In this work, two novel approaches were developed for miniaturized liquid-liquid(L-L) extraction on microfluidic chips, based on a stopped-flow extraction technique. In the first approach, trapped droplets extraction ...In this work, two novel approaches were developed for miniaturized liquid-liquid(L-L) extraction on microfluidic chips, based on a stopped-flow extraction technique. In the first approach, trapped droplets extraction mode, organic solvent droplets of a few hundred 10 -12 L were trapped within micro recesses fabricated in the channel walls of microfluidic chips, and analytes in aqueous streams flowing over the droplets were transferred into them, affecting a preconcentration. In the second approach, a stable interface between stationary organic phase and continuously flowed aqueous phase was formed by stopping the flow of organic phase. Analytes were transferred from the aqueous phase into the organic phase on the interface. Enrichment factors exceeding 1 000 and 300 were achieved with a preconcentration period of 20 min with sample consumption lower than 10 μL for trapped droplets and stopped-flow microextraction. In situ laser induced fluorescence detection of the concentrated analyte was performed following the preconcentration.展开更多
The 50 kt/a benzene extraction unit based on the liquid-liquid extraction technology at Karamay Petrochemical Company designed by PetroChina East China Design Institute has been successfully put on stream at the first...The 50 kt/a benzene extraction unit based on the liquid-liquid extraction technology at Karamay Petrochemical Company designed by PetroChina East China Design Institute has been successfully put on stream at the first attempt. The benzene quality has reached the design target with the purity exceeding 99.99%. The benzene content in the raffinate is less than 0.4 % and the solvent content is less than 5 ppm. Currently this technology has passed the assessment on the achievements organized by PetroChina and is to be disseminated in full scale within the PetroChina system.展开更多
文摘建立了基于分散液液微萃取技术(DLLME)的高效液相色谱法同时测定食用植物油中6种真菌毒素的方法。样品经石油醚脱脂,乙腈-水-乙酸(体积比84∶15∶1)超声提取,CHCl3为萃取剂液液萃取净化及柱前衍生化后,以Agilent XDB-C18色谱柱(4.6 mm×150 mm, 3.5μm)分离,梯度洗脱,经荧光检测器检测。结果表明:食用植物油中6种真菌毒素的线性关系良好,相关系数均大于0.999,方法检出限为0.2~0.5μg/kg,样品的平均加标回收率为75.88%~105.25%,相对标准偏差为0.5%~9.5%。该方法可用于食用植物油中黄曲霉毒素(AFB1、AFB2、AFG1、AFG2)以及赭曲霉毒素(OTA、OTB)6种真菌毒素的同时检测。
文摘In this work, two novel approaches were developed for miniaturized liquid-liquid(L-L) extraction on microfluidic chips, based on a stopped-flow extraction technique. In the first approach, trapped droplets extraction mode, organic solvent droplets of a few hundred 10 -12 L were trapped within micro recesses fabricated in the channel walls of microfluidic chips, and analytes in aqueous streams flowing over the droplets were transferred into them, affecting a preconcentration. In the second approach, a stable interface between stationary organic phase and continuously flowed aqueous phase was formed by stopping the flow of organic phase. Analytes were transferred from the aqueous phase into the organic phase on the interface. Enrichment factors exceeding 1 000 and 300 were achieved with a preconcentration period of 20 min with sample consumption lower than 10 μL for trapped droplets and stopped-flow microextraction. In situ laser induced fluorescence detection of the concentrated analyte was performed following the preconcentration.
文摘The 50 kt/a benzene extraction unit based on the liquid-liquid extraction technology at Karamay Petrochemical Company designed by PetroChina East China Design Institute has been successfully put on stream at the first attempt. The benzene quality has reached the design target with the purity exceeding 99.99%. The benzene content in the raffinate is less than 0.4 % and the solvent content is less than 5 ppm. Currently this technology has passed the assessment on the achievements organized by PetroChina and is to be disseminated in full scale within the PetroChina system.
