红外光谱分析醋酸酯淀粉包膜尿素膜降解特征

Analysis of the Character of Film Decomposition of Starch Acetate (SA) Coated Urea by Infrared Spectrum

采用傅里叶变换红外吸收光谱(FTIR)方法分析醋酸酯淀粉包膜尿素及与生化抑制剂结合的四种肥料在棕壤中膜降解特征,为包膜尿素肥料的应用提供科学依据。分析表明,膜化学成分,分子结构和膜组成没有因加入不同的抑制剂而改变。膜特征峰主要是H-O,—OH,CO2,C=O,—CH2,—CH3,C—O,C—O—H,C—O—C的不对称、对称伸缩振动吸收。在棕壤中,最高峰吸收强度总趋势0>15>30>60>90>120>150>310d,前15d降解相对缓慢。150d大部分膜物质已降解。经过310d,膜主要官能团或分子结构发生了实质性改变,不同抑制剂对膜降解速度没有显著影响。红外吸收光谱完全可以测定与描述醋酸酯淀粉膜降解特征,并可揭示膜降解速度差异。

The degradability characteristics of film with 4 kinds of starch acetate coated and inhibitors amended urea were analyzed by FTIR,which was purposed to supply theoretical basis for applying starch acetate coated urea fertilizers in farming.The result showed that the chemical component,molecule structure and material form of the membrane were not changed because of adding different inhibitors to urea.The main peaks of the film degradation process were brought by the H—O,—OH,CO2,CO,—CH2,—CH3,C—O,C—O—H and C—O—C vibrancy in asymmetry and symmetry.In brown soil,the trend of absorbing value of the most high peak was 015306090120150310 d.The infrared spectra of 4 kinds of fertilizers were not different remarkably,and the film was comparatively slowly degraded before 15 d.But a majority of the film had been already degraded after 150 days.The main components of film materials were degraded fastest in 310 days.The speed of film degradation wasn＇t more impacted by different inhibitors.The characteristic of starch acetate film degradation may be monitored entirely and degradation speed difference of the film could be represented through infrared spectrum.