对于某些研究工作和仲裁工作，可以从美国标准局获得经过分析的一级标准物。
For some research purposes and possibly for referee work, analyzed primary standards may be obtained from the U. s. Bureau of standards.
并随同试样分析了美国标准局1577-小牛肝标准物，由标准物的测定值与其真值的偏离即能反映试样测定值与真值的差离程度。
The standard material of calf's liver(NBS-1577) is analysed by above procedures too and the analytical results were compared with reference values of the standard material.
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