为控制含有违禁药物依托咪酯的电子烟在非法市场的蔓延,研究建立气相色谱-质谱法对电子烟中依托咪酯进行检验.文章对依托咪酯测定条件进行了研究,结果显示该方法对依托咪酯的检出限为0.1 mg/L,定量限为1.0 mg/L,回收率为95.6％～97.9％,相对标准偏差为2.7％～4.6％.研究结果表明用构建的方法可以对电子烟中的依托咪酯进行分析,方法检验依托咪酯快速准确、简单方便.

采用样品中衍生结合中空纤维液相微萃取技术,与高效液相色谱-荧光检测器进行联用,对水中的腐胺、尸胺、酪胺、亚精胺和精胺等五种常见的生物胺进行检测.讨论了中空纤维液相微萃取过程中,萃取时间、萃取温度、搅拌速度等条件对萃取效率的影响.结果 表明,五种生物胺的峰形和分离效果都比较好,加标实际水样的回收率和精密度也令人满意.对标准工作曲线的相关性分析结果显示,五种生物胺在0.10-100 mg/L这一线性范围内具有良好的线性,可用于实际水样中生物胺的测定.

本文以常存在于水中的五种生物胺(腐胺PUT.、尸胺CAD.、组胺HIS.、亚精胺SPD.、精胺SPM.)作为分析对象,优化了液相色谱的测定条件(流动相、发射波长、梯度洗脱程序等)、生物胺的衍生条件以及分散液液微萃取的萃取条件,建立了分散液液微萃取-液相色谱-荧光检测技术应用于检测水中五种生物胺残留的方法.

本文提出一种利用离子色谱法辅以其他仪器分析方法鉴定爆炸现场残留物中分解产物的方法来鉴定过氧化甲乙酮的方法.由于过氧化甲乙酮性质极不稳定,易分解成二氧化碳、甲酸、乙酸、丙酸、丁酮等产物,本文利用离子色谱法鉴定水溶液中甲酸、乙酸、丙酸,应用气相色谱及气相色谱质谱联用技术鉴定顶空气体中二氧化碳及丁酮,从而实现对爆炸现场提取物中主要成分进行定性分析,方法准确可靠.

采用均匀设计确定的最佳工艺条件提取鸡腿菇中的多糖,醇沉干燥得到粗多糖,再经过柱层析分离纯化后得2个组分,分别命名为DTA和DTB。采用醋酸纤维素薄膜纸电泳检测DTA的纯度,实验显示为单一多糖,利用高效液相色谱分析DTA组成,结果表明,糖基组成为木糖、阿拉伯糖、葡萄糖、半乳糖、甘露糖。

A new sensor based on the porous plastic probe has been developed for the detection of dissolved oxygen. This probe was prepared by co-polymerization of monomer, cross-linking reagent, porogent and luminescent ruthenium(II)diimine complex. The porous plastic probe exhibits good response to dissolved oxygen and resistance to indicator leaching out due to its high hydrophobicity. The preparation and characteristics of the probe were investigated in detail. This porous plastic probe serves as analyte-sensitive function as well as optical wave-guide, which make it easy to assemble the fiber-optical chemical sensor (FOCS). The developed sensor has been applied to the determination of dissolved oxygen in seawater with satisfactory results compared with the standard method.

A method is reported for the determination of melamine in feedstuff.Final analysis is accomplished using Symmetry C18 stainless column and liquid chromatography-ultraviolet detection at a wavelength of 236nm.the method is accurate,rapid and convenient.the results indicate that the recovery is more than 90%,RSD is less than 3.0% and the working curves of melamine was in the linear range 1mg/L-100mg/L.