1.1本试验方法涵盖了确定高乙醇含量燃料酸强度测量值的程序。这些包括乙醇、变性燃料乙醇和燃料乙醇（Ed75-Ed85）。如规范D 4806和D 5798所述，试验方法适用于标称含70%或更高体积分数乙醇的燃料。 1.2本试验方法中测得的酸强度定义为pHe。醇溶液的pHe值与水溶液的pH值不可直接比较。 1.3 pHe的值在一定程度上取决于燃料混合物、搅拌速度和电极在燃料中的时间。 1.4本标准无意解决与其使用相关的所有安全问题（如有）。 本标准的用户有责任在使用前制定适当的安全和健康实践，并确定监管限制的适用性。

1.1 This test method covers a procedure to determine a measure of the acid strength of high ethanol content fuels. These include ethanol, denatured fuel ethanol, and fuel ethanol (Ed75-Ed85). The test method is applicable to fuels containing nominally 70 volume % ethanol, or higher, as described in Specifications D 4806 and D 5798. 1.2 Acid strength as measured in this test method is defined as pHe. A pHe value for alcohol solutions is not directly comparable to pH values of water solutions. 1.3 The value of pHe will depend somewhat on the fuel blend, the stirring rate, and the time the electrode is in the fuel. 1.4 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.