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1范围本标准适用于各类腐植酸原料及产品p H值的测定。2规范性引用文件下列文件对于本标准的应用是必不可少的。凡是注日期的引用文件,仅所注日期的版本适用于本标准。凡是不注日期的引用文件,其最新版本(包括所有的修改单)适用于本标准。NY/T 1121.2-2006土壤检测第2部分:土壤p H的测定NY/T 1377-2007土壤p H的测定3术语和定义3.1 p H值亦称氢离子浓度指数、酸碱值,是用氢离子活度的负对数表示溶液酸碱程度的方法。3.2 p H计的斜率每变化1 p H值产生电位的变化量,通常用m V/p H或%表示。
1 Scope This standard applies to all kinds of humic acid raw materials and products Determination of p H value. 2 Normative references The following documents for the application of this standard is essential. For dated references, only the dated version applies to this standard. For undated references, the latest edition (including all amendments) applies to this standard. NY / T 1121.2-2006 soil testing Part 2: determination of soil p H NY / T 1377-2007 Determination of soil p H 3 Terms and Definitions 3.1 p H value, also known as hydrogen ion concentration index, pH, The negative logarithm of the ion activity indicates the acid-base level of the solution. 3.2 p H change in the slope of each p 1 p value produces a change in the amount of potential, usually m V / p H or%.