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Phosphorus plays a key role in cellularmechanisms and ecosystems. It is typically found inrocks and mineral deposits although it is a limitedresource. Through erosion, phosphate ions aregradually released and their solubility in water presentsproblems for aquatic ecosystems. One of the problemsthat high phosphate concentrations in aquaticecosystems cause is eutrophication. Typical phosphateconcentrations in unpolluted freshwater systems canrange from 0.01 mg/L to 0.025 mg/L, howeverCorpoboyacá has found phosphate levels rangingbetween 0.801 and 11.0 mg/L. A combination ofmagnetic nanoparticles and polysaccharides (chitosan)are linked together to form chitosan modifiednanoparticles (CMNPs) with the ability to performmultiple adsorption/desorption cycles with greatefficiency.