|
| Adsorption characteristics of cyantraniliprole in various soils |
| Received:January 20, 2022 |
| View Full Text View/Add Comment Download reader |
| KeyWord:cyantraniliprole;adsorption characteristic;soil;adsorption kinetics;adsorption thermodynamics |
| Author Name | Affiliation | E-mail | | GUO Nan | College of Plant Protection, Jilin Agricultural University, Changchun 130118, China | | | Lü Zhenzhen | College of Plant Protection, Jilin Agricultural University, Changchun 130118, China | | | ZHOU Yuhang | College of Plant Protection, Jilin Agricultural University, Changchun 130118, China | | | CAO Zhanwen | College of Plant Protection, Jilin Agricultural University, Changchun 130118, China | | | LIANG Shuang | College of Plant Protection, Jilin Agricultural University, Changchun 130118, China | | | HOU Zhiguang | College of Plant Protection, Jilin Agricultural University, Changchun 130118, China | | | LU Zhongbin | College of Plant Protection, Jilin Agricultural University, Changchun 130118, China | luzhong1979@aliyun.com |
|
| Hits: 1440 |
| Download times: 1392 |
| Abstract: |
| Adsorption kinetics and adsorption thermodynamics experiments were carried out on five different types of soil to investigate the effects of soil properties and initial solution pH on the adsorption characteristics of cyantraniliprole(CNAP)in soil. The adsorption kinetics of CNAP fit the Elovich equation. The adsorption was rapid within 0~12 h, the equilibrium adsorption time was 48 h, and the equilibrium adsorption capacity at 1 mg · L-1 was 1.21~2.40 mg · kg-1. The adsorption isotherms for CNAP of the different soils fit the Freundlich equation. The Freundlich adsorption constant ranged from 1.11 to 4.97 at 25℃ and was positively and significantly correlated with the organic matter content(P<0.05)and positively related to the clay content. The thermodynamic experiments revealed that the adsorption of CNAP was an endothermic reaction, and the Gibbs free energy change(ΔG)of adsorption was negative. Elevated temperature was favorable for adsorption, and the adsorption enthalpy change was less than 40 kJ·mol-1, which indicated physical adsorption. The initial pH affected the adsorption capacity of CNAP remarkably in aquic soil, cinnamon soil, and red loam soil. The adsorption capacity first increased and then decreased with the increase of pH. The optimum adsorption pH was 4~5. Black soil and paddy soil were not affected by initial pH. There was an obvious positive correlation between the adsorption amount of CNAP in soil and the organic matter content. Computational simulation revealed that CNAP and fulvic acid could form strong hydrogen bonds. The study proves that different soils have different CNAP adsorption characteristics and that higher soil organic matter content, temperature, and clay and silt content are beneficial for adsorption. |
|
|
|
