柱切换离子色谱法研究二元表面活性剂–草甘膦微乳剂热贮稳定性

以十二烷基苯磺酸钠(SDBS)和脂肪醇聚氧乙烯醚(AEO)进行表面活性剂的复配,应用柱切换离子色谱法,通过测定草甘膦含量评价其热贮稳定性。草甘膦的质量浓度在0.02~5 mg/L范围内与色谱峰面积呈良好的线性,相关系数r=0.999 6,检出限为0.009 mg/L(S/N=3),保留时间和峰面积重复性分别为0.72%,1.63%(n=6),回收率为97.96%~102.23%。配制的阴/非离子二元表面活性剂复合体系–草甘膦微乳剂在(54±2)℃条件下贮藏14 d后,分解率小于5%,为合格,配方热贮稳定性良好。该方法简单、准确,灵敏度高,可用于二元表面活性剂–草甘膦微乳剂的热稳定性研究。

Thermal Storage Stability in Binary Ionic-Nonionic Surfactants-Glyphosate Microemulsion Using Ion Chromatography Coupled with Column-Switching Technique

Sodium dodecyl benzene sulfonate(SDBS) and fatty alcohol-polyoxyethylene ethe(AEO) were used for making a mixture of surfactants. Thermal storage stability was studied in binary ionic/nonionic surfactants-glyphosate microemulsion by ion chromatography coupled with column-switching, through detection of glyphosate. The results exhibited good linearity in the range of 0.02-5 mg/L. The limit of detection was 0.009 mg/L. The repeatability of retention time and peak area was 0.72%,1.63%,respectively. The standard addition recoveries between 97.96% and 102.23%. The dissociation of the binary ionic/nonionic surfactants-glyphosate microemulsion was below 5% after being stored for 14 days at (54±2)℃. This method is simple,reliable and sensitive, it can be used for researchment of thermal stability of binary surfactants-glyphosate microemulsion.