供应美国NIST可追溯葡萄糖酸镁标准物质SRM 929a
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This Standard Reference Material (SRM) is certified for use as an assay standard for magnesium. It is intended primarily for use in the calibration and standardization of procedures employed in magnesium analysis and for the routine critical evaluation of daily working standards used in these procedures.
The material is magnesium gluconate dihydrate: Mg (C6H11O7)2 2H2O and is supplied in a unit of 5 g. 美国NIST可追溯
Certified Magnesium Mass Fraction: The magnesium concentration, expressed as a mass fraction percent on a dry-mass basis (see “Drying Instructions”), is based on measurements using isotope dilution inductively coupled plasma mass spectrometry (ID-ICP-MS) [1].
Certified Magnesium Mass Fraction: 5.362 % 0.027 %
The uncertainty in the certified value is calculated as U = kuc, where uc is the combined standard uncertainty calculated according to the ISO/JCGM and NIST Guides [2] and k is the coverage factor. The value of uc is intended to represent, at the level of one standard deviation, the combined effect of uncertainty components associated with the measurement uncertainty and additional Type B uncertainties. The coverage factor is 2. The expanded uncertainty, U = kuc, is defined as an interval estimated to have a level of confidence of 95 %. The measurand is the total mass fraction of magnesium. The certified value is metrological traceable to the SI units of mass, expressed as percent.
本标准参考物质（SRM）经认证可作为镁的含量测定标准。它主要用于镁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。
材料为葡萄糖酸镁二水合物：Mg（C6H11O7）2•2H2O，以5g为单位供应。 葡萄糖酸镁标准物质
认证镁质量分数：镁浓度，以干燥质量为基础的质量分数百分比表示（见“干燥说明”），基于同位素稀释的测量 电感耦合等离子体 质谱法（ID-ICP-MS）[1]。
认证镁质量分数：5.362% 0.027%
认证值的不确定度计算为U=kuc，其中uc是根据ISO/JCGM和NIST指南[2]计算的组合标准不确定度，k是覆盖系数。uc的值旨在表示在一个标准偏差的水平上，与测量不确定度和其他B类不确定度相关的不确定度分量的综合影响。覆盖系数为2。扩展不确定度U=kuc被定义为置信水平估计为95%的区间。被测物是镁的总质量分数。认证值在计量上可追溯到国际单位制的质量单位，以百分比表示。
SRM 929a – Magnesium Gluconate
产品名称 Description: Magnesium Gluconate/葡萄糖酸镁标准物质
产品批号 Lot: N/A
产品有效期 Expiration Date: 9/1/2025
产品包装 Unit of Issue: 5 g
销售状态 Status: Now Selling
COA日期 Certificate Date: 1/6/2016
运输条件 Perishable: No
是否危险品 Hazardous Material: No
运输方式 Material Hazard Class: Not Hazardous to Ship