加热卷烟含水率测定方法比选及结果修正

Comparing different methods to determine moisture contents of heated tobacco materials based on correction results

为解决加热卷烟中含水率难以快速准确测定的问题,对卡尔·费休法、气相色谱法、近红外光谱法等测定方法进行了系统的比较和优化。同时,以甘油为代表,探究了大剂量挥发性物质对测定准确性的影响。并基于此,建立了适用于不同生产工艺的加热卷烟含水率的测定方法和结果修正模型。结果表明:(1)优化测量参数后,卡尔·费休法的加标回收率为99.50%~102.70%,气相色谱法为98.64%~108.70%。(2)为提高生产过程中加热卷烟样品含水率检测的时效性,以卡尔·费休法测定结果为基准,建立了近红外光谱法测定结果的多项式修正模型,修正后的结果误差从1.75%降低至0.32%,满足实际生产过程中的品质控制要求。卡尔·费休法与近红外光谱法的组合应用,兼具准确性和时效性,且操作简便,适用于加热卷烟加工工艺全流程中的含水率测定。

To address the challenge in efficiently and accurately determining the moisture content of heated tobacco materials,accurate determination methods such as Karl Fischer,gas chromatography,and near-infrared spectroscopy were systematically compared and optimized.The mechanism of the effect of high doses of volatile substances on accuracy was investigated using glycerol as a representative.Based on this,a determination method and result correction models for the moisture content of heated tobacco material samples prepared by different production processes were established.The results showed that:1)After optimizing the determination parameters,the spiked recoveries for Karl Fischer and gas chromatography methods were in the range of 99.50%-102.70%and 98.64%-108.70%,respectively.2)To promote the efficiency of moisture content determination of heated tobacco materials during the production process,a polynomial moisture content correction model for using near-infrared spectrometry was established using the Karl Fischer method results as a baseline.The moisture content errors were reduced from 1.75%to 0.32%after the correction,which met the requirements for quality control in the actual production process.The combined Karl Fischer and near-infrared spectroscopy method is suitable for the moisture content determination in the whole process of heated tobacco material processing with both accuracy and efficiency,and easy to operate.