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用胶束液相色谱/安培检测器检测尿样中的扑热息痛及其主要水解产物4-氨基苯酚。采用14.5μm的碳纤维电极作为工作电极,以高于临界胶束浓度的阴离子表面活性剂十二烷基磺酸钠(SDS)作为液相色谱的流动相,尿样直接进样分析,扑热息痛和4-氨基苯酚的检测限分别为0.13nmol/L及0.73nmol/L(S/N=2)。 相似文献
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新显色剂1-(对-偶氮苯)-3-(2-噻唑)-三氮烯与锌显色反应的研究及应用 总被引:3,自引:0,他引:3
本文研究了新显色剂1-(对-偶氮苯)-3-(2-噻唑)-三氮烯在非离子表面活性剂TritonX-100存在下,与锌(Ⅱ)显色反应的适宜条件。结果表明,在pH13.0~14.0范围内,锌(Ⅱ)与题示试剂形成1:3的稳定粉红色配合物,其最大吸收波长为545nm,试剂的最大吸收波长为463nm。配合物表现摩尔吸光系数在545nm处为9.6×10 ̄4L·mol ̄(-1)*cm ̄(-1);0~24μg/25mLZn符合比耳定律。该试剂对锌的选择性良好。方法用于铝合金中锌的直接测定,结果令人满意。 相似文献
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作者以新研制的4-(6-甲基-2-苯并噻唑偶氨)间苯三酚为柱前衍生试剂,用含10mmol/L的pH6.80的HAc-NaAc缓冲溶液,10mmol/LTBA·Br和1×10 ̄(-4)mol/LEDTA的甲醇-水溶液(78:22,V/V)作流动相,在C_(18)柱上,11min内反相HPLC分离测定了Cr(Ⅵ),V(Ⅴ)Co(Ⅱ),Ni(Ⅲ)。当S/N=3时,其检出限分别是V(Ⅴ)5.45ng,Co(Ⅱ)1.09ng,Ni(Ⅱ)1.50ng,Cr(Ⅵ)1.70ng。 相似文献
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The reaction of the rifle cyclic complex (1) with sodium amalgam in THF resulted in the expected cleavage of the Fe-Fe bond to afford his-sodium salt ( Me2SiSiMe2 ) [η^5-C5H4Fe(CO)2]2 (4). The latter was not isolated and was used directly to react with MeI, PhCH2Cl, CH3C(O)Cl, PhC(O)Cl,Cy3SnCl (Cy= cyclohexyl) or Ph3SnCl to afford corresponding ring-opened derivatives (Me2SiSiMe2) [η^5-C5H4Fe(CO)2]2 [5, R=Me; 6, R=PhCH2; 7, R=CH3C(O); 8, R=PhC(O); 9, R = Cy3Sn or 10, R = Ph3Sn ]. The crystal and molecular structures of 10 were determined by X-ray diffraction analysis. The molecule took the desired ant/ conformation around the Si-Si bond. The length of the Si--Si bond is 0.2343(3)nm, which is essentially identical to that in the cyclic structure of 1[0.2346(4) tun]. This result unambiguously demonstrates that the Si--Si bond in the cyclic structure of 1 is not subject to obvious strain. 相似文献
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铁、钴和镍的2-(6-溴-2-苯并噻唑偶氮)-5-二乙氨基苯酚螯合物的高效液相色谱研究 总被引:1,自引:0,他引:1
分别于Shim-pack PNH_2和Zorbax CN柱上,研究了Fe(Ⅱ)、Co(Ⅱ)和Ni(Ⅱ)与6-Br-BTADAP之螯合物的HPLC分离条件;提出了于Shim-pack PNH_2柱上,用环己烷-乙酸乙酯-异丙醇(48:40:12,V/V)作流动相(1.0m/min)的HPLC同时测定此三元素的新方法。校正曲线之线性范围是0.025~4.0ppm Fe(Ⅱ)、0.1~2.0ppm Co(Ⅱ)和0.05~2.5ppm Ni(Ⅱ),其绝对检出限分别是0.61、0.40和0.20ng。异离子:Cd(Ⅱ)、Cu(Ⅱ)、Hg(Ⅱ)、Mn(Ⅱ)、Pb(Ⅱ)、Zn(Ⅱ)和Fe(Ⅱ),无干扰。本方法已应用于实际样品的分析。 相似文献
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用2-(5-硝基-2-吡啶偶氮)-5-二乙氨基苯酚反相高效液相色谱测定痕量铁、钴、镍 总被引:1,自引:0,他引:1
本文采用新试剂2-(5-硝基-2-吡啶偶氮)-5-二乙氨基苯酚(5-NO_2-PADAP)为柱前衍生试剂,不需对离子试剂,用含40mmol/L 的 pH6.0的乙酸-乙酸钠缓冲溶液和10~(-4)mol/LEDTANa_2的甲醇-水溶液(67.5:32.5)为流动相,在 ODS 柱上,20min 内 HPLC 测定了 Fe(Ⅲ)、CO(Ⅱ)和 Ni(Ⅱ)的5-NO_2-PADAP 的络合物,这是同类衍生试剂中最简单流动相体系。当信噪比 SNR=2时,检出限分别为0.17、0.17和0.09ng/ml。是同类体系中灵敏度最高的。方法用于同时测定硝酸试剂和茶叶中的铁、钴和镍,结果良好。 相似文献
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新显色剂2-(2-噻唑偶氮)-5-二乙氨基苯甲酸分光光度法测定微量钴 总被引:4,自引:0,他引:4
