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介绍用高效液相色谱外标法测定除草剂二甲戊乐灵中 N- ( 1 -乙基丙基 ) - N-亚硝基 - 3,4-二甲基 - 2 ,6-二硝基苯胺含量的方法。用 C8反相柱 ,水∶乙腈 =35∶ 65为流动相 ,在 2~ 30 μg·ml-1内线性良好 ,其线性回归方程为 Ai× 1 0 -6=1 .2 354× 1 0 4 Wi+ 0 .0 2 0 9,相关系数为 0 .9988,RSD为 0 .0 2 % ,加标回收率为 99.81 %~ 1 0 0 .2 9% ,最低检出量为 65ng 相似文献
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建立了一种同时分离、测定赤砂糖水解产物中的乙酰丙酸(LA)、5-羟甲基糠醛(5-HMF)和甲酸(FA)的高效液相色谱法。采用Agilent TC-C18色谱柱(4.6×250mm,5μm)、Agilent 1200 series VWD紫外检测器,以乙腈:磷酸-磷酸二氢钠缓冲溶液(pH2.6)=15∶85(体积比)为流动相进行分离,检测波长210nm,柱温30℃,流速1mL/min。在此条件下,三种物质的色谱峰面积与浓度线性良好,线性相关系数r在0.9993~0.9999之间,平均回收率为99.02%~106.28%,精密度实验的相对标准偏差为0.25%~1.30%(n=5)。 相似文献
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提出了高效液相色谱法同时测定牛膝配方颗粒中5-羟甲基糠醛和蜕皮甾酮的含量的方法。采用SHIMADZU shim-pack VP-ODS(4.6mm×250mm,4.6μm)柱;用两种不同配比的乙腈和水混合溶液作为流动相,梯度洗脱;检测波长为279nm(5-羟甲基糠醛)和245nm(蜕皮甾酮)。5-羟甲基糠醛和蜕皮甾酮的质量浓度分别在0.390~100mg.L-1和3.125~100mg.L-1范围内与峰面积呈线性关系,方法的检出限(3S/N)分别为1.95,2.01ng。5-羟甲基糠醛和蜕皮甾酮的平均回收率分别为99.7%,99.1%;相对标准偏差(n=5)分别为0.80%,0.67%。 相似文献
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草甘膦与共存有机膦酸的对甲基苯磺酰氯衍生物反相高效液相色谱分离 总被引:7,自引:0,他引:7
建立了一种草甘膦生产母液中的草甘膦和共存有机膦酸的反相高效液相色谱分离方法。化合物与对甲基苯磺酰氯在pH 11.2的磷酸盐缓冲溶液中反应 ,取反应混合物溶液 10 μl进样 ,在C18柱中分离 ,用二极管阵列检测器在 2 4 0nm检测。流动相组成为 0 .0 5mol·L- 1磷酸盐缓冲液(pH 5 .5 ) 甲醇 (80 +2 0 )。草甘膦与其主要代谢物氨甲基膦酸的出峰顺序在pH 4 .2和 5 .5时是相反的。样品中草甘膦浓度在 2~ 4 0 μg·ml- 1范围内与峰面积呈线性关系 相似文献
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制备Ti/SnO2+Sb2O4/PbO2电极,电极的组分及其价态由XRD和XPS表征;该电极可将2,2-二羟甲基丙醛直接电合成2,2-二羟甲基丙酸.应用高效液相色谱分析原料和产物,电化学方法研究电合成影响因素,包括:2,2-二羟甲基丙醛浓度、溶液pH值、反应温度和氧化电位等.在优化条件下(pH=1,C醛=0.10 mol.L-1,t=15℃,E=1.8 V)电合成2,2-二羟甲基丙酸的转化率为58%,选择性36%,电流效率28%.本法为该产物的合成提供了一种新的途径. 相似文献
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反相高效液相色谱法测定硝酸咪康唑及其相关物质的含量 总被引:1,自引:0,他引:1
在LUNAC18色谱柱(250×4.6mmI.D,5μm)上,研究了硝酸咪康唑(Mi conazoleNitrate)及其相关物质(Alpha (2,4 Dichlorophenyl) 2 1H Imidazole 1 Ethanol)的反相高效液相色谱分离检测的最适宜条件,采用乙腈∶缓冲溶液=70∶30(V/V)为流动相,流速为1.0mL/min,检测波长为235nm,经实际样品测定,结果满意。这为跟踪产品的合成工艺,提高产品的质量提供了一个快速有效的检测方法。 相似文献
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反相高效液相色谱测定在乙醇酸和草酸存在下的乙醛酸含量 总被引:4,自引:0,他引:4
采用反相高效液相色谱分离测定了乙醇酸和草酸共存下乙醛酸的含量。色谱柱为Hy-persil ODS-C18柱(4.6 mm×100 mm,5μm),流动相为乙腈-水,检测波长为210 nm。探讨了流动相的pH及其配比对分离度和灵敏度的影响。以峰面积对乙醛酸浓度(g.L-1)作图所得校正曲线的线性回归方程为Y=1.934×103X+0.067×103(r=0.999 9),方法的检出限(2S/N)为5×10-7g.L-1。方法的测定回收率为98.1%~100.4%,相对标准偏差为0.4%。 相似文献
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利用手持技术改进测定乙醇分子结构实验 总被引:1,自引:0,他引:1
利用压强传感器代替排水集气法,改进测定乙醇分子结构实验的仪器装置,并探索最佳反应条件。另外,设计两个空白实验,结合压强变化曲线对实验误差进行相关讨论。 相似文献
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V. I. Bol'shakova L. I. Demenkova É. N. Shmidt V. A. Pentegova 《Chemistry of Natural Compounds》1989,24(6):691-694
