纸浆.卡伯(KAPPA)值的测定

[中文适用范围]： 本标准规定了纸浆卡伯值的测定方法。 卡伯值是木素含量或纸浆漂白性的指标。 本标准适用于卡伯值在1至100范围内的各种化学纸浆和半化学纸浆。 对于卡伯值超过100的纸浆，采用耗氯量程序（ISO 3260）描述脱木素程度。 为了达到最大的精度和准确度，必须调整样品量，使高锰酸盐的消耗量降至添加量的 20% 至 60% 之间。 注：卡伯值和纸浆木质素含量之间不存在一般且明确的关系。 该关系根据木材种类和脱木素程序而变化。 所有被KMnO4氧化的化合物，不仅是木质素，都会增加KMnO4的消耗，从而增加Kappa值。 [8]如果要使用卡伯值来得出纸浆木质素含量指数，则必须为每种纸浆类型开发特定的关系。 [外文原描述]： ISO 302:2015 specifies a method for the determination of the Kappa number of pulp. The Kappa number is an indication of the lignin content or bleachability of pulp. ISO 302:2015 is applicable to all kinds of chemical pulps and semi-chemical pulps within the Kappa number range 1 to 100. For pulps with a Kappa number exceeding 100, use the chlorine-consumption procedure (ISO 3260) to describe the degree of delignification. To achieve the greatest precision and accuracy, the sample size has to be adjusted so that the consumption of permanganate falls between 20 % and 60 % of the amount added. NOTE There is no general and unambiguous relationship between the Kappa number and the lignin content of pulp. The relationship varies according to the wood species and delignification procedure. All compounds oxidized by KMnO4, not only lignin, will increase the consumption of KMnO4, and thereby increase the Kappa number.[8] If the Kappa number is to be used to derive an index of pulp lignin content, specific relationships will have to be developed for each pulp type.