比值-导数法同时测定污水中的苯酚和苯胺

Simultaneous Determination of Phenol and Aniline in Waste Water by Absorbance Ratio Derivative Method

根据苯酚和苯胺在紫外区均有吸收的特点 ,建立了用比值 导数法同时测定苯酚和苯胺的紫外分光光度法。该法对波谱重叠严重的苯酚和苯胺类化合物能进行有效测定 ,省去了萃取、蒸馏、显色、酸化等预处理步骤 ,具有能消除背景干扰、提高灵敏度及提高速度的优点。在优化实验条件后进行苯酚和苯胺的测定 ,它们的线性范围分别为 1 0 1～ 2 4 2 4mg·L- 1 和 1 0 1～ 2 4 2 9mg·L- 1 ,其检测限分别为 0 0 97和 0 6 85mg·L- 1 。对合成样进行分析时 ,苯酚和苯胺的相对标准偏差 (RSD)分别为 2 6 0 %和 2 16 % ,标准加入的回收率在 95 %～ 10 4 %之间 ,结果良好。对污染河水水样进行分析测定 ,并进行加标回收试验 ,平均回收率在91%～ 10

A method of simultaneous determination of phenol and aniline in waste water by absorbance ratio derivative is reported in this paper. The sample, with which the pretreatment steps such as extraction, distillation, color development, and acid addition were not needed, was directly determined by the proposed method. Several synthetic samples of phenol and aniline and some real samples of waste water were determined by the method and satisfactory results were obtained. Under the optimal experimental conditions, the linear ranges of determination are 1.01-24.24 mg·L -1 for phenol and 1.01-24.29 mg·L -1 for aniline. And the limits of detection are 0.097 mg·L -1 for phenol and 0.685 mg·L -1 for aniline. For synthetic mixtures, the relative standard derivations (RSD) are less than 2.60% for both phenol and aniline, and the recovery is in the range of 95%-104%, but for real water samples the recovery is in the range of 91%-108%. The proposed method features high sensitivity and rapid resolution.