Journal of Food, Agriculture and Environment
Vol 10,
Issue 3&4,2012
Online ISSN: 1459-0263
Print ISSN: 1459-0255
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The effect of calcium and sodium chloride levels on the dehydration power of hydrophilic polymer
Author(s):
Mahdi Ramezani 1 *,
Mohammad Jafari 2, Ali Tavili 2, Seyed Akbar Javadi 1, Qhavamodin Zahedi Amiri 2Recieved Date: 2012-05-28, Accepted Date: 2012-10-06
Abstract:Hydrogels or humidity superabsorbents are the polymers which have water retention ability and can keep the water and some liquid fertilizers in long time and in culture soil help plant favorable growth and reduce water loss and irrigation costs. One of the important issues of these polymers is the effect of different salts on the change of their dehydration power during time. The expected change of dehydration due to the type and concentration of salts was considered in the study of the polymer dehydration level in the presence of salts in soil. The change of dehydration in drying and wetting times caused by NaCl and CaCl2 solutions of 290, 1700 and 2000 mg/L was studied. Then 1.0 g polyacrylamide polymer (commercial brand A200) was added in the solutions and the samples were kept for 24 hours in order that the polymer reached the dehydration maximum. The dehydration was 183.65 g/g polymer saturated in distilled water in the first dehydration time. The dehydration of this polymer saturated in NaCl and CaCl2 solutions of 290, 1700 and 2000 mg, respectively, was 47, 68 and 70% and 74, 91 and 91% lesser than that of polymer saturated in distilled water. After 3 times drying and rehydration, the dehydration ability of polymer saturated in NaCl and CaCl2 solutions of 290, 1700 and 2000 mg, respectively, was 51, 69 and 71% and 80, 92 and 92% lesser than in the fourth times dehydration of polymer saturated in distilled water. The destructive effect of monovalent sodium cation on the polymer dehydration is lesser than that of divalent calcium cation.
Keywords:Hydrogel,
superabsorbent polymers, polymer A200, CaCl2 and NaCl, concentration, dehydrationJournal: Journal of Food, Agriculture and Environment
Year: 2012
Volume: 10
Issue: 3&4
Category: Environment
Pages: 1448-1450
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