本文件规定了两种测定石灰材料中和值（NV）的方法。 方法A适用于除硅酸盐石灰材料以外的所有石灰材料。 注1硬石灰材料的例子有石灰石和白云石。软石灰材料的例子有白垩、泥灰和生石灰。 方法B适用于所有石灰材料。 两种方法都没有正确考虑含有超过3%P2O5的材料的潜在中和值。为了对含有超过3%P2O5的产品进行更准确的农艺评估，EN 14984[8]用于确定石灰效率。 注2 ISO 6598和ISO 7497中描述的方法可用于P2O5含量的测定。关于P分析的更多信息在参考文献[5]和[6]中给出。注3碳酸盐消耗H+并去除溶液中的酸度，随后解离为H2O和CO2。正磷酸盐的形式可以消耗H+，但不会解离成去除酸性的分子形式。用碱反滴定酸度，导致NV低估。

This document specifies two methods for the determination of the neutralizing value (NV) of liming materials. Method A is applicable to all liming materials except silicate liming materials. NOTE 1 Examples of hard liming materials are limestone and dolomite. Examples of soft liming materials are chalk, marl and burnt lime. Method B is applicable to all liming materials. Neither method correctly takes into account the potential neutralizing value of material containing more than 3 % P₂O₅. For a more accurate agronomic assessment of products containing more than 3 % P₂O₅, EN 14984^[8] is used to determine the liming efficiency. NOTE 2 The methods described in ISO 6598 and ISO 7497 can be used for the determination of P₂O₅ content. Further information on P analyses is given in References [5] and [6]. NOTE 3 Carbonate consumes H⁺ and removes acidity in solution with subsequent dissociation to H₂O and CO₂. Forms of orthophosphate can consume H⁺ but are not dissociated to molecular forms that remove acidity. The acidity is back titrated with alkali causing an underestimation of NV.