共查询到19条相似文献,搜索用时 109 毫秒
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新显色剂2—[2—(6—甲基—苯并噻唑)偶氮]—5—二甲氨基苯磺酸与钯(Ⅱ)… 总被引:8,自引:0,他引:8
合成了新试剂2-[2-(6-甲基-苯并噻唑)偶氮]-5-二氨基苯磺酸,并研究了其与钯(Ⅱ)的显色反应。实验表明,该试剂与钯(Ⅱ)反在生成1:1蓝色水溶性络合物,在阴离面活性剂十二烷基硫酸钠(SDS)存在下可稳定24h,其最大吸收波长为615nm,表观摩尔吸光系数为7.94×10^4.mol^-^1.cm^-^1。钯量在0-0.8μg/ml范围内符合比尔定律。本法是目前测定钯(Ⅱ)的高灵敏度显色反应 相似文献
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新试剂二溴对硝基苯基重氮氨基—4—苯基—2—噻唑的合成及其与钯显色反应的研 总被引:7,自引:1,他引:7
报道了新试剂二溴对硝基苯基重氮氨基-4-苯基-2-噻唑的合成方法,并研究了在表面活性剂CPC存在下,该试剂与钯(Ⅱ)的显色反应,结果表明,在pH6.4~7.8范围内,钯(Ⅱ)与该试剂可形成1:2灰紫色的配合物,其最大吸收波长位于650nm,表观摩尔吸光系数为7.02×10^4L.mol^-1.cm^-1钯量在0~22μg/25mL,范围内符合比尔定律,该方法已用于Pd-C催化 微是钯的测定,结果满 相似文献
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双噻唑偶氮试剂BDTADAB与钯显色反应的研究和应用 总被引:3,自引:0,他引:3
研究了新的双噻唑偶氟试剂2,6-二偶氮(4,4′-(双间苯二胺)-苯骈(1,2-d,4,5-d)二噻唑(BDTADAB)与钯的显色反应,在5.8mol/L硫酸介质中,钯与试剂生成的络合物最大吸收波长为604nm,表观摩尔吸收系数为4.2×10^4L.mol^-1.cm^-1钯在0~16μg/25mL范围内符合比尔定律,常见金属离子及铂,金等贵金属离子均不干扰钯的测定,该方法具有简便,快速,选择性高 相似文献
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新显色剂2—(5—硝基—2—吡啶偶氮)—5—二甲所苯胺与钯显色反应的研究及其… 总被引:5,自引:1,他引:5
用新合成的偶氮试剂2-(5-硝基-2-吡啶偶氮)-5-二甲氨基苯胺研究了光度法测定钯的反应条件。结果表明,在0.45-1.2mol/L盐酸介质中,钯与试剂形成稳定的蓝色配合物,其最大吸收波长位于621nm处,表观摩尔吸收系数为9.4×10^4L.mol^-1.cm^-1,配合成的组成为Pd:5-NO2-PADMA=1:2,钯浓度在0-10μg/10mL范围内符合比尔定律。本方法是目前测定钯的高灵敏 相似文献
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在pH6.1~6.7的磷酸盐介质中,钯(Ⅱ)与二溴羟基苯基荧光酮-溴化十六烷基三甲铵于室温下反应,生成水溶性和稳定性皆佳的紫色三元配合物,最大吸收波长为600nm,对比度为70nm,表现摩尔吸光系数为9.48×10 ̄4L.mol ̄(-1)’cm ̄(-1),桑德尔灵敏度为1.12×10 ̄(-3)μg.cm ̄(-2),钯含量在0~7.0μg/10mL范围内服从比尔定律。据此提出了一个灵敏、简便分光光度法测定钯的新方法,用于合成试样和贵金属合金中微量钯的测定,结果满意。 相似文献
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Bo Peng Xiaojun Guo Xuefen Mao Jinzhang Gao 《Central European Journal of Chemistry》2007,5(3):912-921
The solvent extraction behavior of precious metal palladium with 1-phenyl-3-methyl-4-benzoyl-5-pyrazone (PMBP) into molten
paraffin wax has been studied in the temperature range from 55 to 75 °C. The complex consisting of PMBP and palladium was
extracted into molten wax phase in the pH range from 1.0 to 3.5 at 60 °C. The extraction efficiency was up to 97% at the experimental
pH. The stoichiometry of the extracted species of palladium was determined on the basis of slope analysis method. The effects
of time to achieve equilibrium, temperature, and extractant concentration on the extraction were discussed. The thermodynamic
data indicate that the extraction is an endothermic reaction and the increase of temperature promotes the extraction of palladium
into molten paraffin wax and the extraction of palladium with PMBP is entropy controlled at high temperatures.
