分光光度法测定水中苯胺类污染物的研究.PDF

苏州科技学院天平学院本科毕业生论文 分光光度法测定水中的苯胺类污染物的研究 摘 要 采用控制变量法对分光光度法测定水中的苯胺类污染物的标准方法进行研究。苯 胺类化合物在酸性条件下(PH l.5 -2.0) 与亚硝酸盐重氮化，再与 N-(1-萘基) 乙二胺盐 酸盐偶合，生成紫红色染料。通过实验，我们得出了结论。用 50mg 的硫酸氢钾调节 PH 值，在波长 545nm 处用 10mm 的比色皿 30min 后测定吸光度。实验中加入 1ml 的显色剂为最佳。我们还对苏州科技学院内各个地段的河水进行了测定。结果表明其 中不含有苯胺类污染物。在取得的样品中添加苯胺类污染物后，测得的加标回收率为 89%，水样测得的变异系数为 0.0307，测得的最低检测限为 0.0315µg/ml 。可知该方 法的测得的数据准确度很好。该分析法灵敏度高、重现性好，操作简便快捷，测定条 件容易选择和控制。 关键字 苏州科技学院； 苯胺； 吸光度 I 苏州科技学院天平学院本科毕业生论文 Spectrophotometry the aniline pollutants in water Abstract The method of variable control of spectrophotometric method for determination of the water of the pollutants aniline standard method. Aniline compounds in acid conditions (pH l.5-2.0) and nitrite diazo, again with N-(1-naphthalene base) ethylenediamine hydrochloride, generating purple dyes coupling. Through the experiment, we draw a conclusion. With 50 mg of potassium hydrogen sulfate adjust ph value, in 545 nm wavelength with 10 mm in the 30 min later than color dish determination spectrophotometry. Experiments with 1 ml of chromogenic is the best. We also of suzhou university of science and technology in individual section of the river was determined. The results show that which does not contain aniline pollutants. In the sample has added aniline pollutants, the measurement of prevented.the recovery is 89%, and water samples of measured the coefficient of variation was 0.0307, the measurement of minimum detection limit of 0.0315 µ g/ml. The method that the measured data accuracy is very good. This analysis high sensitivit