【摘要】 合成了一个三氮烯类试剂3,3′-二甲基-4,4-′(2-重氮氨基噻唑)联苯(DDATBP),研究了该试剂与Hg2+的显色反应,并建立了一个测定汞的光度分析新方法。在Tween-80存在下,试剂与汞在pH 11.0的Na2B4O7-NaOH缓冲溶液中迅速生成2∶1的桔红色配合物,其最大吸收波长为545nm。在最佳实验条件下,体系在545nm处的表观摩尔吸光系数为7.08×104L.mol-1.cm-1,Hg2+的浓度在0.10~2.5μg/mL范围内符合比尔定律。对30μg/25mL的Hg2+平行测定7次,算得方法的相对标准偏差(RSD)为1.8%,以3σ/k法算得方法的检出限为0.078μg/mL。该方法用于环境水样中微量汞的测定,结果满意。更多还原

【Abstract】 A new triazene reagent,3,3′-dimethyl-4,4′-（2-diazoaminothiazolyl）biphenyl（DDATBP）,DDATBP was firstly synthesized,and the conditions of the color reaction between DDATBP and Hg（Ⅱ） were studied.Based on this color reaction,a new spectrophotometric method for the determination of Hg（Ⅱ） was developed.The results showed that the nacarat complex with a molar ratio of DDATBP to Hg（Ⅱ） of 2∶1 and maximum absorption wavelength of 545nm was formed in the presence of Tween-80 and Na₂B₄O₇-NaOH buffer solution of pH 11.0.Under the optimum conditions,Beer′s law was obeyed in the concentration range of Hg（Ⅱ） over 0.10～2.5μg/mL with the molar absorptivity of 7.08×10⁴L·mol^-1·cm^-1.The relative standard deviation（RSD） for the determination of 30μg/25mL Hg（Ⅱ） was 1.8%（n=7）,and the limit of determination calculated as 3σ/k was 0.078μg/mL.The method was not sensitive,but was simple,rapid,and of wide linear range,and has been used for the determination of mercury in water with satisfactory results.更多还原