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痕量酚的测定比较困难,但是在水质监测方面是重要的。通常使用的方法有溴化法、比色法和气相色谱法。推荐的方法是比色法,由于除去干扰需要蒸馏而感到费时。溴化法是传统的滴定方法,但是酚的浓度不得<10mg/L。本文的方法是根据酚溴化形成三溴酚,过量的溴与碘化物反应,形成的碘萃取到环己烷中,再还原成碘化物,在硫酸溶液中与镉反应生成H_2CdI_4络合物,将络合物萃取到MIBK中,萃取液吸到空气—乙炔火焰中分析镉。本文报导的方法灵敏度高,并且能够用于水中痕量酚的分析。
Determination of traces of phenol is more difficult, but in the monitoring of water quality is important. Commonly used methods are bromination, colorimetric and gas chromatography. The recommended method is colorimetry, which is time consuming due to the distilling required to remove the interference. Bromination is a traditional titration method, but the concentration of phenol must not <10mg / L. The method of this paper is based on bromination of phenol to form tribromophenol. The excess bromine reacts with iodide, and the formed iodine is extracted into cyclohexane and then reduced to iodide. H_2CdI_4 complex is formed by reaction with cadmium in sulfuric acid solution, The complex was extracted into MIBK and the extract was drawn into an air-acetylene flame to analyze cadmium. The method reported here is highly sensitive and can be used for the analysis of trace phenols in water.