近年来,杂环偶氮苯甲酸类显色剂取得了较快的发展。由于氨基取代结构对试剂性能有较大的影响[1],因此本文合成了新显色剂2-(2-噻唑偶氮)-5-二乙氨基苯甲酸,(TAEB)并研究了它与钴的显色反应。 相似文献
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《Analytical letters》2012,45(3):623-631
ABSTRACT A chromatographic method has been established for the determination of trace amounts of cobalt by preconcentration on Amberlite XAD-16 resin as cobalt/4-(2-Thiazolylazo) resorcinol (TAR) complexes. The conditions (e.g. pH, resin amounts, matrix ions) affecting the recovery of cobalt from aqueous solution were studied. The method has been employed for the determination of cobalt in natural water samples. 相似文献
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《Analytical letters》2012,45(10):741-751
Abstract Procedures are described for the determination of serum iron and iron binding capacity using the chromogenic reagent 4-(2-pyridylazo) resorcinol (PAR). The high molar absorptivity of the iron (II) PAR complex makes possible an approximate two fold increase in sensitivity over previous methods. The described procedures have few interferences, and give linear results for samples containing 0 – 750 μg/dl of iron. 相似文献
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4—(2—噻唑偶氮)—2,4—二氨基甲苯与铑显色反应的研究 总被引:1,自引:0,他引:1
本研究了4-(2-噻唑偶氮)-2,4-二氨基甲苯(简称TADAT)与铑的显色反应。在pH=3.7~4.9的酸度范围内试剂与铑形成红色络合物,加入无机酸后色泽加深,络合物的最大吸收位于590nm,表观摩尔吸光系数为1.1×10^5L·mol^-1·cm^-1,其组成为Rh:TADAT=1:3。铑浓度在0~12μg/25ml范围内服从比尔定律。该方法用于模拟样中铑的测定,结果满意。 相似文献
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借2—(2—咪唑偶氮)—苯酚—4—磺酸螯合物和液相色谱分离铬,钼,钒和钴 总被引:3,自引:0,他引:3
研究了离子对反相高效液相色谱分离铬(Ⅱ)、钼(Ⅵ)、钒(Ⅳ)和钴(Ⅱ)之2-(咪唑偶氮)-苯酚-4-磺酸螯合物的柱前衍生条件;检测波长的选择;流动相中有机溶剂、四丁基溴化铵及酸度的影响,并讨论了15种外来离子的干扰情况。本方法已用于合金钢和钒喳的分析。检测限为0.4ng铬、1.2ng钼和0.1ng钒。 相似文献
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微柱高效液相色谱法测定环境样品中的铁、钴、镍、铜、锌、锰 总被引:1,自引:0,他引:1
研究了用 2-(2-喹啉偶氮 )-间苯二酚 (QAR)为柱前衍生试剂 ,以WatersXterraTM RP18(1 .0×5 0mm ,2. 5 μm)微柱为固定相 ,60 %的甲醇 (内含 0 . 5 %的醋酸 )为流动相 ,高效液相色谱分离、二极管矩阵检测器测定铁、钴、镍、铜、锌和锰的方法。根据信噪比 (S N =3 )得各金属离子的检测限分别为 :铁3 μg L、钴 4μg L、镍 2 μg L、铜 4μg L、锌 5 μg L、锰 8μg L ,方法用于环境样品中痕量铁、钴、镍、铜、锌、锰的测定 ,相对标准偏差在 1 . 6%~ 3 . 5 %之间 ,标准回收率为 93 %~ 1 0 7%。 相似文献
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《Analytical letters》2012,45(17):1497-1512
Abstract Hexamethylphosphoramide (HMPA) gives, in aqueous solutions in the presence of SCN? ions, complexes with many metal ions, which absorb in the visible region of spectrum. The spectra have been studied in function of ligand concentration and pH for Co, Ni and Fe complexes. For the Co complex an equation was found that describes the behaviour of the absorption vs. SCN? and HMPA concentration. Absorption follows Lambert-Beer law and can be used for analytical determinations. Analysis of solutions containing Ni and Co in various ratios of concentration has been performed and results are discussed. Co, Ni and Fe content of an alloy has been measured by this way. 相似文献