Dai Yi, Yu Zhen-Hua, Zhan Jian-Bo, Chai Xin-Sheng, Zhang Shu-Xin, Xie Wei-Qi, He Liang
State Key Laboratory of Pulp and Paper Engineering, South China University of Technology, Guangzhou, China.
China Tobacco Yunnan Industrial Co. Ltd., Kunming, China.
J Chromatogr A. 2017 Jul 21;1507:32-36. doi: 10.1016/j.chroma.2017.05.052. Epub 2017 May 26.
The present work reports on the development of a pressure-affected based headspace (HS) analytical technique for the determination of calcium carbonate content in paper samples. By the acidification, the carbonate in the sample was converted to CO and released into the headspace of a closed vial and then measured by gas chromatography (GC). When the amount of carbonate in the sample is significant, the pressure created by the CO affects the accuracy of the method. However, the pressure also causes a change in the O signal in the HS-GC measurement, which is a change that can be used as an indirect measure of the carbonate in the sample. The results show that the present method has a good precision (the relative standard deviation<2.32%), and good accuracy (the relative differences compared to a reference method was<5.76%). Coupled with the fact that the method is simple, rapid, and accurate, it is suitable for a variety of applications that call for the analysis of high carbonate content in paper samples.
本研究报告了一种基于压力影响的顶空（HS）分析技术的开发，用于测定纸样中的碳酸钙含量。通过酸化，样品中的碳酸盐转化为CO并释放到密闭小瓶的顶空中，然后用气相色谱（GC）进行测量。当样品中碳酸盐的含量较高时，CO产生的压力会影响该方法的准确性。然而，该压力也会导致HS-GC测量中O信号的变化，这种变化可作为样品中碳酸盐的间接测量指标。结果表明，本方法具有良好的精密度（相对标准偏差<2.32%）和良好的准确度（与参考方法相比相对差异<5.76%）。再加上该方法简单、快速且准确，适用于各种需要分析纸样中高碳酸盐含量的应用。
