Scientia Agricultura Sinica ›› 2013, Vol. 46 ›› Issue (8): 1595-1602.doi: 10.3864/j.issn.0578-1752.2013.08.008

• TILLAGE & CULTIVATION·PHYSIOLOGY & BIOCHEMISTRY·AGRICULTURE INFORMATION TECHNOLOGY • Previous Articles     Next Articles

Characteristics of Adsorption and Desorption of Aluminum in Pectin as Influenced by Boron

 LI  Mei, YU  Min   

  1. College of Life Science, Foshan University, Foshan 528231, Guangdong
  • Received:2012-09-25 Online:2013-04-15 Published:2012-12-12

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Abstract: 【Objective】The influence of boron on adsorption and desorption of aluminum in pectin were studied in order to probe the possible mechanism of boron in alleviating aluminum toxicity. 【Method】Isothermal adsorption method was conducted to study the influence of different concentrations of boron on the adsorption/desorption of aluminum in pectin under the conditions of pH 3.5 and 25℃.【Result】The total amount of aluminum adsorpted/desorpted in pectin significantly increased with the increase of pectin in equilibrium solution, but it significantly decreased in unit pectin. The amount of aluminum adsorpted/desorpted increased significantly with the increase of aluminum concentration as well. Boron pretreatment affected the characteristics of aluminum adsorption/desorption in pectin. Low concentration of boron less than 25 µmol•L-1 inhibited the adsorption/desorption of aluminum in pectin while the opposite was found at concentration higher than 25 µmol•L-1. When boron concentration was 100 µmol•L-1, the amount of aluminum adsorption in pectin was even more than that of the control without boron. But aluminum adsorption in pectin reduced when boron concentration was 200 µmol•L-1, suggesting that pectin aluminum adsorption reached saturation. The curves of aluminum adsorption could be well described by both Langmuir and Freundlich isotherm adsorption equations with determination correlation coefficient R2 over 0.97. The maximum adsorption capacity calculated by Langmuir decreased from 5.757 mg•g-1 to 0.160 mg•g-1 after adding boron, and the parameters of derived by Freundlich equation were 1.4702 and -0.1758, respectively, which indicated that the cross-linking of pectin RG-Ⅱ with boron affected strongly on aluminum adsorption in pectin. 【Conclusion】Boron could effectively inhibit aluminum adsorption in pectin at low concentration, while promote aluminum adsorption in pectin at high concentration.

Key words: pectin , boron , aluminum , adsorption , desorption

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