燃烧氧化-非分散红外吸收测定水中总有机碳方法的改进

总有机碳测定的方法分为差减法和直接法。现对测定方法进行改进,将差减法和直接法测定结果结合,先将样品进行酸化初步吹扫,再使用差减法测定总有机碳。试验结果显示,无论在标准曲线、精密度试验、加标回收试验还是标准样品测定方面,改进法均优于直接法测定结果,且能较好地缩短测量时间。

Improved Method for Determination of Total Organic in Water Using Combustion Oxidation Nondispersive Infrared Absorption Method

Total organic carbon determination method is divided into subtraction and direct method, which applied respectively in water with high volatile organic matter and high inorganic matter. Direct method to determine the total organic carbon is inadequate in the following two aspects： if the total inorganic carbon content too high, it will take a long time to sweep; while if the sample contains the inorganic carbon that cannot exist under acidification or the organic carbon which may lose after a long time of sweep, it will cause the result deviation. Now the determination method was improved, and combined the subtraction with the direct method to determine the results. First, samples under acidification were swept, and then we use subtraction to determine the total organic carbon. The results showed that, no matter in aspects of standard curve, the accuracy test, labeled recovery or standard test for samples, improvement of the method is much better than the direct method and meanwhile shortened the testing time.