过氧化二异丙苯含量测定方法的研究

Research for Determination Method of Dicumyl Peroxide Content

过氧化二异丙苯(DCP)是强氧化剂,用其强氧化性质将饱和碘化钾溶液中的碘离子还原为碘,在样品中加入碳酸氢钠和浓盐酸,在低温(65℃)条件下使碳酸氢钠和浓盐酸反应生成二氧化碳形成保护气体,防止碘升华与空气中的氧反应而造成测定误差,在酸性条件下以淀粉作指示剂,用硫代硫酸钠标准溶液滴定反应生成的碘,以此方法测定过氧化二异丙苯(DCP)的含量,在实际工作中可操作性较强、精密度和准确度高、方法操作简单且重现性较好、抗干扰能力强,完全能够满足容量分析方法中规定的2个平行测定结果误差不大于0.2%的要求。

Dicumyl peroxide （DCP） is a strong oxidant. Using its strong oxidizing nature, iodine ions in the saturated solution of potassium iodide can be reduced to iodine. The sodium bicarbonate and strong hydrochloric acid was added in the specimen and they can react at low temperature （65 ℃ ） to form protectionability gas of carbon dioxide so that the measuring error range caused by the reaction of iodine and oxygen in the air can be avoided. In acidic conditions the iodine formed in the reaction can be titrated with standard sodium thiosulfate solution with starch as indicator. The content of DCP can be measured by this method and it has strong operability in the actual work, high precision and accuracy, good reproducibility, and powerful anti- jamming capability. Moreover, the method is simple and it can fully satisfy the requirement of the error range of the two parallel determination results less than 0. 2%.