Bookkeeper, the most widely used deacidification process based on MgO particles, was systematically evaluated on two sets of nonvaluable historical paper samples. Established analytical methods, such as pH and alkaline reserve determination, were used, as well as SEM EDS analyses to evaluate the distribution of Mg-rich particles on the paper surface and in the cross-section of the paper. The degradation rate constants of untreated and deacidified paper samples after accelerated thermal degradation were calculated based on weight average molecular mass determination to evaluate the lifetime extension of paper. The efficiency factors determined after accelerated thermal degradation of untreated and treated paper showed that paper lifetime prolongation after Bookkeeper deacidification treatment is highly limited for most of the investigated paper samples. No correlation was found between the alkaline reserve content or the pH and the degradation rate constants of the deacidified paper samples, but the paper degradation rate correlated with the paper samples pH before deacidification treatment. SEM EDS analysis showed that Mg-rich particles remained on the paper surface, which explains the limited effectiveness of the treatment.

Graphical abstract

中文翻译：

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基于历史书卷的簿记大批量脱酸评价

Bookkeeper 是使用最广泛的基于 MgO 颗粒的脱酸工艺，对两组无价值的历史纸样进行了系统评估。使用已建立的分析方法，如 pH 值和碱储备测定，以及 SEM EDS 分析来评估富镁颗粒在纸张表面和纸张横截面上的分布。基于重均分子量测定计算未处理和脱酸纸样品在加速热降解后的降解速率常数，以评估纸的寿命延长。在未经处理和处理过的纸张加速热降解后确定的效率因子表明，对于大多数研究的纸张样品，Bookkeeper 脱酸处理后的纸张寿命延长非常有限。脱酸后的纸样的碱储备含量或pH与降解速率常数之间没有相关性，但纸样的降解率与脱酸处理前的纸样pH相关。SEM EDS 分析表明，富镁颗粒残留在纸张表面，这解释了处理效果有限。但纸张降解率与脱酸处理前的纸样 pH 值相关。SEM EDS 分析表明，富镁颗粒残留在纸张表面，这解释了处理效果有限。但纸张降解率与脱酸处理前的纸样 pH 值相关。SEM EDS 分析表明，富镁颗粒残留在纸张表面，这解释了处理效果有限。

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