紫外分光光度法测定控释尿素的透膜扩散速率  

Rate of Controlled-Release Urea Pervasion through Membrane Determined by Ultraviolet Spectrophotometry

作　　者：左秀锦[1] 王祯鑫[2] 戴小敏[2] 周毅[2] 马小军[1] 

机构地区：[1]中国科学院大连化学物理研究所,辽宁大连116013 [2]大连大学环境与化工学院,辽宁大连116622

出　　处：《光谱学与光谱分析》2006年第6期1151-1154,共4页Spectroscopy and Spectral Analysis

基　　金：国家"863"项目(2001AA246021);中国科学院知识创新重大项目(KZCX1-SW-19)资助

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=426m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％。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 p-dimethylaminozenzal-dehyde as color reagent, and the absorbance exhibits a linear reponses to the urea concentration over the range of 7. 5-210μg· 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 98. 1%-103. 9%.

关 键 词：紫外-分光光度法 控释尿素 对二甲氨基苯甲醛 检测 

分 类 号：O657.3[理学—分析化学]