Nitric acid

Nitric acid is a highly corrosive and oxidizing inorganic acid with the chemical formula HNO3. This colorless to slightly yellow liquid is one of the most important industrial chemicals, characterized by its strong acidic properties and powerful oxidizing capabilities. With a molecular weight of 63.013 g/mol and CAS number 7697-37-2, nitric acid is classified as a dangerous substance requiring careful handling due to its corrosive nature and acute toxicity.

Nitric acid is a colorless to pale yellow liquid at room temperature with a characteristic pungent, suffocating odor. It is highly miscible with water in all proportions and has a high density. The substance is hygroscopic, meaning it readily absorbs moisture from air. Nitric acid is thermally unstable and decomposes when heated, releasing toxic nitrogen oxides. It exhibits strong oxidizing properties and reacts violently with organic materials and reducing agents.

Nitric acid serves multiple industrial applications, primarily in fertilizer production where it's used to manufacture ammonium nitrate and other nitrogen-based fertilizers. It's essential in explosives manufacturing, metal processing for pickling and etching, and in the production of nitrocellulose for plastics and lacquers. The chemical industry uses it for synthesizing various organic and inorganic compounds, while the electronics sector employs it for semiconductor processing and PCB manufacturing.

Nitric acid requires strict safety protocols due to its corrosive and oxidizing nature. Personnel must wear appropriate PPE including acid-resistant gloves, chemical-resistant clothing, safety goggles, and respiratory protection when necessary. Work should be conducted in well-ventilated areas or under fume hoods. Avoid contact with organic materials, metals, and reducing agents. Use acid-resistant tools and equipment, and ensure emergency shower and eyewash stations are readily accessible.

Nitric acid must be stored in cool, dry, well-ventilated areas away from direct sunlight and heat sources. Use only containers made of compatible materials such as glass or specific acid-resistant plastics. Keep separated from organic materials, metals, alkalis, and reducing agents to prevent dangerous reactions. Storage areas should have appropriate spill containment systems and be equipped with emergency response materials. Maintain temperatures below 25°C when possible.

Immediate action is crucial following nitric acid contact. For skin contact, remove contaminated clothing and flush affected area with copious amounts of water for at least 15-20 minutes. If eyes are affected, rinse immediately with clean water for at least 15 minutes while holding eyelids open. For inhalation, move victim to fresh air immediately. If ingested, do not induce vomiting; rinse mouth and seek immediate medical attention for all exposure scenarios.

Nitric acid disposal must comply with local environmental regulations and waste management laws. Small quantities can be neutralized carefully with appropriate alkaline materials under controlled conditions, but this should only be done by trained personnel. Large quantities require professional hazardous waste disposal services. Never pour nitric acid down drains or into the environment. Contact licensed waste disposal companies familiar with corrosive and oxidizing substances for proper treatment and disposal.

Nitric acid is classified under ADR as Class 8 (corrosive substances), Packing Group I, indicating high danger level. Transportation requires specialized packaging meeting UN specifications and appropriate hazard labeling including corrosive and oxidizing pictograms. Vehicles must carry proper documentation, emergency response information, and drivers need hazmat certification. Shipments must comply with quantity limitations and routing restrictions as specified in dangerous goods transportation regulations.

Nitric acid is extensively regulated under multiple European frameworks including REACH registration requirements and CLP classification as Oxidizing Liquid 3, Acute Toxicity 3, and Skin Corrosion 1A. It requires appropriate GHS pictograms (GHS03, GHS06, GHS05) and 'Danger' signal word on labels. Industrial users must comply with occupational exposure limits, environmental discharge restrictions, and may need permits for storage and use. The substance is not currently listed as SVHC under REACH.

Nitric acid is available through OYSI, a specialized European distributor of industrial chemicals. As professional chemical suppliers, OYSI provides nitric acid in various concentrations and packaging sizes suitable for industrial applications. They ensure compliance with European regulations including proper documentation, safety data sheets, and transportation requirements. For pricing, availability, and technical specifications, contact OYSI directly to discuss your specific nitric acid requirements and delivery options across Europe.