钠的火焰光度法应用于钴中低量钠的测定时,大量钴有严重干扰。采用分离手段,因空白高且不稳定,影响测定的准确度。我们发现,钴的背景幅射强度在波长560～660nm间为一恒定值,且在钠的最大幅射波长589nm处,钴与钠的幅射强度具有加和性。以测定波长为589nm,参比波长为610nm,进行背景校正,可消除钴的干扰。本法简便,获得满意结果。 Sodium flame photometry method used in the determination of low-sodium cobalt, a large number of cobalt have a serious interference. The use of separation means, because the blank high and unstable, affecting the accuracy of determination. We found that the background radiation intensity of cobalt is constant at a wavelength of 560-660 nm, and the radiation intensities of cobalt and sodium are additive at the maximum wavelength of 589 nm of sodium. To determine the wavelength of 589nm, the reference wavelength of 610nm, the background correction to eliminate the interference of cobalt. This law is simple and gives satisfactory results.