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目的建立硫酸铈催化分光光度法测水中碘化物含量的不确定度数学模式,探讨检测过程中的质量控制因素。方法按照适合缺碘及高碘地区的水碘检测方法(中国疾病控制预防中心国家碘缺乏病参照实验室推荐),应用一个实例量化不确定度的分量,并作详尽的分析和计算,得到扩展不确定度。结果标准系列的逐级稀释、标准曲线的拟合对不确定度的贡献较大。该水样碘化物含量报告为(3.92±0.19)μg/L,P=95%,k=2。结论硫酸铈催化分光光度法测水中碘化物含量的检测过程中严格控制标准曲线的线性范围、逐级稀释、同步实验等步骤,为实验室质量控制提供依据。
Objective To establish a mathematical model for the uncertainty determination of iodide in water with cerium sulfate catalytic spectrophotometry and to explore the quality control factors in the detection process. Methods According to the method of iodine detection suitable for iodine deficiency and high iodine region (recommended by National Iodine Deficiency Reference Laboratory of China Center for Disease Control and Prevention), an example was used to quantify the uncertainty and make detailed analysis and calculation to obtain the expansion uncertainty. Results The serial dilution of the standard series and the fitting of the standard curve contributed more to the uncertainty. The water iodide content was reported as (3.92 ± 0.19) μg / L, P = 95%, k = 2. Conclusion Cerium sulfate catalytic spectrophotometry for the determination of iodide in water testing process strictly control the linear range of the standard curve, step by step dilution, synchronous experiments and other steps to provide a basis for laboratory quality control.