氨基甲酸酯类农药残留的加压毛细管电色谱法测定

采用加压毛细管电色谱 -紫外检测法 ,建立了速灭威、克百威和残杀威三种氨基甲酸酯类农药的同时分离检测方法。采用反相 C18毛细管电色谱柱 (3μm,2 0 0 mm× 75 μm I.D.) ,以乙腈∶ PBS(5 mmol/ L,p H6 .5 0 ) =30∶ 70 (V/ V)为流动相 ,检测波长 2 2 0 nm,流速 10 0 μL/ min,柱压 6 .9MPa,在电色谱柱末端施加10 .0 k V负电 ,三种物质在 10 min内基线分离。该法用于蔬菜中速灭威、克百威和残杀威的残留分析研究 ,效果令人满意     

紫外光辐照对偶氮苯光谱特性的影响

采用紫外可见吸收、稳态荧光光谱和荧光衰减测量技术,观察了4-硝基-4'-氨基偶氮苯(NAA)在氯仿溶液中的光致变色现象及分子的跃迁能级和能级寿命。结果表明:NAA分子的顺反异构化反应并非一级反应;分子处于反式异构体和顺式异构体的跃迁能分别为255.6,240.2 kJ/mol;分子处于反式异构体的能级寿命为0.02 ns,处于顺式异构体的能级寿命为3.54 ns。顺反异构体的含量、NAA分子之间及NAA分子与溶剂分子之间的相互作用影响NAA分子激发态的能级寿命。     

柱前衍生化RP-HPLC拆分盐酸洛美沙星对映异构体

以2,3,4,6-乙酰基-β-D-吡喃葡萄糖基异硫氰酸酯(GITC)为柱前衍生化试剂,建立了盐酸洛美沙星对映体柱前衍生化RP-HPLC拆分方法。采用了C18(4.6×250mm,5μm,Bnentnach)为色谱柱,在流动相为甲醇∶(3mmol.L-1四丁基溴化铵水溶液∶5mmol.L-1Na2HPO4的水溶液=1∶2)=25∶75,流速为1mL·min-1,检测波长284nm的色谱条件下,盐酸洛美沙星的非对映体在1.0—27.5μg.mL-1的浓度范围内有良好的线性关系,日内、日间精密度都3%,且获得了基线分离。该种方法能用于盐酸洛美沙星的手性拆分,也为盐酸洛美沙星的光学异构体的测定提供了参考。     

高效液相色谱法测定杜仲中京尼平甙酸

ODS- C18色谱柱 (2 0 0 mm× 4 .6 mm,5 μm) ,甲醇 -水 -冰乙酸 (12∶ 87∶ 1)为流动相 ,高效液相色谱法测定了杜仲中京尼平甙酸的含量 ,考察了流动相组成、酸性添加剂对色谱分离效果的影响 ,流速 1.0 m L/ min时 ,京尼平甙酸的容量因子 k′在 2— 3之间 ,分离度大于 1,保留时间为 6 .9min,样品分析时间在 30 min之内 ,满足色谱分析要求。京尼平甙酸在 0 .0 36— 1.36 mg/ m L时 ,色谱峰面积与样品量呈良好的线性关系 ,线性方程为 A=6 375 6 132 72 6 0 C,相关系数 r=0 .9996。     

高效液相色谱法测定小儿盐酸二氧异丙嗪冲剂的含量

采用高效液相色谱法测定盐酸二氧异丙嗪的含量。色谱柱为 DIKMATMRPC18(4 .6 mm× 2 0 cm,5 μm) ,流动相为乙腈 - 0 .5 %磷酸二氢钾 -三乙胺 (5 0∶ 5 0∶ 0 .2 ) ,用磷酸调 p H值至 6 .8± 0 .1;流速为1.0 m L/ min,检测波长为 2 6 4nm。该法回收率为 99.6 % ,RSD=0 .6 1%。盐酸二氧异丙嗪在浓度为0 .0 184 8— 0 .0 4 312 mg/ m L范围内线性关系良好。相关系数为 r=0 .9999。该方法操作简便 ,结果准确可靠。     

高效液相色谱法测定富马酸异哌丙吡仑

采用高效液相色谱法测定富马酸异哌丙吡仑的含量。色谱柱为 DIKMATMRPC18(4 .6 mm× 2 0 cm,5 μm) ,流动相为乙腈 - 0 .5 %十二烷基硫酸钠 -三乙胺 (5 5∶ 4 5∶ 0 .2 ) ,用冰醋酸调 p H值至 7.0± 0 .1;流速为 1.0 m L/ min,检测波长为 2 6 5 nm。该方法回收率为 99.8% ,RSD=0 .4 4%。富马酸异哌丙吡仑在浓度为0 .0 5 92 8— 0 .1383mg/ m L范围内线性关系良好。相关系数为 r=0 .9997。该方法操作简便 ,结果准确可靠。     

