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Citation: HAN Xiao-Zhao, WANG Da-Yong, HU Xian-Guo, YU Hong. Absorption and Release of Nitrogen Fertilizers in Sodium Polyacrylate[J]. Chinese Journal of Applied Chemistry, ;2007, 24(12): 1383-1387. shu

Absorption and Release of Nitrogen Fertilizers in Sodium Polyacrylate

1.
a School of Chemical Engineering;
2.
b School of Mechanical and Automobile Engineering, Hefei University of Technology, Hefei 230009

Corresponding author: HAN Xiao-Zhao,
Received Date: 24 January 2007
Available Online: 24 May 2007
Fund Project: 安徽省教育厅自然科学重大项目资助(ZD2007009-1) (ZD2007009-1)

This paper reports the absorption-release properties of sodium polyacrylate(PAANa).The results show that urea had no effect on the ratio of absor ption(WAR),while NH₄Cl greatly reduced the WAR,and the higher the NH₄Cl concentration,the smaller the WAR.PAANa has the for urea of different concentrations,the WAR of the PAANa was 370 g/g.When the NH₄Cl concentration was 5,10,15,and 20 g/L,the WAR was 82,62,56,and 55,respectively.The distribution coefficent(_mk^d) of urea was about 1,while _mk^d was 1 in NH₄Cl,and decreased when the NH₄Cl concentration increased.PAANa showed enrichment effect for NH₄⁺ but not for urea.The absorption capacity for urea was about 10 times of that for NH₄⁺.PAANa exhi-bited slow-release property for the absorbed urea and NH₄⁺.When the PAANa was dipped in water 4 times(24 h each),the accumulative release rate of urea and NH₄⁺ was about 80%and 60% respectively.FT-IR spectroscopy indicated that there was an ion-exchange reaction between the NH₄⁺ and the cation in PAANa.
- sodium polyacrylate,
- absorb,
- release,
- urea,
- ammonium chloride
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