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| NH4+ adsorption characteristics of different saline soils |
| Received:April 20, 2020 |
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| KeyWord:NH4+;saline soils;adsorption;pH;Na+;Ca2+;Al3+ |
| Author Name | Affiliation | E-mail | | XU Yi-fan | College of Resources and Environment Science, Jilin Agricultural University, Changchun 130118, China | | | SUN Fang-yuan | College of Resources and Environment Science, Jilin Agricultural University, Changchun 130118, China | | | GUO Ya-xin | College of Resources and Environment Science, Jilin Agricultural University, Changchun 130118, China | | | MA Xiu-lan | College of Resources and Environment Science, Jilin Agricultural University, Changchun 130118, China | 1974malan@163.com | | WANG Yu-jun | College of Resources and Environment Science, Jilin Agricultural University, Changchun 130118, China | jlndwangyujun@163.com |
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| Abstract: |
| The equilibrium adsorption method was used to investigate the effects of mild, moderate, and severe saline-alkaline soils on nitrogen adsorption and influencing factors to explore the changing law of NH4+ adsorption characteristics in different salinized soils. The results showed that the adsorption capacity of NH4+ in soils with three different degrees of salinization increased with the depth of salinization. The equilibrium adsorption capacity was:severe salinized soil > moderately saline soil > lightly saline soil. The adsorption process conformed to the Langmuir adsorption model; the Pseudo-second-order kinetic model better describes the adsorption process of ammonium nitrogen on soils with different degrees of salinization, and the adsorption equilibrium time was 720 min. The adsorption reaction of three types of test soils on ammonium nitrogen were processes of spontaneous, exothermic, and chaotic increase; In the pH range (3.0~9.0)of the background liquid, the adsorption of ammonium nitrogen by the three types of test soils increased as pH increased. The adsorption of ammonium nitrogen in soil with different degrees of salinization decreased with increasing ion concentration with the addition of different concentrations of Na+, Ca2+, and Al3+ solutions. Increasing the pH of the solution could enhance the ammonium nitrogen adsorption capacity of saline-alkali soil, and the increase in temperature and ion valence was not conducive to adsorption, because the degree of soil salinization was increased, and the adsorption capacity for ammonium nitrogen was enhanced. This limited the migration of ammonium nitrogen reducing the risk of pollution. |
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