亚叶酸钙与对硝基酚荷移反应的研究

本文主要研究了在水溶液中亚叶酸钙与对硝基酚发生荷移反应生成稳定的 1∶ 1络合物 ,络合物的最大吸收波长为 4 0 2 .2 nm,表观摩尔吸光系数为 ε=5 .2 5 5× 10 2 L· mol-1· cm-1,线性范围为 5 0—12 0 0 μg/ m L。回收率为 99.5 8%— 10 2 .6 0 % ,相对标准偏差为 1.4 3%。方法简单、快速、准确度高 ,可用于亚叶酸钙制剂含量的测定。     

高效液相色谱法测定2-苯基-4-对甲苯基-1,5-苯并硫氮杂-α-(丁二酰亚胺基)-β-内酰胺

本文采用 Hypersil- ODS2 (4 .6mm× 2 5 0 mm,5μm)色谱柱 ,乙腈 -水 (70∶ 30 )流动相 ,2 4 2 nm测定波长 ,建立了测定 2 -苯基 4 -对甲苯基 - 1,5 -苯并硫氮杂 艹卓 -α- (丁二酰亚胺基 ) -β-内酰胺高效液相色谱法。该法线性范围为 0— 0 .1mg/ m L,回归方程 A=2 .11× 10 8C- 3.10× 10 5,相关系数 r=0 .9995 ,相对标准偏差为0 .2 4 % (C=0 .0 6mg/ m L,n=5 ) ,检出限为 0 .0 5 μg/ m L。平均回收率在 97.1%— 10 2 .4 %之间。该法重现性好、灵敏度高、简单、快速、准确     

反相高效液相色谱法测定1-(4-硝基苯)-3-(5-溴-2-吡啶)-三氮烯

ZORBAX Eclipse XDB- C8(4.6× 1 5 0 mm,5 μm)色谱柱 ,乙腈流动相 ,流速 0 .6 0 m L/min,检测波长4 2 0 nm,反相高效液相色谱法测定 1 - (4-硝基苯 ) - 3- (5 -溴 - 2 -吡啶 ) -三氮烯。该法的线性范围为 1—1 0 .0 μg/m L,线性回归方程为 A=5 .91 5 4 .4 37C,相关系数 0 .9989,相对标准偏差为 0 .8973%(C=7.2 0 μg/m L,n=5 ) ,检出限为 0 .0 2 872 μg/m L,平均回收率在 93.2 %— 1 0 2 .2 %之间。     

高效液相色谱法测定金盏菊中叶黄素

KNAUER Eurospher- 1 0 0 C1 8(3.9mm× 30 0 mm,4 .6 μm)色谱柱 ,以乙腈 -甲醇 -乙酸乙酯混合液为流动相 ,流速 1 .0 m L/ min;检测波长 4 6 0 nm;柱温 2 5℃ ,高效液相色谱法测定金盏菊中叶黄素含量。校准曲线法定量 ,检出限为 3.0 mg/ m L。叶黄素含量在 8— 6 4mg/ L之间线性关系良好 ,r=0 .9999,RSD=1 .4 % ,回收率在 97%— 1 0 1 %之间。本法适合叶黄素产品中叶黄素含量的测定     

BSA-SDS-Ag聚合物纳米微粒的制备及其水凝胶性质的研究（Ⅰ）

报道了BSA－SDS－Ag聚合物纳米微粒的制备及水凝胶的性质,用X射线衍射（XRD）、透射电镜（TEM）、傅里叶变换红外（FT－IR）光谱考察了这种聚合物微粒的结构,微粒粒径32nm左右,用UV／Vis光谱及SEM考察了冰凝胶的性,表明Ag^ 离子先与BSA产生化学键合,再学原了Ag粒,进行聚合成网状结构的聚合物。     

Infrared Quantitative Study of Acetylation of Microspheres of Polystyrene

Abstract

Fourier transform infrared spectroscopy has been used to study quantitatively the acetylation of monodisperse polystyrene microspheres with diameters ranging from 7 to 9μm. The CH₂ stretching infrared vibration mode at 2921 cm^?1 was used as the internal intensity standard. The acetylation extent could be easily measured by comparing the relative intensities of the bands of acetyl group (1678, 1415, 1359 cm^?1) or the bands due to the para-substituted benzene ring to the band at 2921 cm^?1 from the calibration curve.     

Application of the method of X-ray fluorescence analysis for determination of the degree of chlorination of copper phthalocyanin

To whom correspondence should be addressd.     

