Abstract

Selenium is one of the necessary nutrients for the growth and development of animals and humans. Improving the activation of selenium in soil is an important way to increase the selenium content in agricultural products. However, nanomaterials have not been applied in the study of soil activation properties. This paper studies the application of nanomaterials in soil selenium activation, clarifies the correlation of selenium transformation in soil under different nanomaterial applications, and explores the adsorption-desorption rules of selenium in soil by adsorption-desorption experiments. The adsorption of Se (IV) by the five nanomaterial culture soils reached equilibrium within 26 h, and the complexation was best at 3 h. With the extension of the application time, the percentages of soil soluble and exchangeable selenium in Nanomaterials 3 and Nanomaterials 4 treatments are increasing, and the increase rates are 1.35%–3.25%, 1.23–4.59%, and 3.96%–5.24%, 3.15%–4.98%. As a whole, the order of the equilibrium adsorption amount is Nanomaterials 3> Nanomaterials 2> Nanomaterials 1> Nanomaterials 4> Nanomaterials 5, and their adsorption amounts are 23.47 mg / kg, 21.69 mg / kg, 20.08 mg / kg, 19.83 mg / kg and 18.10 mg / kg. At 60 d, the soil selenium activation rate reached the highest; after 60 d, the soil activation rate became stable. In the whole process, the activation rate of soil selenium by Nanomaterials 3 and Nanomaterials 4 treatments is significantly higher than that of Nanomaterials 2 and Nanomaterials 1 treatments. It can be seen that these two treatments have the best effect on activating soil selenium.

摘要

硒是动物和人类生长发育所必需的营养素之一。提高土壤中硒的活化是提高农产品硒含量的重要途径。然而，纳米材料尚未应用于土壤活化特性的研究。本文研究了纳米材料在土壤硒活化中的应用，阐明了不同纳米材料应用下土壤中硒转化的相关性，并通过吸附-解吸实验探索了土壤中硒的吸附-解吸规律。5种纳米材料培养土对Se(IV)的吸附在26 h内达到平衡，3 h时络合效果最佳。随着申请时间的延长，纳米材料 3 和纳米材料 4 处理土壤可溶性和可交换硒的百分比增加，增加率分别为 1.35%~3.25%、1.23~4.59%、3.96%~5.24%、3.15%~4.98%。总体而言，平衡吸附量的顺序为纳米材料3>纳米材料2>纳米材料1>纳米材料4>纳米材料5，其吸附量分别为23.47mg/kg、21.69mg/kg、20.08mg/kg、19.83mg/公斤和 18.10 毫克/公斤。60 d时土壤硒活化率最高；60 d后，土壤活化率趋于稳定。在整个过程中，纳米材料3和纳米材料4处理对土壤硒的活化率显着高于纳米材料2和纳米材料1处理。