Nitric oxide

Nitric oxide is a colorless, paramagnetic gas with the chemical formula NO and molecular weight of 30.006 g/mol. This simple diatomic molecule consists of one nitrogen atom bonded to one oxygen atom. It is a free radical due to its unpaired electron, making it highly reactive. Nitric oxide occurs naturally in the atmosphere and plays important biological roles in living organisms, including vasodilation and neurotransmission functions.

Nitric oxide is a colorless gas at room temperature with a characteristic sharp, sweet odor. It has a boiling point of -151.8°C and melting point of -163.6°C. The gas is slightly soluble in water and more soluble in organic solvents. It readily reacts with oxygen to form nitrogen dioxide (NO2), giving a brown color. As a paramagnetic molecule with an unpaired electron, it exhibits magnetic properties and high chemical reactivity.

Nitric oxide serves multiple industrial and research applications. It is primarily used in the semiconductor industry for chemical vapor deposition and plasma etching processes. In medical applications, it functions as a vasodilator for treating pulmonary hypertension and respiratory conditions. Research laboratories utilize NO for studying its biological functions and atmospheric chemistry. It also serves as an intermediate in nitric acid production and various chemical synthesis processes.

Nitric oxide requires careful handling due to its reactive nature and potential health hazards. Always work in well-ventilated areas or under fume hoods to prevent inhalation. Use appropriate respiratory protection, safety goggles, and protective clothing. Handle cylinders with care and secure them properly. Monitor for leaks regularly as NO readily oxidizes to toxic NO2. Ensure proper grounding to prevent static discharge and avoid contact with incompatible materials like organic compounds and strong oxidizers.

Nitric oxide must be stored in compatible gas cylinders in cool, dry, well-ventilated areas away from heat sources and direct sunlight. Keep cylinders upright and properly secured to prevent tipping. Store separately from incompatible materials including flammable substances, organic materials, and strong oxidizers. Maintain storage temperatures below 50°C and ensure adequate ventilation to prevent accumulation of leaked gas. Regular inspection of storage equipment and leak detection systems is essential for safe storage.

Nitric oxide exposure requires immediate response measures. For inhalation exposure, move the affected person to fresh air immediately and seek medical attention if breathing difficulties occur. In case of skin or eye contact, flush thoroughly with water for at least 15 minutes. Remove contaminated clothing and seek medical evaluation. For large releases, evacuate the area and ventilate thoroughly. Contact emergency services if serious exposure occurs or if symptoms like difficulty breathing or chest pain develop.

Nitric oxide disposal must comply with local environmental regulations and waste management guidelines. Small quantities can be safely vented in well-ventilated areas or neutralized through controlled reaction with appropriate scrubbing solutions. Larger quantities require professional hazardous waste disposal services. Empty cylinders should be returned to the supplier for proper handling. Never release significant amounts directly into the atmosphere and always consult local authorities for specific disposal requirements in your region.

Nitric oxide is classified as ADR Class 2 dangerous goods for transportation purposes. It must be shipped in approved pressure vessels designed for compressed gases, properly labeled and documented according to international dangerous goods regulations. Transportation requires appropriate placarding, shipping papers, and emergency response information. Only trained personnel should handle the transport process. Vehicles must be properly ventilated and equipped with appropriate safety equipment for gas transport operations.

Nitric oxide is regulated under various chemical safety frameworks including REACH registration requirements in Europe. It falls under CLP classification for hazard communication and labeling. The substance is not currently listed as a Substance of Very High Concern (SVHC). Industrial users must comply with workplace exposure limits, environmental emission standards, and proper safety data sheet requirements. Specific regulations may vary by country and application, particularly for medical or research use.

Nitric oxide is available through OYSI, a specialized European distributor of technical chemicals and gases. As an established chemical supplier, OYSI can provide nitric oxide in various purities and packaging options suitable for different industrial and research applications. Contact OYSI directly to discuss your specific requirements, technical specifications, and delivery options across Europe. They can also provide technical support and safety documentation to ensure proper handling and compliance with local regulations.