混合物物态方程的计算

 在采用体积相加原理计算混合物物态方程的基础上,建立了一种物理模型确定混合物温度。根据混合物中各组分温度和压强平衡条件,采用压强-密度迭代方法计算给出混合物物态方程,编制了两种组分的混合物物态方程计算程序。为检验建立的温度模型的合理性及程序的有效性,分析了不同密度、温度状态的氢（H2）和钨（W）组成的混合物状态参量,计算了以下情形及其组合情形的混合物物态方程：H₂和W以不同质量比混合;质量比固定,单组分状态不同;温度区间和密度区间不同。研究表明:实际应用中在建立的混合物温度模型基础上确定的混合物物态方程是合理的。     

傅里叶望远镜外场实验性能改进和结果分析

为了实现对傅里叶望远镜成像系统更接近实际的仿真,改进了外场实验系统结构。采用反射式目标,利用准直扩束镜替代空间滤波器和准直透镜,使用大靶面电荷耦合器件作为监视器。在无大气和包含200m水平大气两种情况下,分别对2.5mm的4种不同空间频谱分布目标进行实验。实验选用9×9,17×17,33×33和65×65傅里叶分量分别进行重构。最高成像角分辨率为3.5″。结果表明含大气与无大气重构结果的Strehl比值相近,从而证明傅里叶望远镜成像系统能够克服下行链路低阶大气扰动的影响。     

Optical investigation of dynamics of phenomena of laser-based lithotripsy

Using time-resolved high-speed shadowgraphy, the dynamics of phenomena due to laser-based lithotripsy is studied. Collapsing mechanism of bubble formed therein is investigated. In order to study the mechanism, the optically implemented mathematical morphology is applied. The study of the shape of the plasma and the collapsing region of the bubble of fluid that we are studying can possibly be used for practical application for laser-based lithotripsy.     

Some peculiarities of deep PT-changes of physical properties of rocks

Abstract

Results of petrophysical PT-experiments are discussed. Used is a method of program modeling of experiments. Thermobaric dependence of elastic properties of acid, intermediate and basic rocks as well as elastic wave velocity anisotropy in amphibolites is studied. Deep PT-regimes effect on electrical resistance of dry and water-saturated rocks has been studied. PT-conditions of full loss of the remanent magnetization of volcanites have been established. A number of regional petrophysical lithosphere models has been constructed.     

分子费米共振拉曼光谱强度分析

测量了CCl₄和CS₂分子的Raman光谱。用Bertran理论和群论等相关理论对其光谱强度进行了分析,获得了发生费米共振分子的拉曼光谱强度的特殊规律： (1)发生费米共振的基频和倍频(和频)间发生能量转移,两光谱强度大小相互接近,当发生费米共振的基频和倍频(和频)间距离很小时,两发生费米共振的光谱强度相等(R=1);(2)能出现倍频光谱强度高于其基频光谱强度;(3)也会观测到费米共振光谱,而观测不到参与费米共振的和频中的基频光谱。此研究对化学、材料科学中的分子结构、材料成分等研究中的谱线认证、归属有很好的参考价值。     

Symmetry of Lagrangians of nonholonomic systems of non-Chetaev’s type

This paper studies the symmetry of Lagrangians of nonholonomic systems of non-Chetaev's type. First, the definition and the criterion of the symmetry of the system are given. Secondly, it obtains the condition under which there exists a conserved quantity and the form of the conserved quantity. Finally, an example is shown to illustrate the application of the result.     

Simulation of the contours of spectral lines of closed-ARC radiation

Simulated contours of self-reversed lines of Tl at 535 nm (7²S_1/2−6²P_3/2) and 378 nm (7²S_1/2-6²P_1/2) in alternating-current closed-arc radiation in mercury vapor with an addition of Tll were compared with experimental contours. It is shown that while a single self-reversed contour has many different sets of model parameters that ensure coincidence of experimental and calculated profiles, in the case of operation with a large data file of contours that correspond to different directions of observation along chords perpendicular to the discharge axis, and with different lines that have a common level, such a set of parameters becomes virtually unique. Instantaneous spatial distributions of Hg and Tl atoms in the ground state and of Tl atoms in the 6²P_3/2 state are determined and the parameters of the van der Waals broadening of the 7²S_1/2 level are found. It is shown that a considerable “red” shift of absorption contours in the outer layers of the discharge is observed. The results obtained contradict the presumed existence of local thermodynamic equilibrium in the given discharge. Reported at the Conference “Plasma Physics and Plasma Technologies,” Minsk, September 15–19, 1997 Petrozavodsk State University, 33, Lenin Ave, Petrozavodsk, 185640, Russia. Translated from Zhurnal Prikladnoi Spektroskopii, Vol. 65, No. 5, pp. 761–768, September–October, 1998.