极谱法测定铑的铑(III)-5-Br-TAMB-CPC配合物新体系及其作用机理的探讨 |
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引用本文: | 张光,张振义.极谱法测定铑的铑(III)-5-Br-TAMB-CPC配合物新体系及其作用机理的探讨[J].化学学报,1991,49(10):993-997. |
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作者姓名: | 张光 张振义 |
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作者单位: | 陕西师范大学化学系 |
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摘 要: | 本文建立了利用Rh(III)-5-Br-TAMB-CP配合物吸附波体系测定铑的电化学分析方法。研究了该体系吸附波的性质及阳离子表面活性剂CPC在体系中的作用机理。该方法灵敏度高, 选择性好, 可用于催化剂中铑的测定。
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关 键 词: | 阳离子表面活性剂 吡啶 P 十六碳化合物 反应机理 催化剂 氯化物 溴化物 苯甲酸 P 极谱分析 三元络合物 |
A new system of determinating rhodium by polarography and studies on the mechanism |
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Abstract: | Using single-sweep oscillopolarograph, adsorptive wave of the complex of rhodium:2-(5-bromo-2-thiazolylazo)-5-dimethylaminobenzoic acid (stability constant 1.9 ?1012) can be obtained in pH 5.0 media of acetic acid-sodium acetate at -0.55 V (vs. SCE). By adding of cationic surfactant, cetylpyridinium chloride, the peak potential shifts about 50 mV toward neg. direction and the sensitivity increases 5 times. The peak height is linearly proportional to rhodium concentration in the ranges of 1.9 ?10-8 to 1.9 ?10-7 mol dm-3 and 1.9 ?10-7 to 1.6 ?10-6 mol dm-3; the limit of detection can reach 7.8 ?10-9 mol dm-3. The method has been used for the determination of rhodium in Rh-catalyst of mol. sieve, MgO and activated carbon with satisfactory results. |
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Keywords: | CATIONIC SURTACTANTS PYRIDINE P C16 COMPOUNDS REACTION MECHANISM CATALYST CHLORIDE BROMIDE BENZENECARBOXYLIC ACID P POLAROGRAPHIC ANALYSIS TERNARY COMPLEX |
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