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Struvite (magnesium ammonium phosphate) is a phosphate mineral with formula: NH 4 MgPO 4 ·6H 2 O. Struvite crystallizes in the orthorhombic system as white to yellowish or brownish-white pyramidal crystals or in platy mica-like forms. It is a soft mineral with Mohs hardness of 1.5 to 2 and has a low specific gravity of 1.7. It is sparingly ...
The crystallization of struvite (made up of magnesium, ammonium, and phosphate) during the wastewater treatment process can also be used as a fertilizer. The addition of magnesium to wastewater that already contains ammonium and phosphate allows for a 1:1:1 mole ratio in which all three elements bind to one another, allowing struvite to form as ...
The most common form of organic phosphate is phytate, the principal storage form of phosphorus in many plant tissues. While there is on average 1000 lb per acre (1120 kg per hectare) of phosphorus in the soil, it is generally in the form of orthophosphate with low solubility, except when linked to ammonium or calcium, hence the use of ...
Calcium absorption is increased by water-soluble phosphate fertilizers, and is used when potassium and potash fertilizers decrease the uptake of phosphorus, magnesium and calcium. For these reasons, imbalanced application of potassium fertilizers can markedly decrease crop yields.
For example, mono-ammonium phosphate fertilizer may have a cadmium content of as low as 0.14 mg/kg or as high as 50.9 mg/kg. [89] The phosphate rock used in their manufacture can contain as much as 188 mg/kg cadmium [ 90 ] (examples are deposits on Nauru [ 91 ] and the Christmas Islands [ 92 ] ).
Both triammonium salts evolve ammonia. In contrast to the unstable nature of the triammonium salts, the diammonium phosphate (NH 4) 2 HPO 4 and monoammonium salt (NH 4)H 2 PO 4 are stable materials that are commonly used as fertilizers to provide plants with fixed nitrogen and phosphorus. [3] Ammonium phosphate is the main ingredient in pink ...
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