Journal
JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
Volume 65, Issue 32, Pages 6762-6770Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.jafc.7b01483
Keywords
iron oxyhydroxide colloids; colloidal stability; nanofertilizer; polyphosphate; organic phosphate
Funding
- FWO-Research Foundation Flanders
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Colloidal forms of Fe(III) minerals can be stabilized in solution by coatings of organic or poly-phosphate (P), which reduce the zeta-potential. This opens up a route toward the development of nanoforms of P fertilizers. However, it is unclear if such P forms are bioavailable. To address this question, spinach (Spinacia oleracea) was grown in nutrient solutions, at equal total P, using three different forms of P (orthophosphate = P-i; hexametaphosphate = HMP; myo-inositol hexaphosphate = IHP), free or bound to goethite/ferrihydrite colloids. After 10 days, P uptake was determined with a dose response curve using colloid-free Pi as a reference treatment. The Pi concentration generating equal P uptake as in colloidal P treatments was used to calculate the relative bioavailability of colloidal P (RBA(colloid)). The RBA(colloid) was about 60% for P-i-loaded goethite, stabilized with natural organic matter. For HMP/IHP-P-i-loaded colloids, RBAcolloid ranged between 10 and 50%, in line with their higher sorption strength. In conclusion, colloidal organic P or poly-P can stabilize Fe(III) colloids in solution and can contribute to plant-available P. Soil experiments are required to assess their potential as nanofertilizers.
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