【摘要】 使用控释氮肥能提高其利用率,减轻环境污染。(包膜型)控释尿素是近几年发展较快的控释氮肥之一。控释尿素透膜扩散速率是其控释性能的一个重要指标。研究表明,使用对二甲氨基苯甲醛为显色剂,在酸性水溶液介质中显色络合物的最大紫外吸收峰在λ=426 nm处,尿素浓度在7.5~210μg.mL-1范围内,其浓度与吸光度呈线性关系。据此,建立了在此紫外波段测定水溶液中尿素的含量来实现控释尿素透膜扩散速率的测定方法,其回收率为96.1%~103.9%。更多还原

【Abstract】 Application of controlled-release nitrogenous fertilizers can improve the efficiency of fertilizers and reduce the environmental pollution.Controlled-release urea（coated urea） is one of the controlled-release nitrogenous fertilizers developed quickly in the recent years.The rate of controlled-release urea pervasion through membrane is the most important index of the capacity of controlled release.There is a maximum absorption at λ=426 nm with complex in acidic solution,using pdimethylaminozenzaldehyde as color reagent,and the absorbance exhibits a linear reponses to the urea concentration over the range of 7.5210 μg·mL^-1.The method for determining the rate of controlled-release urea pervasion through membrane was realized through determining the content of urea in the liquor,the recovery efficiency of the method is 96.1%-103.9%.更多还原