Environ Technol. 2014 May-Jun;35(9-12):1165-74. doi: 10.1080/09593330.2013.864337.
A kinetic catalytic method has been developed for the determination of vanadium based on its catalytic effect on the redox reaction of azorubin S and bromate in the presence of a sulphuric and nitric acid mixture. The reaction is monitored spectrophotometrically by measuring the decrease in absorbance of the reaction mixture at 515 nm. The fixed-time method was used for 0.5-5 min. Optimization of the reaction conditions regarding concentrations of acids, dye, oxidant, masking agent, etc. was investigated. The rate of decrease in absorbance of azorubin S was proportional to the concentration of vanadium in the range of 2.0-1.05 x 10(3) ng mL(-1). 3Sb/m was 0.0129 ng mL(-1) and 10 Sb/m was 0.0432 ng mL(-1). The catalytic method based on the oxidation reaction of azorubin S and bromate shows a good selectivity for vanadium over a wide variety of interference cations and anions. The proposed method was successfully applied to the determination of vanadium in groundwater samples and spiked-water samples.
已开发出一种动力学催化方法，用于测定钒，其原理是基于钒在硫酸和硝酸混合存在下对吖啶红 S 和溴酸盐之间氧化还原反应的催化作用。通过测量反应混合物在 515nm 处的吸光度下降来进行分光光度监测。使用固定时间法在 0.5-5 分钟之间进行。优化了关于酸、染料、氧化剂、掩蔽剂等浓度的反应条件。吖啶红 S 的吸光度下降速率与钒的浓度在 2.0-1.05 x 10(3)ng mL(-1)之间成正比。3Sb/m 为 0.0129ng mL(-1)，10Sb/m 为 0.0432ng mL(-1)。基于吖啶红 S 和溴酸盐氧化反应的催化方法对各种干扰阳离子和阴离子表现出对钒的良好选择性。该方法成功地应用于地下水样品和加标水样中钒的测定。
