用于液体样品定量沉积的毫克质量计量
Milligram mass metrology for quantitative deposition of liquid samples
摘要：
随着样品体积的减少，按质量定量分配液体变得越来越困难。毫升的液体可以直接在分析天平上或使用比重瓶方法进行称重，而μl样品由于其毫克级质量和快速蒸发而更具挑战性。本文提出了一种定量测定1 μl液滴质量的方法。结合可追溯的校准质量和样品蒸发的校正的微毛细管比重瓶的称重允许测定液滴质量的顺序为1 mg，相对组合扩展不确定度为0.3%。
英文摘要：
Quantitative dispensing of liquids by mass becomes increasingly difficult as sample volume decreases. Whereas ml quantities of liquid can be directly weighed as dispensed on an analytical balance or using pycnometer methods, μl samples are more challenging due to their milligram-scale mass and rapid evaporation. Here, a method for quantitative determination of the mass of 1 μl droplets of liquid is proposed. The weighing of a microcapillary pycnometer combined with traceable calibration masses and corrections for sample evaporation allows determination of the droplet mass on the order of 1 mg with relative combined expanded uncertainty of 0.3 %.
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