to human health.
Synthesis and isolation of antibiotics
Ammonium thiocynate also plays an important role in the production process of antibiotics. It can be used not only for the synthesis of antibiotics, but also for the isolation and purification of antibiotics. Through the specific action of ammonium thiocyanate, the production and purity of antibiotics can be increased, providing high-quality products for the pharmaceutical industry.
Industrial use of pesticides
Herbicides and defoliants
Ammonium thiocyante is used in the pesticide industry to manufacture herbicides and defoliants. These pesticides can effectively control weeds and fallen leaves, improving crop yield and quality. The specific chemical properties of ammonium thiocynate make it irreplaceable in the manufacturing process of these pesticides.
Pesticide analysis
Ammonium thiocyanate can also be used for the analysis and detection of pesticides. Through specific chemical reactions, the nitrogen content in pesticides can be determined, providing accurate basis for the quality control of pesticides.
Herbicides and defoliants
Ammonium thiocyante is used in the pesticide industry to manufacture herbicides and defoliants. These pesticides can effectively control weeds and fallen leaves, improving crop yield and quality. The specific chemical properties of ammonium thiocynate make it irreplaceable in the manufacturing process of these pesticides.
Pesticide analysis
Ammonium thiocyanate can also be used for the analysis and detection of pesticides. Through specific chemical reactions, the nitrogen content in pesticides can be determined, providing accurate basis for the quality control of pesticides.
Dye manufacturing
Ammonium thiocyanate powder has a wide range of applications in the dye industry. It can be used to manufacture various dyes, which can be used for dyeing and printing textiles. The specific chemical properties of ammonium thiocyante enable it to react with dye molecules to form stable dye compounds.
Organic synthesis catalyst
In the process of organic synthesis, ammonium thiocyante can accelerate the reaction as a catalyst. It can reduce the activation energy of the reaction, increase the reaction rate, and thus increase the yield and quality of organic compounds.
Application of Electroplating and Electroplating Additives
Composition of electroplating solution
Ammonium thiocyante is one of the components of electroplating solutions in the electroplating industry. It can improve the electrochemical performance of the plating solution, enhance the adhesion and glossiness of the plating layer. By the action of ammonium thiocyanate, a more uniform and dense electroplating layer can be obtained, which improves the quality of electroplated products.
Galvanizing additive
During the galvanizing process, ammonium thiocynate as an additive can significantly improve the quality of the galvanized layer. It can inhibit the hydrolysis and oxidation of zinc ions, reduce the generation of zinc slag, and thus improve the uniformity and adhesion of the galvanized layer.
Printing and dyeing diffusion agent
Printing and dyeing, as well as the use of printing and dyeing diffusion agents
Ammonium thiocynate is used as a diffusion agent in the printing and dyeing industry. It can improve the diffusion performance of dyes, allowing them to penetrate better into the fibers, thereby enhancing the dyeing effect. By the action of ammonium thiocyanate, a more vivid and uniform dyeing effect can be obtained.
Auxiliary raw materials for hydrogen peroxide production
Ammonium thiocynate is one of the auxiliary raw materials for producing hydrogen peroxide. Through specific chemical reactions, ammonium thiocynate can be converted into hydrogen peroxide, providing an important oxidant for the chemical industry.
Electroplating additives
In addition to being used for galvanizing, ammonium thiocynate can also be used as an additive in other electroplating processes. It can improve the stability of the plating solution, enhance the quality of the plating layer, and provide a more efficient and environmentally friendly solution for the plating industry.
Other uses
Water quality analysis
Ammonium thiocynate can also be used for water quality analysis. By reacting with specific metal ions, the metal ion content in water can be determined, providing important data support for water quality monitoring and environmental protection.
Analysis of nitrogen content in pesticides
In the quality control process of pesticides, ammonium thiocynate can be used to analyze the nitrogen content of pesticides. Through specific chemical reactions and measurement methods, the nitrogen content in pesticides can be accurately determined, providing important basis for quality control and formula adjustment of pesticides.
