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51.
支撑液膜在线萃取富集流动注射分光光度法测定水中痕量苯胺 总被引:11,自引:0,他引:11
选用无毒性的磷酸三丁酯为载体,煤油为膜溶剂的支撑液膜萃取体系,建立了支撑液膜在线萃取富集流动注射分光光度法测定河水中苯胺的新方法。对实验条件进行了优化。实验结果表明:在内相pH=2,外相pH=11,膜相组成为15%TBP-85%煤油,富集时间为13min的最优条件下,方法的检出限为0.04mg/L;线性范围为0.1-4mg/L。应用于河水中痕量苯胺的检测,结果满意。 相似文献
52.
A comparison of the results of catalytic and electrocatalytic oxidation of aniline using VS-1 in the presence of H2O2 and TBHP indicates remarkable differences in conversion and selectivity. VS-1 catalyzes the oxidation of aniline selectively
to nitrobenzene (73%) in the presence oft-butyl hydroperoxide (TBHP), while azoxybenzene (95.2%) is formed selectively when H2O2 is used. Cyclic voltammetric studies show a three-step oxidation of aniline to nitrobenzene in H2O2 but in the presence of TBHP only one step is observed. Electrocatalytic oxidation of aniline to nitrobenzene occurs at a
potential 700 mV less than that corresponding to H2O2 as oxidant along with a selectivity of 91.8%. The enhancement of electrocatalytic rate is attributed to the stabilization
of electron deficient transition state. 相似文献
53.
水溶苯胺蓝与蛋白质结合反应的研究及应用 总被引:2,自引:0,他引:2
在pH 2.36的Britton-Robinson(B-R)缓冲介质中,水溶苯胺蓝与蛋白质形成显色化合物,其最大吸收波长为688nm,比试剂本身红移88nm,表观摩尔吸光系数达4.25×105L·mol-1·cm-1(牛血清白蛋白)。制定了四种蛋白质的标准工作曲线,用于人血清样品中总蛋白的测定,结果与溴甲酚绿法一致。 相似文献
54.
Lei Zhang 《Journal of Solid State Electrochemistry》2007,11(3):365-371
Self-doped polyaniline (PAN) film on platinum electrode surface has been synthesized via electrochemical copolymerization
of aniline with orthanilic acid (OAA). Fourier transform infrared, UV–Vis, and elemental analysis indicate the formation of
the copolymer and that the copolymer has the structure of a head-to-tail coupling of aniline and OAA units. It was found that
the internal doping of PAN with OAA can extend the electroactivity of PAN in neutral and even in alkaline media. The obtained
self-doped PAN (PAN-OAA)-coated platinum electrode is shown to be a good surface for the electrooxidation of ascorbic acid
(AA) in phosphate buffer solution of pH 7. The anode peak potential of AA shifts from 0.63 V at bare platinum electrode to
0.34 V at the PAN-OAA-modified platinum electrode with greatly enhanced current response. A linear calibration graph is obtained
over the AA concentration range of 5–60 mM using cyclic voltammetry. Rotating disk electrode voltammetry and chronoamperometry
have been employed to investigate the electrooxidation of AA. The PAN-OAA-modified platinum electrode shows good stability
and reproducibility. 相似文献
55.
研究了不同电极表面结构及有机添加剂对C60电化学还原过程的影响。实验结果表明,富勒烯及其阴离子的电还原活性取决于电极表面结构的影响,即:ipc(多晶)〉ipc[Pt(111)]〉ipc[Pt(110)],且在Pt(111)及Pt(110)晶面上C60^1-及C60^2-的还原电位均有一定的位移。另外,实验结果还表明当溶液中分别添加苯胺及邻氨基酚时,其对C60电还原过程的影响机理将有所不同。 相似文献
56.
用吸光光度法研究了水溶苯胺蓝(AnB)与牛血清白蛋白(BSA)在Britton-Robinson广泛pH缓冲介质中的结合反应,在最佳试验条件下,以试剂空白为参比,AnB-BSA复合物在600nm波长处的吸光度,与BSA的浓度呈良好的线性关系,BSA的线性范围为1.6×10-8~2.4×107mol.L-1,摩尔吸光系数ε=1.34×106L·mol-1·cm-1,Sandell灵敏度为0.051μg·cm-2,BSA的检出限为1.0×10-8mol·L-1,方法具有灵敏度较高、选择性好等特点,用于人血清样品中蛋白质的测定,与溴甲酚绿方法结果一致。 相似文献
57.
Gheorghe Ilia Mihaela Petric Lavinia Macarie Smaranda Iliescu Adriana Popa 《Phosphorus, sulfur, and silicon and the related elements》2013,188(7):1717-1723
Aniline derivatives were phosphorylated in biphase systems using three methods. A comparative study was performed. The best results were obtained when a solid–liquid system was used. This method is the easiest and lead to higher yields (54–81%). 相似文献
58.
59.
《中国化学快报》2021,32(10):3109-3112
A novel hydrogen-bonded organic frameworks (HOFs) FJU-200 has been constructed from N,N'-bis(5-isophthalic acid)naphthalimide (H4L). FJU-200 has a good dual-function of aniline and ultraviolet detection. FJU-200 is the first case of HOF with dual sensing of visual color changes and photoluminescence quenching for aniline detection, and the detection limit of aniline can reach 5.5 × 10−4 mol/L. Under ultraviolet FJU-200 will rapidly change from light yellow to rustic brown, which makes it possible to use FJU-200 to achieve minute-level ultraviolet detection. Moreover, for more convenient use, FJU-200 test papers are prepared. Using them, convenient and fast aniline or ultraviolet detection can be realized. The single-crystal X-ray structures show that compared with the original FJU-200, both PhNH2@FJU-200 and UV-FJU-200 have larger pore sizes, and the dihedral angles of the H2L2− in framework has been changed. 相似文献
60.