Scientia Agricultura Sinica ›› 2012, Vol. 45 ›› Issue (23): 4836-4843.doi: 10.3864/j.issn.0578-1752.2012.23.010

• SOIL & FERTILIZER·WATER-SAVING IRRIGATION·AGROECOLOGY & ENVIRONMENT • Previous Articles     Next Articles

Effects of Fe and Al Oxides on Adsorption of Bt Toxin by Several Soils in South of China

 FU  Qing-Ling, DENG  Ya-Li, HU  Hong-Qing, WEI  Xia, HAN  Xiao-Fang, LI  Yan   

  1. 1.College of Resource and Environment, Huazhong Agricultural University, Wuhan 430070;
    2. Tianjin Institute of Agricultural Resource and Environmental Sciences, Tianjin 300192
  • Received:2012-04-18 Online:2012-12-01 Published:2012-06-19

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Abstract: 【Objective】This paper studied the interaction between Bt toxin and several soils in South of China (Latosols, Latosolic red soil, red soil, yellow soil and paddy soil), and explored the effects of Fe and Al oxides on the adsorption. 【Method】 The adsorption characteristics of Bt toxin by different soils were measured by isothermal adsorption method and fitted by Langmuir equation. 【Result】 The results indicated that except the isotherm curve of Bt toxin adsorbed by Latosols and red soil after removal of free Fe and Al oxides were H type, the adsorption isotherms of Bt toxin by other tested soils were all L-shaped and fitted to Langmuir equation. The adsorption amount of Bt toxin by soils after removal organic bound Fe and Al oxides increased compared to their original soils, while the adsorption amount by soils after removal other species of Fe and Al oxides decreased, and the greatest impact was observed after the removal of free Fe and Al oxides. The adsorption affinity (KL) of Bt toxin adsorbed by soils after removal of organic bound Fe and Al oxides was the highest, and the lowest was shown on soils after removal of free Fe and Al oxides.【Conclusion】 Except organic Fe and Al oxides, Fe and Al oxides (such as the free, amorphous Fe and Al oxides, etc.) promoted the adsorption of Bt toxin by soils, which could provide a reference for the assessment of the environmental risk of Bt protein in soil.

Key words: Bt toxin , adsorption , soil , Fe and Al oxides

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