The compositions of the neutral diterpenoids of the oleoresins of five species of conifers growing in the Transcarpathia have been studied. It has been found that the oleoresins ofAbies alba M.,Larix decidua M., andPicea excelsa L. contain more than 50% of neutral diterpenoids. The group and qualitative compositions of the oxygen-containing diterpenoids have been determined. In the oleoresins ofAbies alba,Picea excelsa, andPicea abies tertiary alcohols — cis-abienol and isocembrol — predominate, while inLarix decidua the main component is the hydroxy ester larixyl acetate. Primary alcohols related to the resin acids have been found in all the oleoresins investigated. Features of the distribution of diterpenoids according to the species of conifers have been revealed. The results obtained are necessary for the chemotaxonomy of conifers of the family Pinceae.Novosibirsk Institute of Organic Chemistry, Siberian Branch, Academy of Sciences of the USSR. Translated from Khimiya Prirodynkh Soedinenii, No. 6, pp. 812–816, November–December, 1988. 相似文献
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由于石化行业的生产需要,其材质的使用具有多样性和广泛性,经常会出现顾客委托的测试样品的一个或几个元素跨越光谱仪现有测试程序测量范围的情况。本法通过对光谱仪测试原理的认识,根据光谱仪的测试能力及标样的采集,实现了一个或几个元素测量范围的扩展,并对其测量的影响因素进行了研究。 相似文献
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The spectral-polarization characteristics of absorption and phosphorescence of molecules of the initial form of nitro-substituted
indolinospirobenzothiopyran were studied in oriented polyethylene films and in solutions with different polarity. An oscillator
model of the electron transitions responsible for the formation of absorption and luminescence spectra was suggested. It was
established that the principal differences in the spectral and photophysical properties of the compound studied and its oxygen-containing
analog are associated with the fact that the electronegativity of the S atom is lower than that of the O atom.
Translated fromIzvestiya Akademii Nauk. Seriya Khimicheskaya, No. 6, pp. 1143–1146, June, 1997. 相似文献
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Influence of viscosity of medium on processes of oxygen quenching of excited states of mesoporphyrin
E. I. Kapinus V. A. Ganzha B. M. Dzhagarov E. I. Sagun V. B. Pavlenko 《Theoretical and Experimental Chemistry》1989,25(2):146-151
The oxygen quenching rate constants for singlet and triplet excited states of the dimethyl ester of mesoporphyrin IX increase with decreasing viscosity of the medium and reach a maximum at a viscosity of approximately 0.4 mPa·sec, after which the rate constants begin to decrease. The drop in rate constant with increasing fluidity of the medium may be related to a nonequilibrium character of the elementary act in the interaction of the reactants in the solvent cage. In viscous media such as isopropyl alcohol, isobutyl alcohol, and isoamyl alcohol, the reaction radius is greater than the sum of the radii of the reacting particles. The long-range character of these processes is due to the relatively weak dependence of the quenching probability on distance.Translated from Teoreticheskaya i Éksperimental'naya Khimiya, Vol. 25, No. 2, pp. 161–167, March–April, 1989. 相似文献
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