N-(n-Butyl)thiophosphoric triamide

N-butylthiophosphoryltriamide

N-(n-Butyl)thiophosphoric triamide N-(n-Butyl)thiophosphoric triamide, commonly known as NBPT, is a chemical compound used as a urease inhibitor in agriculture. It is a white crystalline solid that is soluble in organic solvents. NBPT is primarily used to enhance the efficiency of nitrogen fertilizers by reducing nitrogen loss through volatilization.

Properties

NBPT has a molecular formula of C5H14N2PS and a molar mass of 180.22 g/mol. It has a melting point of approximately 70-72°C and a boiling point of around 220-230°C. The compound is stable under normal conditions but should be stored in a cool, dry place away from heat and direct sunlight.

Applications

NBPT is commonly added to urea-based fertilizers to inhibit the enzyme urease, which catalyzes the hydrolysis of urea to ammonia and carbon dioxide. By inhibiting urease activity, NBPT helps to slow down the conversion of urea to ammonia, thereby reducing nitrogen loss through volatilization. This results in improved nitrogen use efficiency and higher crop yields.

Environmental Impact

The use of NBPT in agriculture has been shown to reduce nitrogen losses to the environment, particularly in the form of ammonia emissions. By minimizing nitrogen volatilization, NBPT helps to increase the availability of nitrogen for plant uptake, thereby reducing the need for excessive fertilizer application. This can lead to improved environmental sustainability and reduced nitrogen pollution in water bodies.

Safety Precautions

When handling NBPT, it is important to wear appropriate personal protective equipment, such as gloves and goggles, to prevent skin contact and eye irritation. In case of accidental exposure, rinse the affected area with plenty of water and seek medical attention if necessary. NBPT should be stored in a secure location away from children and pets to prevent accidental ingestion.

See Also

• Urease inhibitor
• Nitrogen fertilizers
• Agricultural chemicals