供应美国NIST临床检验材料硝酸铅标准物质SRM 928
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This Standard Reference Material (SRM) is certified for use as an assay standard for lead and is intended primarily for use in the calibration and standardization of procedures employed in analysis and for routine critical evaluation of the daily working standards used in these procedures. A unit of SRM 928 consists of 30 g of lead nitrate.
Certified Mass Fraction Lead Nitrate [Pb(NO3)2]: 100.00 % 0.03 %
Certified Values: The certified value shown is based on the determination of lead in the material as received; drying being unnecessary. Lead is precipitated as the chromate using a slight excess of potassium dichromate (SRM 136c). The lead chromate is removed by filtration and the excess chromate ion determined spectrophotometrically. Details of this method are reported elsewhere [1]. The molecular weight of lead nitrate employed in the calculation is 331.219.This value is based on a mass-spectrometrically determined value of 207.209 for the atomic weight of lead in this sample. The uncertainty shown represents two standard deviations of a single measurement based on 16 determinations with allowances for known sources of possible error. A semi-quantitative survey for trace metals by emission spectroscopy indicated the following: silver, 2 μg/g; chromium, 3 μg/g; and nickel 3 μg/g. No other metals were detected.
本标准参考物质（SRM）经认证可作为铅的测定标准，主要用于分析程序的校准和标准化，以及对这些程序中使用的日常工作标准进行常规关键评估。SRM 928的一个单元由30克硝酸铅组成。 美国NIST临床检验材料
认证质量分数硝酸铅[Pb（NO3）2]：100.00% 0.03%
认证值：所示的认证值基于对收到材料中铅的测定；干燥是不必要的。使用稍微过量的重铬酸钾（SRM 136c）将铅沉淀为铬酸盐。铬酸铅通过过滤去除，过量的铬酸盐离子通过分光光度法测定。此方法的详细信息在其他地方报告[1]。计算中使用的硝酸铅分子量为331.219。该值基于该样品中铅原子量的质谱测定值207.209。所示的不确定度表示基于16次测定的单个测量的两个标准偏差，并考虑到已知的可能误差源。通过发射光谱法对痕量金属进行的半定量调查表明：银，2μg/g；铬，3μg/g；和镍3μg/g。未检测到其他金属。 临床检验材料硝酸铅标准物质
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SRM 928 Lead Nitrate (Clinical Standard), Preprint, November 1, 1975