Monammonium phosphate (MAP) and diammonium phosphate (DAP) are called ammoniated phosphates because phosphoric acid is treated with ammonia to form these basic phosphate products that also contain nitrogen. They are widely produced in the granular form for blending with other types of fertilizers and are also produced in nongranular forms for use in liquid fertilizers. MAP and DAP can be toxic to the lungs in high concentrations. There are several emission standards for hazardous air pollutants from phosphoric acid and phosphate fertilizer production (18,19).
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