电感耦合等离子体发射光谱法测定碘的研究

Study on the Determination of Iodien by Inductively Coupled Plasma Atomic Emission Spectrometry

建立了用ICP AES测定碘的新方法 ,采用PHD氢化物发生器将亚硝酸钠和样品溶液分两路送入雾化器 ,使碘离子氧化为挥发性的碘单质而提高碘的传输效率。解决了过去碘的发射信号随放置时间的增加而变小的问题。同时发现采用亚硝酸钠作氧化剂在低酸度下可消除氯离子的干扰 ,方法的检出限为 14ng·mL-1,精密度为 1 2 % (c=2 μg·mL-1,n =10 )回收率为 99 44 % ,本方法已用于食盐和海水中碘的测定 。

A new method for determining iodine had been developed in ICP-AES. An oxidant, NaNO2 and a sample containing iodine ion were mixed in the PHD hydroide generation device, the producing iodine molecules were nebulized in nebulizer and then the iodine gas came into troch directly. The problem that the intensity of iodine decreases with the increase of time was solved. It was found that NaNO2 decreased the effect of Cl- in the low acidity. A detection limit of 14 ng.mL(-1) was obtained and the RSD of the measurement for 2 mug.mL(-1) of iodine was 1.2% (n = 10). The average recoveries of iodine were 99.44%. The method was applied to the determination of salt and seawater.