毛细管气相色谱法测定中药中有机氯农药残留量

建立了江西省两种中药中有机氯农药残留量的气相色谱分析方法。样品以丙酮提取,在NaCl存在下,以正已烷进行液—液分配,提取液用H2SO4净化,采用DB—1701毛细管柱,GC—ECD检测有机氯农药残留量。最低检测限为1.0×10-3-5.0×10-3mg/kg,添加回收率为85.7%-115.2%,应用于实际样品中有机氯农药残留量的检测,获得了较为满意结果。     

用毛细管测量纯水表面张力系数的误差讨论

通过用毛细管测量纯水表面张力系数实验，得到管内径d与接触角θ的相对误差之间的关系曲线，由此说明实验测得的表面张力系数α和理论公式相比呈现一定的偏差，并简单地讨论了实验的理想状态与实际情况的差别．     

毛细管电色谱中进样时间对柱效的影响

毛细管电色谱是近年发展起来的一种新型微分离技术，它结合了高效液相色谱和毛细管电泳的物点，具有高效、快速，高选择性，其有关理论研究和应用越来越深入，本文从色谱动力学角度讨论了毛细管电色谱中进样时间对柱的影响。     

以高度磺化的β－环糊精为手性选择剂的利伐斯狄明对映体毛细管电泳分离

利用高度磺化的β－环糊精为毛细管电泳手性选择剂，成功地分离了碱性药物利伐斯狄明，并且测定了其非消旋体样品的光学纯度。一般情况下碱性药物的分离是在酸性条件下进行的（pH＝2.5），目的是为了减小分析物在毛细管内壁的吸附。然而，对于利伐斯狄明，在pH 2.5时检测灵敏度较低，且不足以检测样品中低于1％的光学杂质；但实验发现提高缓冲液的pH值可以提高其检测灵敏度；而且，由于分析物在毛细管壁吸附造成的柱效降低可以通过线性聚丙烯酰胺动态涂层来抑制。本实验考察了环糊精的浓度，缓冲液的pH值和离子强度对分离度的影响，同时通过测定重现性，线性范围，最低检测限和最低检测量对方法进行了验证。最后在最佳条件下测定了非对映异构体样品的光学纯度。     

Experimental Study of Capillary Effect in Porous Silicon Using Micro-Raman Spectroscopy and X-Ray Diffraction

We investigate the capillary effect and the residual stress evolution in the wetting, drying and rewetting stages of porous silicon using x-ray diffraction and micro-Raman spectroscopy. A reversible capillary effect and an irreversible oxidation effect are the driving forces for the residual stress evolution. The lattice expansion of the porous-silicon layer is observed to decrease slightly by x-ray diffraction and the tensile residual stress increases rapidly by micro-Raman spectroscopy, with the change of about 82 MPa for the oxidation effect and the change of 2.78 GPa (enough for cracking) for the capillary effect. Therefore, the capillary effect plays a major role in the residual stress evolution in the stages. A simple microscopic liquid-bridge model is introduced to explain the capillary effect and its reversibility. The capillary emergence has a close relation with a great deal of the micro-pore structure of porous silicon.     

Investigation of External Optical Feedback Resistance of IC—DFB and GC—DFB Lasers Using a Very Simple Experimental set—up

We study the external optical feedback resistance of both index-coupled(IC) and gain-coupled distributed feed-back(DFB) lasers using a very simple experimental set-up.Though IC-DFB lasers with large coupling coefficients are found to be less sensitive to external reflection,they suffer from mode instability at high injection level.On the other hand ,the introduction of gain-coupling mechanism can significantly improve both the immunity of external optical feedback and the single mode yield of the device.     

柱后切换程序升温气相以谱法测定六氟化硫气体中痕量一氧化十？…

本共作提供了用柱后切换和程序曙技术测定纯六氟化硫气体中痕量有毒杂质Ｓ２Ｆ１０Ｏ含量的气相色谱方法。用炎焰光度检测器检测，进样量为１ｍＬ时，Ｓ２Ｆ１０Ｏ最小检测浓度为５×１０＾７（ｍｏｌ／ｍｏｌ）。     

GC/MS分析新疆大麻烟中的大麻类物质

大麻类物质是大麻制品及大麻植物的主要成分。本文采用GC／MS技术分析了新疆大麻烟中的大麻类物质。在莎车的麻烟中检测到16种大麻类组分，如CBD-C3、CBT、Δ^9THCV、CBL、CBD-C4、CBC、CBV、CBD、CBCR、Δ^10sTHC、CBE、Δ^3THC、Δ^9THC、DCBF、CBG和CBN。按照GC／MS鉴定的通用法则，推定了它们的结构。