高浓度臭氧分析方法的探讨

Determination of High Concentration Ozone

目的探讨一种基于碱性碘化钾比色法的高浓度臭氧(O3)分析方法。方法基于碱性碘化钾比色法,从臭氧样品的稀释、稀释剂的选择以及不同的稀释度与分析结果之间的关系等方面,对O3供源所产生的高浓度臭氧分析方法进行了研究。结果高浓度O3样品与碘化钾反应及酸化后形成高碘样品,在预实验基础上,找出某一高碘的稀释样品在加淀粉后不产生悬浮物的最小稀释度;正式实验时,在略大于该稀释度的条件下,加淀粉显色,再对显色溶液进行稀释,在减少稀释倍数的前提下,尽量将此显色溶液稀释到标准色列管的第3～6管之间,测定结果准确。结论该方法能较好地分析高浓度O3供源所产生的臭氧浓度。

Objective To explore the method of high concentration ozone based on alkalinity potassium iodide colorimetric method. Methods Based on alkalinity potassium iodide colorimetric method, the analysis method of high concentration ozone from O3 generator was studied, which included dilution of ozone （O3） samples, selection of diluent, and the relationship between different extent of dilution and analysis result. Results The ozone （O3） samples with high concentration transformed into iodine （I2） samples with high concentration after reaction with potassium iodide and acidification. Then the minimum dilutability of the thinning iodine samples with high concentration not producing suspended matter after adding in amytum was found out by pre-experiment. In formal experiment, color development adding amylum into the iodine samples would be done under the condition of slightly greater than the dilutablity, and the color solution would be diluted. Under the precondition of decreasing dilution multiple, the color development solution would be diluted to the 3th-6th tubes of standard color comparison tube,which would be helpful to get accurate data. Conclusion This method is applicable to the determination of high concentration ozone.