卤水中碘离子的氧化行为研究

Study on oxidation of iodine ion in nature brine

分别用0.5%(质量分数)的次氯酸钠和1.0%(质量分数)的双氧水作氧化剂,研究了卤水中的碘离子氧化为单质碘的行为,用分光光度法确定了氧化剂的最佳用量、氧化反应的适宜p H及氧化反应时间。对于碘离子质量浓度约为20 mg/L的卤水,每200 m L卤水次氯酸钠和双氧水的最佳用量分别为0.6 m L和1.7 m L,适宜的氧化反应p H分别为4.8左右和3.0左右,对应的氧化时间分别为30 min和70 min。实验还研究了两种氧化剂对碘的过氧化问题,得到了氧化过程中吸光度变化与碘过氧化的关系。

The oxidation behavior of iodide ions contained in nature brine to iodine was studied by spectrophotometric method with two different oxidants（0.5% NaClO and 1.0% H2O2, mass fraction ）.The optimal dosage of NaClO and H2O2 were determined to be 0.6 mL and 1.7 mL every 200 mL brine ,corresponding to the optimal pH of 4.8 and 3.0 ,and the optimal reaction time of 30 rain and 70 min, respectively.The excessive oxidation problems of iodine by these two oxidants were also investigated and the relationship between absorbance and excessive oxidation degree of iodine was given in this paper.