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An effective spectrophotometric determination of palladium with 1-(2-pyridylazo)-2-naphthol (PAN) using molten naphthalene as a diluent has been studied. A green complex of palladium with PAN is formed at 90 degrees C. In the range of pH 1.5-7.5, the complex is quantitatively extracted into molten naphthalene. The organic phase is anhydrously dissolved in CHCl(3) to be determined spectrophotometrically at 678 nm against the reagent blank. Beer's law is obeyed over the concentration range of 0.5-10 ppm. The molar absorptivity and Sandell's sensitivity are 1.2 x 10(4) l mol(-1) cm(-1) and 0.0070 mg cm(-2), respectively. The optimum conditions for determination are obtained. The interferences of various ions are observed in detail. The method has been applied to the determination of palladium in synthetic samples. 相似文献
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《Analytical letters》2012,45(8):1645-1654
ABSTRACT|A highly selective, sensitive, rapid and simple atomic absorption spectrometric method has been developed for the determination of trace amounts of palladium in synthetic and real samples. Palladium can be adsorbed on naphthalene-1, 5-diphenyl-carbazone (DPCO) as adsorbent from the large volume of its aqueous solutions in the pH range 2.0 to 0. After filtration, the metal ion was desorbed with 5ml of 0.25M thiourea solution, and determined by AAS. Alternatively, palladium can be adsorbed on this adsorbent packed in a column and determined similarly. The detection limit is 0.5 μg (signal to noise ratio=2) and the linearity is maintained in concentration range of 1.5-50μg of Pd with a correlation coefficient of 0.9992. Seven replicate determinations on samples containing 2.5 and 20μg of palladium gave the relative standard deviations of 3.6% and 0.81%, respectively. Various parameters such as effect of pH, volume of aqueous phase, shaking time and interference of number of ions on the determination of Pd have been studied in detail to optimize the conditions for its estimation in various synthetic and real samples. 相似文献
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S. Dutta P. K. Mohapatra V. K. Manchanda A. K. Das 《Journal of Radioanalytical and Nuclear Chemistry》2007,274(2):245-250
The work describes a procedure of preconcentration and separation of trace amounts of Pd(II) by solid phase extraction of
the metal ion by dithiooxamide groups incorporated into a matrix of polystyrene-divinylbenzene whereas the determination of
palladium has been carried out by radiotracer technique using 109Pd (T
1/2 = 13.43 hr, E
γ = 311, 647 keV). The experiments were carried out using both batch method and column operation. Parameters such as the amount
of resin, effect of pH, equilibration rate, sorption and desorption of metal ions have been studied. The maximum sorption
capacity for palladium was found to be 0.10 mmol·g−1 at pH 6.0. The method is rapid, has a good accuracy and can be used routinely. 相似文献
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V. Vasić A. Muk V. I. Pogonin A. K. Chibisov 《Theoretical and Experimental Chemistry》1985,21(5):584-585
The kinetics of the complex-formation of the palladium ion with 1,8-dihydroxy-2-(2-pyrazolin-5-azo)naphthalene-3,6-disulfonic acid has been studied in aqueous solution (pH 0–5). It has been shown that the rate of the reaction is a maximum at pH 2.8 and falls at pH > 2.9 because of the hydrolysis of the palladium ions and at pH < 2.9 as a consequence of the protonation of the reagent molecule.Translated from Teoreticheskaya i Éksperimental'naya Khimiya, Vol. 21, No. 5, pp. 611–613, September–October, 1985. 相似文献
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催化动力学光度法测定痕量钯 总被引:16,自引:0,他引:16
在磷酸-磷酸二氢钾缓冲溶液中,以钯(Ⅱ)催化次磷酸钠还原罗丹明B褪色为指示反应,建立了痕量钯的动力学光度分析新方法。在金(Ⅱ)的存在下,检测下限达5×10^-11g/mL钯(Ⅲ),方法应用于模拟合金样和含钯分子筛中钯的测定。结果满意。 相似文献
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A rapid, sensitive and selective method has been developed for the determination of palladium with 5,6-dimethyl-1,3-indanedione-2-oxime in acetate buffer (pH 5.5). Beer's law is obeyed over the range 0.15-4.17 mug/ml palladium(II). The molar absorptivity at 370 nm is 2.98 x 10(4) 1.mole(-1).cm(-1). The method has been applied for the determination of palladium in synthetic mixtures corresponding to PtIr and Oakay alloys. An interesting feature of the system is the abnormal shape of the Job and molar-ratio plots obtained. 相似文献
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《Analytical letters》2012,45(5):876-885
A solid phase extraction and graphite furnace atomic absorption spectrometry for the determination of palladium with MCI GEL CHP 20P resin as sorbent was studied. Trace amounts of palladium was reacted with 2-ethylhexyl octyl sulfide followed by adsorption onto MCI GEL CHP 20P solid phase extraction column, and ethanol was used as eluent. The enrichment factor of this method for palladium was reached at 250. The detection limit in the original sample for palladium was found to be 0.0048 ng mL?1. The proposed method has been successfully applied to the determination of trace amounts of palladium in different samples. 相似文献