נגישות
menu      
חיפוש מתקדם
תחביר
חפש...
הספר "אוצר וולקני"
אודות
תנאי שימוש
ניהול
קהילה:
אסיף מאגר המחקר החקלאי
פותח על ידי קלירמאש פתרונות בע"מ -
Effect of soil moisture on the release of alachlor from alginate-based controlled-release formulations
Year:
2008
Authors :
גרסטל, זאב
;
.
מינגלגרין, אורי
;
.
נאסר, אחמד
;
.
Volume :
56
Co-Authors:
Nasser, A., Institute of Soils, Water and Environmental Sciences, ARO, Volcani Center, P.O. Box 6, Bet Dagan 50-250, Israel
Mingelgrin, U., Institute of Soils, Water and Environmental Sciences, ARO, Volcani Center, P.O. Box 6, Bet Dagan 50-250, Israel
Gerstl, Z., Institute of Soils, Water and Environmental Sciences, ARO, Volcani Center, P.O. Box 6, Bet Dagan 50-250, Israel
Facilitators :
From page:
1322
To page:
1327
(
Total pages:
6
)
Abstract:
The release of alachlor from controlled-release formulations (CRFs) based on alginate-montmorillonite matrices into aqueous polyethylene glycol (PEG) solutions of different concentrations and into a soil at different moisture contents was studied. In distilled water and in PEG-containing solutions displaying -0.1 MPa potential and up, the beads imbibe water and swell. The ensuing increase in weight is about 5%, and the increase in the bead's diameter is about 10%. At water potentials of -0.5 MPa and lower, loss of weight and shrinkage of the beads were observed. The changes in weight and diameter of the alginate-clay beads incubated in a Hamra loamy sand soil at 26.5% moisture content (w/w; -0.18 MPa) were similar to those observed in PEG solutions of >-0.5 MPa moisture potential. The weight and diameter losses observed in the drier soils (12.0 and 7.1% water content; -0.49 and -1.11 MPa) were similar to those in the more concentrated PEG solutions. A decrease in the rate of release of the active ingredient from the beads into soil was observed as the water potential decreased (drier soils). The release of the active ingredient from the investigated CRFs displayed a linear relationship to the square root of time, suggesting a diffusion-controlled-release rate. Data extracted from this relationship enabled the formulation of a mathematical model that correlates rate of release to water content. © 2008 American Chemical Society.
Note:
Related Files :
acetamide derivative
alginic acid
chemistry
Controlled release
Delayed-Action Preparations
herbicides
soil
water
עוד תגיות
תוכן קשור
More details
DOI :
10.1021/jf0718392
Article number:
Affiliations:
Database:
סקופוס
Publication Type:
מאמר
;
.
Language:
אנגלית
Editors' remarks:
ID:
23209
Last updated date:
02/03/2022 17:27
Creation date:
16/04/2018 23:57
Scientific Publication
Effect of soil moisture on the release of alachlor from alginate-based controlled-release formulations
56
Nasser, A., Institute of Soils, Water and Environmental Sciences, ARO, Volcani Center, P.O. Box 6, Bet Dagan 50-250, Israel
Mingelgrin, U., Institute of Soils, Water and Environmental Sciences, ARO, Volcani Center, P.O. Box 6, Bet Dagan 50-250, Israel
Gerstl, Z., Institute of Soils, Water and Environmental Sciences, ARO, Volcani Center, P.O. Box 6, Bet Dagan 50-250, Israel
Effect of soil moisture on the release of alachlor from alginate-based controlled-release formulations
The release of alachlor from controlled-release formulations (CRFs) based on alginate-montmorillonite matrices into aqueous polyethylene glycol (PEG) solutions of different concentrations and into a soil at different moisture contents was studied. In distilled water and in PEG-containing solutions displaying -0.1 MPa potential and up, the beads imbibe water and swell. The ensuing increase in weight is about 5%, and the increase in the bead's diameter is about 10%. At water potentials of -0.5 MPa and lower, loss of weight and shrinkage of the beads were observed. The changes in weight and diameter of the alginate-clay beads incubated in a Hamra loamy sand soil at 26.5% moisture content (w/w; -0.18 MPa) were similar to those observed in PEG solutions of >-0.5 MPa moisture potential. The weight and diameter losses observed in the drier soils (12.0 and 7.1% water content; -0.49 and -1.11 MPa) were similar to those in the more concentrated PEG solutions. A decrease in the rate of release of the active ingredient from the beads into soil was observed as the water potential decreased (drier soils). The release of the active ingredient from the investigated CRFs displayed a linear relationship to the square root of time, suggesting a diffusion-controlled-release rate. Data extracted from this relationship enabled the formulation of a mathematical model that correlates rate of release to water content. © 2008 American Chemical Society.
Scientific Publication
You may also be interested in