供应美国NIST- SRM 3036可追溯标准物质砷标准溶液

供应美国NIST- SRM 3036可追溯标准物质砷标准溶液

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This Standard Reference Material (SRM) is intended for use as a primary calibration standard for the quantitative determination of the arsenic species arsenic acid (AsV). This SRM can be used for quality assurance when assigning values to in-house control materials. A unit of SRM 3036 consists of two 10 mL sealed borosilicate glass amber ampoules of an acidified aqueous solution prepared gravimetrically to contain a known mass fraction of arsenic acid. The solution contains nitric acid at a volume fraction of approximately 1 %, which is equivalent to a concentration (molarity) of approximately 0.16 mol/L.

Certified Mass Fraction Value of AsV: 0.9706 mg/g ± 0.0044 mg/g 美国NIST- SRM 3036

A NIST certified value [1] is a value for which NIST has the highest confidence in its accuracy in that all known or suspected sources of bias have been investigated or taken into account [2]. The expanded uncertainty is calculated as U = kuc, where uc is the combined uncertainty, at the level of one standard deviation, due to material variability and measurement uncertainty following the ISO/JCGM guide [3] and reference 4. Analyses for value assignment were performed by NIST using inductively coupled plasma optical emission spectrometry (ICP-OES) and instrumental neutron activation analysis (INAA). The associated uncertainty is expressed at an approximately 95 % level of confidence with a coverage factor of k = 2.002. The certified value is metrologically traceable to the derived SI unit for mass fraction, expressed as milligrams per gram.

本标准参考物质（SRM）旨在用作砷类砷酸（AsV）定量测定的主要校准标准。当为内部控制材料赋值时，此SRM可用于质量保证。SRM 3036的一个单元由两个10mL密封的硼硅酸盐玻璃琥珀安瓿组成，安瓿是用重量法制备的含有已知质量分数的砷酸的酸化水溶液。该溶液含有体积分数约为1%的硝酸，这相当于约0.16mol/L的浓度（摩尔浓度）。 可追溯标准物质砷标准溶液

AsV的认证质量分数值：0.9706 mg/g±0.0044 mg/g

NIST认证值[1]是NIST对其准确性具有最高信心的值，因为所有已知或怀疑的偏差源都已被调查或考虑[2]。根据ISO/JCGM指南[3]和参考文献4，由于材料可变性和测量不确定度，扩展不确定度计算为U=kuc，其中uc是一个标准偏差水平的组合不确定度。NIST使用电感耦合等离子体发射光谱法（ICP-OES）和仪器中子活化分析法（INAA）进行了数值分配分析。相关的不确定性以大约95%的置信水平表示，覆盖系数为k=2.002。认证值在计量学上可追溯到质量分数的衍生国际单位制，单位为毫克/克。

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