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目的建立一种能确保仲裁法测定碘盐碘含量准确性的质控方法。方法通过控制NaClO浓度范围,利用N,N-二乙基对苯二胺(DPD)控制样品溶液中的NaClO残留,并测定质控样碘含量,来对碘盐碘含量测定结果进行质控。结果应用改进后的质控方法能有效控制NaClO浓度在0.35%~2.48%之间;利用DPD能有效控制样品溶液中NaClO的最大残留量为2×10~(-9) mol/L;既能对碘盐碘含量测定结果进行有效的质控,又能准确地判定引起测定值异常的原因。结论该方法既方便、快捷和实用,又能保证碘盐碘含量测定结果的准确性,是一种行之有效的质控方法。
Objective To establish a quality control method that can ensure the accuracy of the determination of iodine salt iodine content by the arbitration law. Methods The iodine salt iodine content was controlled by controlling the concentration range of NaClO, controlling the residual of NaClO in sample solution by using N, N-diethyl-p-phenylenediamine (DPD) and determining the iodine content of iodine salt. Results The improved quality control method can effectively control NaClO concentration between 0.35% and 2.48%. Using DPD can effectively control the maximum residual amount of NaClO in the sample solution to be 2 × 10 -9 mol / L, Iodine salt iodine determination of the results of effective quality control, but also accurately determine the cause of the measured value anomalies. Conclusion The method is convenient, rapid and practical, but also can guarantee the accuracy of iodine salt iodine determination results, which is an effective quality control method.