Diammonium phosphate

Diammonium Phosphate

Diammonium phosphate crystals

Diammonium phosphate (DAP) is a water-soluble ammonium phosphate salt that is commonly used as a fertilizer. It is one of a series of water-soluble ammonium phosphate salts that can be produced when ammonia reacts with phosphoric acid.

Chemical Composition

Diammonium phosphate has the chemical formula (NH_)_HPO_. It consists of two ammonium ions (NH__) and one hydrogen phosphate ion (HPO___). The compound is highly soluble in water, which makes it an effective source of both nitrogen and phosphorus for plants.

Production

The production of diammonium phosphate involves the reaction of ammonia with phosphoric acid. The process can be represented by the following chemical equation:

\[ 2 \text{NH}_3 + \text{H}_3\text{PO}_4 \rightarrow (\text{NH}_4)_2\text{HPO}_4 \]

This reaction results in the formation of diammonium phosphate, which can then be crystallized and dried for use as a fertilizer.

Uses

Fertilizer

Diammonium phosphate is primarily used as a fertilizer. It provides a concentrated source of phosphorus and nitrogen, which are essential nutrients for plant growth. DAP is particularly valued for its ability to supply phosphorus in a form that is readily available to plants.

Fire Retardant

In addition to its use as a fertilizer, diammonium phosphate is also used as a fire retardant. It is applied to forest fires and wildfires to help control the spread of flames. The compound works by lowering the combustion temperature of the material it is applied to, thereby slowing the spread of fire.

Environmental Impact

The use of diammonium phosphate as a fertilizer can have environmental impacts. Excessive application can lead to nutrient runoff, which can contribute to eutrophication of water bodies. This process can result in algal blooms and depletion of oxygen in the water, affecting aquatic life.

Safety

Diammonium phosphate is generally considered safe to handle, but it should be used with caution. It can cause irritation to the skin and eyes upon contact. Proper protective equipment, such as gloves and goggles, should be worn when handling the compound.

Related Pages

• Ammonium phosphate
• Phosphoric acid
• Fertilizer
• Eutrophication