【摘要】 测定天然水中侵蚀性二氧化碳的含量,目前基层单位大多采用酸滴定法和计算法测定,但是它们都存在着误差较大或耗时长等问题。针对酸滴定法提出了改进措施,用电动振荡器振荡30 min后即进行测定,缩短了水样预处理时间;对总碱度较低的水样,改用甲基红-溴甲酚绿混合指示剂,消除由于滴定终点漂移所引起的误差,使得测定结果更加准确。针对计算法,分析了计算获得的含量数据存在误差的原因,提出了消除或减小误差的改进措施,重新确定滴定终点的颜色、进行双样测定和使用对照溶液等。更多还原

【Abstract】 Most establishments generally use the acid titration and calculation method to determining the content of aggressive carbon dioxide in natural water. However they all have the problem of time-consuming or not accurate enough,and some other problems. For acid titration,the improvement measures which put forward in this paper are: oscillate the water with an electric generator oscillation for 30 minutes,which shorted the time for water sample pretreatment. For total alkalinity lower water,use methyl red-bromocresol green mixed indicater,This can eliminate the error caused by the drift of titration end point,and make the determination results more accurate. As for Calculation method,analyzed the cause of the error of content data by calculation,and put forward the improvement measures to eliminate or reduce the error: Re-determine the color of the endpoint,double sample determination and use of reference solution.更多还原