Zhang Zhongqing, Gao Qiang, Yang Jingmin, Li Yue, Liu Jinhua, Wang Yujun, Su Hongge, Wang Yin, Wang Shaojie, Feng Guozhong
Key Laboratory of Soil Resource Sustainable Utilization for Jilin Province Commodity Grain Bases, College of Resources and Environmental Science, Jilin Agricultural University, Changchun 130118, People's Republic of China.
Ecological Environment Bureau of the Changchun Jingyue Economic Development Zone, Changchun 130118, People's Republic of China.
R Soc Open Sci. 2020 Sep 9;7(9):200259. doi: 10.1098/rsos.200259. eCollection 2020 Sep.
The nitrapyrin was easily adsorbed by soil, but most current studies have focused on comparing the effects of nitrapyrin application at different soil organic matter levels and in different soil types. The adsorption kinetics and isotherm adsorption of the nitrification inhibitor nitrapyrin in black soil, chernozem and planosol were studied in this paper. The adsorption kinetics were fitted by quasi-second-order kinetic equation ( 0.8907, < 0.05) with a lower acting energy of adsorption ( < 8.0 kJ mol). The isotherm was fitted by the Langmuir equation ( 0.9400, < 0.05). The adsorption mechanism was determined to involve a spontaneous endothermic reaction accompanied mainly by physical adsorption to the surface that belonged to the '' isotherm curve ( > 1). Temperature promoted the adsorption of nitrapyrin in these three soils, and the maximum adsorption occurring at different temperatures following the order of black soil > planosol > chernozem. The adsorption capacity and rate decreased with decreasing soil organic matter. For the black soil, the nitrapyrin EC adsorption rate was more than seven times higher than that of nitrapyrin CS. The result would determine the dose of nitrapyrin required for availability in different types of soils and to provide a theoretical basis for elucidating the adsorption of nitrapyrin in the soil environment.
硝吡啉很容易被土壤吸附，但目前大多数研究集中在比较不同土壤有机质水平和不同土壤类型下施用硝吡啉的效果。本文研究了硝化抑制剂硝吡啉在黑土、黑钙土和潜育土中的吸附动力学及等温吸附。吸附动力学采用准二级动力学方程拟合（R² = 0.8907，P < 0.05），吸附活化能较低（Ea < 8.0 kJ·mol）。等温线采用Langmuir方程拟合（R² = 0.9400，P < 0.05）。确定吸附机制涉及自发吸热反应，主要伴随物理吸附到属于“L”等温线曲线（n > 1）的表面。温度促进了硝吡啉在这三种土壤中的吸附，不同温度下最大吸附量顺序为黑土>潜育土>黑钙土。吸附容量和速率随土壤有机质含量降低而降低。对于黑土，硝吡啉乳油的吸附速率比硝吡啉可湿性粉剂高7倍以上。该结果将确定不同类型土壤中硝吡啉有效利用所需的剂量，并为阐明硝吡啉在土壤环境中的吸附提供理论依据。
