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DC Field | Value | Language |
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dc.contributor.advisor | Farid, Muhamad | |
dc.contributor.advisor | Khotib, Mohammad | |
dc.contributor.author | Ayatillah, Fahmiy | |
dc.date.accessioned | 2014-07-04T01:15:16Z | |
dc.date.available | 2014-07-04T01:15:16Z | |
dc.date.issued | 2014 | |
dc.identifier.uri | http://repository.ipb.ac.id/handle/123456789/69549 | |
dc.description.abstract | Onggok is a byproduct of tapioca production from cassava. Onggok contains 73% of starch which is potential to be transformed into soil conditioner, i.e. hydrogel to control urea release rate. Onggok was copolymerized by grafting with Na-acrylate, ammonium persulfate as initiator, and N,N-methylene-bis-acrylamide as cross-linker to produce onggok-g-polyacrylate hydrogel. Swelling of the hydrogel in water and 1 M urea solution were 250 and 203 g/g, respectively. The amount of urea that could be loaded into the hydrogel 1 M urea solution was 99%. Urea release rate from hydrogel in water followed a sigmoidal pattern, i.e. Richards model with correlation coefficient of 0.997. This hydrogel could inhibit the urea release in water 8.2 times higher compared with conventional urea application. Biodegradation of 0.11 g of hydrogel in 250 g of soil produced 754 mg of CO2 in 29 days so that it can be used in soil for more than 1 month. | en |
dc.language.iso | id | |
dc.title | Laju Pelepasan Urea dari Onggok-g-poliakrilat dan Biodegradasinya | en |
dc.subject.keyword | urea release rate | en |
dc.subject.keyword | soil conditioner | en |
dc.subject.keyword | onggok-g-polyacrylate | en |
dc.subject.keyword | hydrogel | en |
dc.subject.keyword | biodegradation | en |
Appears in Collections: | UT - Chemistry |
Files in This Item:
File | Description | Size | Format | |
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G14fay.pdf Restricted Access | full text | 13.89 MB | Adobe PDF | View/Open |
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