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1.
《液相色谱法及相关技术杂志》2012,35(12):1921-1928
Abstract The stability constants of the complexes formed between diethylenetriamine and the metal ions -V, Th, As, Pb, Zr and Se have been determined by pH metric method and these values, together with the stability constants for the metal ions -Co, Zn, Cd, Hg, Cu, Ni and Ag already reported, have been utilised to show their correlation with chromatographic behaviour of these metal ions on silica gel G plates impregnated with diethylenetriamine. 相似文献
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《液相色谱法及相关技术杂志》2012,35(9):1877-1902
Abstract New sorbent phases have been developed by impregnating silica gel G with different inorganic salts for the analysis of metal ions by thin layer chroma to graphy in carboxylic acids media. Thin layers prepared from silica gel G impregnated with ammonium chloride or barium nitrate show the unusual selectivity towards metal ions in comparison to the thin layers prepared from plain silica gel G or silica gel impregnated with silver nitrate or aluminium nitrate. Many qualitative separations 相似文献
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《液相色谱法及相关技术杂志》2012,35(6):867-883
Abstract Several comparative chromatoqraohic systems described in the literature may he useful for facilities dealing with a relatively large number of different antibiotics, such as clinical laboratories engaged in the identification of antbiotics in human serum; research laboratories screening for new antbiotics; and regulatory agencies testing drug preparations. Ishida et al. (1) introduced the “summarized paper chromatogram” which is obtained when Rf values computed from several solvent systems are represented graphically. Retina (2) classified 62 antibiotics on the basis of graphical representation using paper chromatographic techniques. Later Betina and Nemec (3) used paper chromatography (PC) with buffered solutions for the classification of antibiotics. Snell et al. (4) used paper chromatographic classification of antibiotics in crude preparations. 相似文献
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《Analytical letters》2012,45(10):813-816
Abstract A scheme for the TLC separation of twelve inorganic ions on Silica Gel-Pyridinium Tungstoarsenate impregnated plates by using a mixture of butanol-acetic acid-ethyl alcohol-acetone-water (60:10:30:40:10) or isopropanol acetic acid-acetone (60:5:35) as developing system and employing 0.5% dithizone in chloroform as visualization reagent is described. Examples of separations of binary, ternary and pentnary mixtures are given. 相似文献
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《液相色谱法及相关技术杂志》2012,35(12):1913-1919
Abstract Thin layer chromatographic detection, separation and determination of Ti(IV), UO2(II), Au(III) and Hg(II) complexes with λ - and β - naphthylanils of methylenediglyoxal have been made on silica gel layers. No locating agent was used as the complex spots were self evident in day light. 相似文献
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《液相色谱法及相关技术杂志》2012,35(8):1483-1494
Abstract A thin layer partition chromatographic method has been developed for separation of Fe(III), Ni(II), Zn(II), Cu(II), Pb(II) and Mn(II) on thin layers of silica gel-G as an adsorbent. The Rf values were determined using 0.01–0.2 aqueous solution of sodium thioglycolate as a mobile phase. The dependence of Rf values on the migration time, pH and concentration of mobile phase has been studied. The optimum conditions for possible 3-component separation have been determined. Metal ions have been separated, detected, eluted and quantitatively determined by atomic absorption spectroscopy. The present method was applied to the separation and determination of zinc in forensic samples. 相似文献
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《液相色谱法及相关技术杂志》2012,35(12):1807-1827
Abstract Procedures are described for the thin layer chromatographic (TLC) analysis of coal-derived liquids. After solvent selection using Selectosol (1) radial TLC, a series of compounds typically found in coal liquids was used to demonstrate their elution behavior on silica gel. It was determined that unactivated (Brockman 4) silica plates series developed with isooctane/tetrahydrofuran (THF) (80:20, v/v) provided the best separation. The order of elution was saturate >hydroaromatic >polynuclear aromatic (PNA)>phenols ≥ nitrogen bases. The use of two-dimensional TLC with reverse phase and silica contiguous on the same plate (Whatman Multi-K) is discussed for the rapid separation and identification of coal liquid components. Trimethylsilyl ether derivatives were prepared of phenols and alcohols present in coal conversion products. This technique proved most useful in that the TMS-derivatives behaved similarly to their parent PNA, in order of elution, on silica plates using a moderately active mobile phase (isooctane: THF,80:20, v/v). TLC and the reactions described provide a semi-quantitative measure of the degree of hydrogenation of coal-derived liquids. 相似文献
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The Tridentate chelating, system present in Salicylidine o-amino benzoic acid was used for complexation with Cu (11), Ni (11), Co (11) and Pd (11). The thin-layer chromatographic (TLC) detection and separation of these complexes on Silica gel (G) layers was studied. The coloured spots of the complexes were quite visible without any visualizing agent. A maximum of four complexes could be resolved and identified. The coloured zones were eluted with solvent and characterise by elemental analysis and spectral studies. Colour of the complexes at λmax was measured. 相似文献
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《液相色谱法及相关技术杂志》2012,35(6):937-947
Abstract A reverse phase thin layer partition chramotography has been performed on metal ions using silica gel G as an adsorbent. The effect of chlorosubstituent groups on the migration of cations has been studied. The use of aqueous solutions of acetic acid, monochloro, dichloro and trichloro acetic acid in the solvent system revealed profound effect of substituent groups on the Rf values of metal ions. The effect of concentration and pH of the mobile phases have been studied. Many qualitative ternary separations have been sucessfully achieved. 相似文献
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《液相色谱法及相关技术杂志》2012,35(7):1253-1264
Abstract The adsorption behaviour of 47 metal ions has been studied in aqueous HCl systems using stannic ersenate layers. The effect of solvent pH on Rf alongwith the complexation effect of HCl has been investigated. On the basis of Rf values the KSP of some metel arsenates have been predicted. HCl has been utilized to resolve some binary and ternary mixtures such as Be2+ - Mg2+, Zr4+ - La3+, Th4+ - Ce4+, Th4+ - UO2+ 2, Cr3+ - Mo6+ or W6+, Sb3+ - Bi3+ - Cd2+ and Ag+ - Cu2+ - Cd2+. 相似文献
12.
