Study of the Controlled Release of Ametryn Herbicide Using Pva - Activated Carbon Composites

Bortoletto-Santos, Ricardo; Ribeiro, Cauê

doi:10.5935/0100-4042.20140182

Cited by 3 publications

(2 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The release assays were conducted in 250-mL beakers. Immersed in each beaker was a smaller beaker containing 0.500 g of the coated granules under study; the system was kept under constant stirring at room temperature, as described in the methodology of Bortoletto-Santos and Ribeiro, 15 Pereira et al, 16 and Giroto et al 17 The agitation had to be mild to ensure that the urea content measured in the liquid medium was homogeneous and corresponded to the diffusion of the analyzed compound into the medium and its release due to the mechanical action of the stirrer.…”

Section: Scanning Electron Microscopy (Sem)mentioning

confidence: 99%

Controlled release of nitrogen‐source fertilizers by natural‐oil‐based poly(urethane) coatings: The kinetic aspects of urea release

Bortoletto-Santos

Ribeiro

Polito

2016

J of Applied Polymer Sci

Self Cite

View full text Add to dashboard Cite

Urea is the most common source of nitrogen fertilizer, but it has serious disadvantages with respect to volatilization and leaching; these can be controlled by polymeric coatings on the granules. However, the effectiveness of this strategy depends on the formed polymer presenting good adhesion, reactivity with the urea surface, uniformity, and efficient release kinetics control. Therefore, in this study, we evaluated the release kinetics of urea coated by polyurethane produced from two oils (soybean and castor) by analyzing the influence of the thickness, coating stability, deposition interface, and total release time. The results demonstrate that castor oil produced superior materials, which achieved a total release time in water immersion of over 40 days with a total coating mass of less than 4% of the total mass. The good interface suggested that this material may produce coatings of good quality and long release times with minimum thickness, and this will maximize the total nitrogen present in the granule. V C 2016 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016, 133, 43790.

show abstract

Section: Scanning Electron Microscopy (Sem)mentioning

confidence: 99%

Controlled release of nitrogen‐source fertilizers by natural‐oil‐based poly(urethane) coatings: The kinetic aspects of urea release

Bortoletto-Santos

Ribeiro

Polito

2016

J of Applied Polymer Sci

Self Cite

View full text Add to dashboard Cite

show abstract

“…Piperonylic acid (PA) solution (0.1 mM, pH 8.0-Merck, Darmstadt, Germany) was prepared for soil application (SA), using activated carbon, and other foliar application (FA) (Bortoletto-Santos & Ribeiro, 2014). For SA, activated charcoal was homogenised with piperonylic acid solution for 24 h, dried and coated with 1% polyvinyl alcohol solution to controlled release of the compound and applied at a rate of 57.14 kg ha À1 .…”

Section: Field Barley Experimentsmentioning

confidence: 99%

Potential of barley straw pretreated with a lignin inhibitor as an adjunct during beer production

Machado Filho,

Lazzari,

Saraiva

et al. 2024

Int J of Food Sci Tech

View full text Add to dashboard Cite

SummaryBarley straw is an agricultural residue of low added value used for alcohol production through chemical pretreatments. However, chemical pretreatments are expensive and generate residues, preventing the possible application of this product in the food. This study aims to use piperonylic acid as a lignin inhibitor applied in a barley field to obtain a pretreated straw more accessible to structural carbohydrates, releasing fermentable sugars and partially replacing malt in beer. Straws showed structural and chemical changes with SEM, FTIR and compositional analysis. These changes enabled the fermentable sugars release when inserted in wort with 2.5% of barley straw, using cellulase isolated or a xylanase and cellulase mixture in 1:2 proportion, maintaining a final enzyme concentration of 16 U mL−1. Barley straw pretreated with lignin inhibitor can be used as a brewing adjunct, increasing the release of fermentable sugars and bioactive compounds.

show abstract

Role of Polymeric Coating on the Phosphate Availability as a Fertilizer: Insight from Phosphate Release by Castor Polyurethane Coatings

Cruz

Bortoletto-Santos

Guimarães

et al. 2017

J. Agric. Food Chem.

Self Cite

View full text Add to dashboard Cite

The coating of fertilizers with polymers is an acknowledged strategy for controlling the release of nutrients and their availability in soil. However, its effectiveness in the case of soluble phosphate fertilizers is still uncertain, and information is lacking concerning the chemical properties and structures of such coatings. Here, an oil-based hydrophobic polymer system (polyurethane) is proposed for the control of the release of phosphorus from diammonium phosphate (DAP) granules. This material was systematically characterized, with evaluation of the delivery mechanism and the availability of phosphate in an acid soil. The results indicated that thicker coatings can change the maximum nutrient availability toward longer periods, such as 4.5-7.5 wt % DAP coated, that presented the highest concentrations at 336 h, as compared to 168 h for uncoated DAP. In contrast, DAP treated with 9.0 wt % began to increase the concentration after 168 h until it results in maximum release at 672 h. These effects could be attributed to the homogeneity of the polymer and the porosity. The strategy successfully provided long-term availability of a phosphate source.

show abstract

Study of the Controlled Release of Ametryn Herbicide Using Pva - Activated Carbon Composites

Cited by 3 publications

References 0 publications

Controlled release of nitrogen‐source fertilizers by natural‐oil‐based poly(urethane) coatings: The kinetic aspects of urea release

Controlled release of nitrogen‐source fertilizers by natural‐oil‐based poly(urethane) coatings: The kinetic aspects of urea release

Potential of barley straw pretreated with a lignin inhibitor as an adjunct during beer production

Role of Polymeric Coating on the Phosphate Availability as a Fertilizer: Insight from Phosphate Release by Castor Polyurethane Coatings

Contact Info

Product

Resources

About