Antibiotic isolation
Ammonium thiocynate can also be used in the separation process of antibiotics. Through specific chemical reactions and separation techniques, antibiotics can be extracted and purified from fermentation broth, providing high-quality antibiotic products for the pharmaceutical industry.
Verification and determination of trace iron
Ammonium thiocynate can be used for the determination of trace iron. By reacting with iron ions to form specific colored compounds, quantitative analysis of iron can be performed using methods such as spectrophotometry. This method has wide applications in fields such as environmental monitoring and food safety.
Blackening agent in electroplating additives
During the electroplating process, ammonium thiocynate can also be used as a blackening agent. It can react with other components in the plating solution to form a black plating layer, providing a unique appearance for the plated product.
Manufacturing pesticides such as Yeqingshuang
Ammonium thiocynate can also be used to manufacture pesticide products such as Yeqingshuang. These pesticide products have specific biological activities and mechanisms of action, which can be used to control pests and diseases on crops, and improve crop yield and quality.
adverse reaction
Ammonium thiocyanate, as an inorganic compound, is widely used in industry, chemical experiments, and specific medical scenarios. However, its powder form may cause multiple toxic reactions through direct contact, inhalation, or ingestion due to its high skin permeability, volatility, and chemical activity.
Skin and mucosal irritation response
Ammonium thiocyanate powder has strong irritant properties and can cause contact dermatitis upon direct contact with the skin, manifested as erythema, itching, and peeling. Long term exposure may lead to skin keratinization or chronic ulcers. For example, workers in a gold purification plant have experienced hand ulcers due to long-term manual operation of ammonium thiocyanate, indicating a risk of chronic skin damage. The mechanism may be related to the disruption of skin barrier function by thiocyanate ions, inducing the release of inflammatory factors. In addition, the powder is prone to adhere to the conjunctiva, causing chemical conjunctivitis, manifested as conjunctival congestion, tearing, and photophobia. It is necessary to immediately rinse with water for more than 15 minutes to reduce damage.
Respiratory toxicity
After inhaling ammonium thiocyanate dust or aerosols, it can irritate the upper respiratory mucosa, causing symptoms such as cough, sore throat, and chest tightness. High concentration exposure may lead to chemical pneumonia, manifested as respiratory distress and pulmonary edema, requiring emergency medical intervention. Occupational exposure studies have shown that workers who inhale ammonium thiocyanate dust for a long time have significantly reduced FEV1 (forced expiratory volume in one second) in lung function tests, indicating an increased risk of chronic obstructive pulmonary disease (COPD). Its toxicity mechanism involves oxidative stress response, dust activates alveolar macrophages to release reactive oxygen species (ROS), and damages alveolar epithelial cells and capillary endothelium.
Digestive system damage
Ingestion of ammonium thiocyanate powder can cause acute gastrointestinal reactions, including nausea, vomiting, abdominal pain, diarrhea, and in severe cases, gastrointestinal bleeding. According to data from the World Health Organization (WHO), consuming 3 grams by mistake can cause vomiting and difficulty breathing, while consuming more than 10 grams can be fatal. Its corrosiveness originates from the decomposition of thiocyanate ions into hydrogen sulfide (H ₂ S) and cyanide (CN ⁻) in gastric acid environment, which directly damages the gastrointestinal mucosa. Chronic exposure may lead to gastric mucosal atrophy, intestinal metaplasia, and increased risk of gastric cancer.
Hematological suppression
Ammonium thiocyanate has an inhibitory effect on bone marrow hematopoietic function, and long-term exposure increases the risk of thrombocytopenia by 2-3 times. In severe cases, it can lead to pancytopenia. The mechanism involves the competitive inhibition of key enzymes involved in folate metabolism (such as dihydrofolate reductase) by thiocyanate ions, which interferes with DNA synthesis and leads to impaired production of red blood cells, white blood cells, and platelets. Clinical manifestations include anemia, tendency towards infection (such as fever and sore throat), and tendency towards bleeding (such as skin bruising and nosebleeds). In the blood routine test of occupational exposure population, the proportion of white blood cell count below 4 × 10 ⁹/L is significantly higher than that of non exposure group.
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