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目的通过研究电感耦合等离子体质谱(ICP-MS)测定水碘过程中的条件,为水碘的测定提供一种简单快速且结果准确的方法。方法用ICP-MS测定水中碘含量,通过优化仪器测定条件,在线内标元素(Tb)进行基体校正,标准曲线法定量,直接取样对样品测定。结果在适宜的测定条件下,方法检出限为0.2μg/L,线性范围为0μg/L~200μg/L,线性回归方程为y=3 480.9x+1 639.3,相关系数为0.999 8,相对标准偏差(RSD)为3.2%~4.7%,回收率在95.0%~103.0%,测定结果与硫酸铈催化分光光度法测定结果具有良好的一致性。结论方法样品用量少,操作简单快速,无需复杂前处理,检出限低,灵敏度高,精密度高,准确度好,抗干扰能力强,线性范围宽,适用于大批量水碘的测定。
OBJECTIVE: To determine the conditions of water Iodine by inductively coupled plasma mass spectrometry (ICP-MS), and to provide a simple, rapid and accurate method for the determination of water iodine. Methods The content of iodine in water was determined by ICP-MS. The matrix was calibrated with internal standard element (Tb) by optimizing the instrument conditions. The standard curve method was used for quantification. The sample was directly sampled for determination. Results Under the suitable conditions, the detection limit was 0.2μg / L, the linear range was 0μg / L ~ 200μg / L, the linear regression equation was y = 3 480.9x + 1639.3, the correlation coefficient was 0.999 8, The deviations (RSDs) ranged from 3.2% to 4.7%, and the recoveries ranged from 95.0% to 103.0%. The measured results were in good agreement with the results of the catalytic spectrophotometric determination of cerium sulfate. Conclusion The method has the advantages of less dosage, simple and quick operation, low detection limit, high sensitivity, high precision, good accuracy, strong anti-interference ability and wide linear range. It is suitable for the determination of large quantities of water iodine.