共查询到20条相似文献,搜索用时 109 毫秒
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以氰戊菊酯、三唑酮和莠去津分别作为杀虫剂、杀菌剂、除草剂的代表,对三类农药的色谱定量分析进行了探讨。选择3%SE-30色谱柱,以邻苯二甲酸二壬酯为氰戊菊酯的内标,以邻苯二甲酸二丙酯为三唑酮的内标,以三唑酮为莠去津的内标,在不同温度下完成上述农药有效成分的定量分析。结果表明,氰戊菊酯的标准偏差为0.11,变异系数为0.57%,回收率为99.62%;三唑酮的标准偏差为0.15,变异系数为0.73%,回收率为99.35%;莠去津的标准偏差为0.12,变异系数为0.31%,回收率为99.8%。 相似文献
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研究了磷酸三丁酯(TBP)-正辛醇萃取煤气化废水中的酚。实验考察了TBP浓度、温度对萃取过程中分配系数的影响规律,确定了萃取产物的结构组成及反应焓变,通过液液萃取模型理论建立了TBP萃取酚的分配系数模型,且以煤气化废水为实验水样验证了分配系数模型的准确性。结果表明:TBP浓度越大,萃取分配系数越大,当TBP体积分数由10%增至50%时,萃取分配系数由17.6增至61.4;温度升高,萃取分配系数降低,温度由30℃升至70℃时,萃取分配系数由42.9降至34.7;TBP浓度对萃取分配系数模型有影响,且平均相对误差控制在1.14%;温度对萃取分配系数模型有影响,且平均相对误差控制在0.87%。通过模型预估及实际实验值的对比,该萃取分配系数模型在预测煤气化废水萃取分配系数上具有较高的可信度。 相似文献
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利用X射线计算机断层扫描(X-CT)联合Cs离子增强技术连续监测水分在非饱和水泥基材料中的动态传输过程,建立水分传输距离与时间的关系,获得水分传输的毛细吸水系数,在此基础上提出了计算水泥基材料渗透系数的理论模型。系统研究了水灰比、粉煤灰掺量、矿渣掺量和砂体积掺量对水泥基材料毛细吸水系数和渗透系数的影响,结果表明:当水灰比从0.35增大到0.55时,硬化水泥浆体的毛细吸水系数从2.07×10-4 m/s1/2增大到3.22×10-4 m/s1/2,而固有渗透系数增大1个数量级;粉煤灰的掺入能有效降低浆体的水分传输性能,且粉煤灰的最佳掺量为30%(质量分数),当矿渣掺量为30%(质量分数)时,硬化浆体的固有渗透系数比掺同等质量粉煤灰的高1个数量级;当砂体积掺量从0%增加到40%时,砂浆的毛细吸水系数和固有渗透系数均下降,当砂体积掺量大于42.4%时,砂浆的界面过渡区(ITZ)连通,砂浆的毛细吸水系数增大。 相似文献
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An aqueous two-phase system (ATPS) consisting of acetone and phosphate was used to extract acetoin from fermentation broth. The influence of phase composition on partition of acetoin was investigated. When the filtered fermentation broth was used, relatively high partition coefficient (22.3) and recovery coefficient (96.4%) of acetoin were obtained by a system composed of 30% (w/w) acetone and 35% (w/w) dipotassium hydrogen phosphate. Then the system was applied to extract unfiltered fermentation broth directly, and the recovery coefficient of acetoin was 94.3%. Simultaneously, the byproduct 2,3-butanediol could also be extracted with the recovery coefficient of 93.5%. In addition, the removal of residual sucrose, cells, proteins, and prodigiosin from the fermentation broth was studied, and the removal ratios of these impurities were all above 85%. Ultimately, the recovery of phosphate in the bottom phase was explored, and the recovery coefficient could reach 93.7% through pH adjustment and dilution crystallization. The recovered phosphate also showed good ATPS extraction ability. This method provides a new possible way for the separation of acetoin from fermentation broth. 相似文献
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5%锐劲特悬浮剂的高效液相色谱分析 总被引:6,自引:1,他引:6
采用高效液相色谱法 ,使用反向色谱柱和紫外检测器 ,用外标法对 5 %锐劲特悬浮剂进行定性、定量分析。方法的标准偏差为 0 0 3,变异系数 0 6% ,线形相关系数 0 9998,回收率 98 7%~ 10 0 .4 % 相似文献
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