【摘要】 合成了新试剂对磺基苯亚甲基硫代若丹宁(SBDTR),并用红外光谱、核磁共振氢谱和元素分析鉴定其结构。试验表明:在pH 3.5的HOAc-NaOAc缓冲介质中,吐温-80存在下,SBDTR与汞反应生成2∶1稳定络合物,该络合物可被Waters Sep-Pak C18固相萃取小柱固相萃取,用乙醇洗脱后在乙醇介质中,在此络合物的吸收峰550 nm波长处测定其吸光度。体系的摩尔吸光率为8.42×104L.mol-1.cm-1。汞的质量浓度在0.1~4.0 mg.L-1范围内符合比耳定律,应用于河水及食品试样中汞的测定,所得结果与原子吸收光谱法的测定结果相符。更多还原

【Abstract】 A new chromogenic reagent,namely psulfobenzylidene thiorhodanine（abbreviated as SBDTR） was synthesized and its molecular structure verified by elemental analysis,IR spectrometry and 1HNMR.It was found that in an acetate buffer medium of pH 3.5 and in the presence of Tween-80,a stable complex was formed between SBDTR and Hg（Ⅱ） in the mole ratio of 2 to 1.The complex formed was extracted on the Waters Sep-Pak C₁8 solid-phase extraction（SPE） mini-column and eluted with a definite amount of ethanol.The eluate was collected in a microabsorption cell and its absorbance measured at its absorption maxima 550 nm.Beer′s law was held in the range of 0.1-4.0 mg of Hg（Ⅱ） per liter of solution.Molar absorptivity of the reaction system was found to be 8.42×104L·mol-1·cm-1.Several samples of river water and foodstuff were analyzed by the proposed method,giving results in comformity with the results obtained by AAS.更多还原