供应美国NIST- SRM 3037临床检验材料标准物质三价砷标准溶液
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产品规格Unit of Issue: 2 x 10 mL
产品有效期Product Expiration Date: 30 September 2027 美国NIST- SRM 3037临床检验材料标准物质
产品储存温度NIST Storage Temperature: Ambient Please see certificate for user storage information regarding this material.
Safety Information
Table(s) of Related Materials 104.06 105.01
Hazard Class: This material is considered hazardous under DOT: Hazard Class 8, Corrosive 三价砷标准溶液
Perishable Types: Non-Perishable
This Standard Reference Material (SRM) is intended for use as a primary calibration standard for the quantitative determination of the arsenic species arsenous acid (AsIII). This SRM can be used for quality assurance when assigning values to in-house control materials. A unit of SRM 3037 consists of two 10 mL sealed borosilicate glass amber ampoules of an acidified aqueous solution prepared gravimetrically to contain a known mass fraction of arsenous acid.The solution contains hydrochloric acid at a volume fraction of approximately 1 %, which is equivalent to a concentration (molarity) of approximately 0.12 mol/L. Due to digestion of the starting material, arsenic trioxide, with sodium hydroxide, sodium is present in the ampoules at approximately 1000 mg/kg.
Certified Mass Fraction Value of AsIII: 1.0442 mg/g ± 0.0020 mg/g
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 gravimetric titrimetry. The associated uncertainty is expressed at an approximately 95 % level of confidence with a coverage factor of k = 2.086. 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）旨在用作砷类亚砷酸（AsIII）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 3037的一个单元由两个10 mL密封的硼硅酸盐玻璃琥珀安瓿组成，安瓿中的酸化水溶液通过重量法制备，含有已知质量分数的亚砷酸。该溶液含有体积分数约为1%的盐酸，相当于约0.12 mol/L的浓度（摩尔浓度）。由于原料三氧化二砷与氢氧化钠的消化作用，安瓿中的钠含量约为1000mg/kg。
AsIII的认证质量分数值：1.0442 mg/g±0.0020 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使用重量滴定法进行了价值分配分析。相关的不确定性以大约95%的置信水平表示，覆盖系数为k=2.086。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。