Controlled release of nitrate from hydrotalcite modified formulations
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URI: http://hdl.handle.net/10835/15799
DOI: http://dx.doi.org/10.1016/j.clay.2011.03.018
DOI: http://dx.doi.org/10.1016/j.clay.2011.03.018
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2011Resumen
Different nitrate controlled release systems based on modified hydrotalcite-like LDH (LDH) have been
investigated to reduce environmental pollution derived from nitrogen-fertilizer use. A synthesized nitrate–
hydrotalcite was modified with hydroxypropyl methylcellulose (HPMC) in different proportions and two
types of systems were prepared: a) granules with a LDH/HPMC 5/1 proportion and three different sizes
(200 μm, 500 μm and 1 mm) and b) tablets with three different proportions of LDH/HPMC (5/1, 5/0.5 and 5/
0.25). In order to determine the release rate of the active ingredient, we carried out the release experiments as
a function of time in water and in a simulated soil solution. In both experimental conditions (decarbonated
water and simulated soil solution), the LDH/HPMC 5/0.5 system produces the slowest release rate of nitrate
than the other two systems. Using the Ritger and Peppas equation, the T50 parameter was calculated. The
average values ranged from 8.7×10−4 h and ...
Palabra/s clave
Nitrate
Hydrotalcite
Controlled release
LDH