| 郭南,吕珍珍,周雨杭,曹战文,梁爽,侯志广,逯忠斌.溴氰虫酰胺在土壤中的吸附特性[J].农业环境科学学报,2022,41(8):1750-1757. |
| 溴氰虫酰胺在土壤中的吸附特性 |
| Adsorption characteristics of cyantraniliprole in various soils |
| 投稿时间：2022-01-20 |
| DOI：10.11654/jaes.2022-0081 |
| 中文关键词: 溴氰虫酰胺 吸附特性 土壤 吸附动力学 吸附热力学 |
| 英文关键词: cyantraniliprole adsorption characteristic soil adsorption kinetics adsorption thermodynamics |
| 基金项目:农业部行业标准制定嘧菌环胺在人参中的残留限量标准（14202008） |
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| 中文摘要: |
| 为研究溴氰虫酰胺（CNAP）在土壤中的吸附特性，在5种不同类型的土壤上进行吸附动力学和吸附热力学试验，探究了土壤性质和溶液初始pH对吸附行为的影响。结果表明，CNAP的吸附动力学符合Elovich方程，0~12 h快速吸附，平衡吸附时间为48 h，1 mg·L-1时的平衡吸附量为1.21~2.40 mg·kg-1。不同土壤对CNAP的吸附等温线符合Freundlich方程，25℃下Freundlich吸附常数范围为1.11~4.97，与有机质含量呈显著正相关（P<0.05），与黏粉粒含量正相关。通过热力学试验发现，CNAP的吸附是吸热反应，吸附Gibbs自由能变为负值，升高温度有利于吸附发生，吸附焓变小于40 kJ·mol-1，属于物理吸附。初始pH显著影响潮土、褐土、红壤土对CNAP的吸附量，吸附量随着pH的升高先增大后降低，最适吸附pH为4~5，黑土和水稻土不受初始pH的影响。CNAP在土壤中的吸附量与有机质含量呈显著正相关，计算模拟表明CNAP和黄腐酸能形成较强的氢键。研究表明不同土壤对CNAP有不同的吸附特性，提高土壤有机质含量、升高温度、增加黏粉粒含量有利于吸附。 |
| 英文摘要: |
| 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. |
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