【摘要】 以纯度标准物质为原料,采用离子色谱法对基体和原料的干扰因素进行了检测,在此基础上,采用重量-容量法制备了氟离子、氯离子、硝酸根离子、硫酸根离子混合溶液标准物质,进行了制备方法的研究以及均匀性和稳定性的考察,将配制值作为标准值并进行了不确定度评定。结果表明,研制混合溶液中氟离子、氯离子、硝酸根离子、硫酸根离子的质量浓度分别为50μg/m L、150μg/m L、500μg/m L、500μg/m L,相对扩展不确定度(k=2)分别为3%、1%、1.2%、1.0%。更多还原

【Abstract】 Taking purity reference material as the raw materials,the ion chromatography method was employed to detect the interference factors of the matrix and raw materials. On this basis,the mixed solution of F^-、Cl^-、NO₃^-、SO₄^2- multi-ion mixed solution reference material was developed by the gravimetric-volumetric method,with the preparation method and the uniformity and stability being investigated,and the uncertainty of the prepared value being evaluated. The result showed the mass concentration of F^-、Cl^-、NO₃^-、SO₄^2- in the mixed solution was 50μg/m L,150μg/m L,500μg/m L,and500μg/m L respectively,with the relative expanded uncertainty of 3. 0% 、1. 0% 、1. 0% 、1. 2%.更多还原