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排液扩散氢测定法(简称Py法)是一种精确、可靠、简便、没有公害的扩散氢测定方法。在《排液法测定熔敷金属中扩散氢的研究》一文中对此方法进行了详细介绍,并推导出以下精确计算公式(1)和简化计算公式(2):
Drainage diffusion hydrogen assay (Py method) is a precise, reliable, simple, non-polluting hydrogen diffusion method. This method is described in detail in “Discharge method for the determination of diffusible hydrogen in deposited metals” and derives the following exact (1) and simplified (2) formulas: