Enhancement of nitrogen release properties of urea–kaolinite fertilizer with chitosan binder
| Autor: | Suraya Abdul Rashid, Bita Roshanravan, Shahram Mahmoud Soltani, Fariba Mahdavi, Mohd Khanif Yusop |
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| Rok vydání: | 2015 |
| Předmět: |
Chemical Health and Safety
Health Toxicology and Mutagenesis Inorganic chemistry chemistry.chemical_element Environmental pollution Ammonia volatilization from urea Toxicology Controlled release Nitrogen Chitosan Ammonia chemistry.chemical_compound chemistry Urea Fourier transform infrared spectroscopy |
| Zdroj: | Chemical Speciation & Bioavailability. 27:44-51 |
| ISSN: | 2047-6523 0954-2299 |
| DOI: | 10.1080/09542299.2015.1023090 |
| Popis: | The use of controlled release fertilizer (CRF) has become a new trend to minimize environmental pollution. In this study, urea–kaolinite containing 20 wt% urea after one hour dry grinding was mixed with different concentrations of chitosan as a binder to prepare nitrogen-based CRF. Fourier transform infrared spectroscopy confirmed the hydrogen bonding between urea and kaolinite. Covalent interaction between urea–kaolinite and chitosan make the granules stronger. The nitrogen release was measured in 5 days interval using a diacetylmonoxime calorimetric method at a wavelength of 527 nm. The results illustrated that by increasing the chitosan concentration from 3 to 7.5%, nitrogen release decreased from 41.23 to 25.25% after one day and from 77.31 to 59.27% after 30 days incubation in water. Compressive stress at break tests confirmed that granules with chitosan 6% had the highest resistance and were chosen for ammonia volatilization tests. Ammonia volatilization was carried out using the forced-draft techni... |
| Databáze: | OpenAIRE |
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