耗氧量(OC)测定方法的改进及比较分析

Improvement and Comparison of Methods for Determination of Oxygen Consumed in Water

[目的]探讨简便快捷的耗氧量（OC）测定方法.[方法]将国标法（GB/T 5750-1985）的水浴加热30 min改为直火加热5 min,硫酸溶液浓度由（1＋3）改为（1＋4）,测定水样耗氧量（OC）,并与国标法进行比较分析.[结果]改进的测定方法可靠,RSD为1.75%～2.29%,配对t检验,P＞0.05,与国标法比较差异无统计学意义.[结论]改进法操作简单,易于掌握,耗时短,缩短了检验周期,提高了工作效率,适合于基层实验室推广使用.

[Objective]To develop a simple and rapid method for determination of oxygen consumed（OC）in water. [Methods]The method was improved in the base of national standard method （GB/T 5750-1985）, which involved in fire heating 5 min instead of water bath heating 30rain described in standard method, and using the concentration of sulfuric acid in water 1 ＋4 instead of 1 ＋3. The values of OC determined by two methods were compared and analyzed. [Results] The improved method was reliable,with relative standard deviation between 1.75% to 2.29%. The values determined by two methods hadno statistical difference with t-test （ P 〈0.05）. [Conclusion]The improved method was simple, rapid,reliable,and could be popularized in grass-root labs.