氧瓶燃烧-ICP-OES测定某有机含碘废液中总碘的研究

Determination of Total Iodine in Organic Iodine-Containing Waste Liquid by Oxygen Flask Combustion-ICP-OES

建立了氧瓶燃烧-电感耦合等离子体发射光谱法(ICP-OES)测定某有机含碘废液中总碘含量的方法。讨论了碘形态对ICP-OES测试结果的影响,采用10 mL质量分数为0.5%氢氧化钠(NaOH)溶液和0.5 mL有效氯为3%的次氯酸钠(NaClO)溶液作为氧瓶燃烧的混合吸收液,利用ICP-OES,碘的分析波长为178.215 nm,等离子体流量为12 L/min,雾化气流量为0.5 L/min,等离子体功率为1300 W,样品流量为1.5 mL/min。结果表明,碘的线性相关系数高,样品回收率为98.57%~101.56%,相对标准偏差为0.68%,说明方法准确度高,精密度好。

A method for the determination of total iodine content in organic iodine-containing waste liquid by oxygen flask combustion-inductively coupled plasma optical emission spectrometry(ICP-OES)was established.The influence of the existing form of iodine on the test results was discussed.10 mL 0.5%sodium hydroxide(NaOH)solution and 0.5 mL sodium hypochlorite(NaClO)solution with available chlorine of 3%were used as the mixed absorption liquid of oxygen flask combustion.Using ICP-OES,the analysis wavelength of iodine was 178.215 nm,the plasma flow rate was 12 L/min,the atomization gas flow rate was 0.5 L/min,the plasma power was 1300 W,and the sample flow rate was 1.5 mL/min.The results showed that the linear correlation coefficient of iodine was high,the sample recovery ranged from 98.57%to 101.56%,and the relative standard deviation was 0.68%.The result indicates that the method has high accuracy and good precision.