供应美国NIST临床检验材料25羟基维生素D2和D3校准溶液SRM 2972b
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Certified Values: The certified values for 25-hydroxyvitamin D3 and 25-hydroxyvitamin D2 in Table 1 are based on the analytical results determined using isotope dilution liquid chromatography with mass spectrometric detection (ID-LC-MS) and LC with absorbance detection (LC-absorbance). A NIST certified value 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 [1]. The measurand is the total amount-of-substance of each analyte, expressed with either mass fraction (ng/g) or concentration units (nmol/L), in Table 1 [2]. Metrological traceability is to the International System of Units (SI) unit of mass expressed as mass fraction in nanograms analyte per gram of solution. 美国NIST临床检验材料
The certified amount-of-substance mass fraction values and concentration values for 25-hydroxyvitamin D3 and 25-hydroxyvitamin D2 are provided in Table 1. The certified amount-of-substance concentration values listed in Table 1 apply only to aliquots removed at 16 °C to 30 °C (see “Storage” and “Use”).
认证值：表1中25羟基维生素D3和25羟基维生素D2的认证值基于同位素稀释液相色谱质谱检测法（ID-LC-MS）和LC吸光度检测法（LC吸光度）测定的分析结果。NIST认证值是指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[1]。被测物是每种分析物的物质总量，在表1[2]中用质量分数（ng/g）或浓度单位（nmol/L）表示。计量可追溯性是指国际单位制（SI）质量单位，以纳克分析物/克溶液的质量分数表示。 25羟基维生素D2和D3校准溶液SRM 2972b
25羟基维生素D3和25羟基维生素D2的物质质量分数值和浓度值的认证量见表1。表1中列出的物质浓度值的认证量仅适用于在16°C至30°C下取出的等分试样（见“储存”和“使用”）。