本文選題：黃土性土壤　切入點(diǎn)：鐵氧化物　出處：《干旱地區(qū)農(nóng)業(yè)研究》2017年01期

【摘要】：針對土壤含氧化鐵的普遍性以及氧化鐵對土壤理化性質(zhì)的重要影響,探求氧化鐵對土壤吸附重金屬離子的作用與影響。采用了化學(xué)選擇性溶提技術(shù),分別去除黃土性母質(zhì)上發(fā)育的古土壤、淋溶褐土和黃褐土中不同形態(tài)的氧化鐵,采用了等溫吸附試驗(yàn),并以Langmuir和Freundlich方程擬合參數(shù)為指標(biāo),分析去除不同形態(tài)氧化鐵前后土壤對Pb~(2+)的吸附特征。結(jié)果表明:原土壤對Pb~(2+)的吸附曲線逐漸遞增,并無明顯階段特征,且更符合Freundlich方程;而去除不同形態(tài)氧化鐵后的3類土壤對Pb~(2+)的吸附曲線均為L型,階段特征顯著,更加符合Langmuir方程,且土壤對Pb~(2+)的親和力(KL)成倍增加;去除絡(luò)合態(tài)鐵和無定形氧化鐵后,土壤對Pb~(2+)的最大吸附量均有不同程度增加,其中去除無定形氧化鐵之后,古土壤對Pb~(2+)的最大吸附量增幅最大,增加了14.71 mg·g-1;去除游離態(tài)氧化鐵后古土壤、淋溶褐土對Pb~(2+)的吸附量分別下降了5.95、3.10 mg·g-1,黃褐土對Pb~(2+)的吸附量則增加了2.98 mg·g-1。土壤中氧化鐵對Pb~(2+)吸附能力與吸附容量的影響不完全依賴于氧化鐵的含量,在很大程度上依賴于土壤中氧化鐵的形態(tài)。對于不同氧化鐵形態(tài)的土壤采用相應(yīng)的化學(xué)溶提技術(shù),能夠獲得具有較高吸附性能的粘土礦物環(huán)境材料。
[Abstract]:In view of the universality of ferric oxide in soil and the important influence of iron oxide on the physical and chemical properties of soil, the effect of iron oxide on the adsorption of heavy metal ions on soil was explored.Chemical selective extraction technique was used to remove iron oxide from loess parent material, leaching cinnamon soil and yellow cinnamon soil respectively. The isothermal adsorption test was used, and the fitting parameters of Langmuir and Freundlich equations were taken as indexes.The adsorption characteristics of Pb~(2 on soil before and after removal of different forms of iron oxide were analyzed.The results showed that the adsorption curve of Pb~(2 increased gradually, and had no obvious phase characteristics, and was more in line with the Freundlich equation, but the adsorption curves of Pb~(2 for the three kinds of soils with different forms of iron oxide were all L-type, and the phase characteristics were significant.鍙ゅ湡澹ゅPb~(2 )鐨勬渶澶у惛闄勯噺澧炲箙鏈，

本文編號：1706799