《液相色谱法及相关技术杂志》2012,35(16):3489-3493
Abstract A scheme for the TLC separation of twenty five dyes on silica-gel-zinc acetate impregnated plates using a mixture of n-butanol-benzene-ethylacetate as developing system is described. Examples of separations of dyes in mixtures are reported. 相似文献
13.
《液相色谱法及相关技术杂志》2012,35(16):2991-2998
Abstract Thin layer chromatography of DMSO complexes of some metal ions in a large number of solvent systems was carried out. The specific separation of DMSO complex of Hg2+ from others have been achieved in ethyl acetate media. Other important separations of metal - DMSO complexes are : Ni2+ - Co2+, Ce3+ - La3+ and Zn2+ - Mn2+. Some other possible separations are also reported. 相似文献
14.
《液相色谱法及相关技术杂志》2012,35(9):1731-1738
Abstract Rf, values of DMSO complexes of some metal ions in twelve solvent systems are given. The separation of Zn and Hg DMSO complexes from others have been achieved in Water and in n-butyl alcohol respectively by using paper chromatography. Some other possible separations are also reported. 相似文献
15.
薄层色谱分离库仑滴定法测定杀虫单 总被引:7,自引:0,他引:7
本文提出了用薄层色谱库仑滴定法测定杀虫单(SCD)[CH3)2NHC H(CH2S2O3)2Na.H2O]的方法。试样中的各成分用上行展开法的硅胶G板上分离,用碘蒸气或喷洒PdCl2溶液确定SCD的位置,该试剂与杀虫单反应生成橙黄色产物。 相似文献
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《液相色谱法及相关技术杂志》2012,35(11):2073-2079
Abstract A systematic study of the chromatography of metal ions on collidinium tungstoarsenate papers has been performed using seven different mixed solvent systems. Rf values of 30 metal ions have been determined by ascending technique and are discussed. The study demonstrates that specific extraction of both Sn(ii) and Sn(iv) is possible in 0.1 mol dm?3 HNO3 in 80% (v/v) 1-propanol and their mutual separation can be carried out in solvent system 1 mol dm?3 HCl in 33% (v/v) 1-propanol. In addition some binary and ternary separation of metal ions have also been achieved on these papers. For a comparison Rf values on plain papers have also been determined in all the solvent systems. 相似文献
18.
研究了用薄层色谱法分离和鉴别在合成N-乙基-对-薄荷烷-3-甲酰胺中所得粗品的各组分。试验表明硅胶H(60型)为最佳吸附剂。敷有此吸附剂的薄层层析板经在110℃活化2 h,所用展开剂为以5与1之比混合的石油醚和丙酮混合溶剂,展开距离最少为14.00 cm,经展开后粗品中4组分得到很好的分离。展开层用碘铋化钾(KBI4)溶液和碱性高锰酸钾溶液喷洒即可清楚地观察到4个色斑,其Rf值依次为0.82,0.67,0.50和0.33,即Rf为0.33的色斑取下作元素分析,所得结果证明此组分即是N-乙基-对-薄荷烷-3-甲酰胺。 相似文献
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药物分析中薄层色谱的方法认证 总被引:2,自引:0,他引:2
在药物分析中,针对所要求的性能参数,对一个薄层色谱程序的各个环节必须进行的认证方法和认可标准进行了讨论。建议当提出结果报告时,应附上关于对方法的认证参数和认证方法的说明。 相似文献