湿法氧化—非分散红外吸收法测定海水中总有机碳的研究

为降低氯离子对高盐度海水中总有机碳测定结果的干扰,采用湿法氧化—非分散红外吸收法测定海水中总有机碳。通过优化反应条件、绘制校准曲线、精密度实验、正确度实验等来验证该方法的可行性,并对实际样品进行测定。结果表明:该方法校准曲线相关系数为0.999 5,相对标准偏差为1.1%~6.0%,加标回收率为94.0%~98.8%,适用于海水中总有机碳的测定。

In order to reduce the interference of chloride ion on the determination of total organic carbon in high salinity seawater,the wet oxidation-non-dispersive infrared absorption method was used to determine the total organic carbon in seawater.The feasibility of the method was verified by optimizing the reaction conditions,drawing the calibration curve,precision test,accuracy test and other tests,and the actual samples were determined.The results show that the correlation coefficient of the calibration curve is 0.9995,the relative standard deviation is 1.1%-6.0%,and the spiked recovery rate is 94.0%-98.8%,which is suitable for the determination of total organic carbon in seawater.