一种基于Fe-化学传感器为基础评判鞣酸铁墨水字迹形成时间的方法

A Method for Judging the Formation Time of Iron Gallic Ink Based on Fe-Chemosensor

为探索利用化学传感器对鞣酸铁墨水字迹色痕形成时间的精确分析,构建了以Fe-化学传感器为基础判定鞣酸铁墨水字迹色痕形成时间的识别模型,即采用邻菲啰啉识别Fe^(2+)的质量浓度和磺基水杨酸识别Fe^(3+)的质量浓度。研究结果表明,在1年之内,鞣酸铁墨水字迹色痕提取液中,Fe^(2+)的质量浓度随着时间的推移呈现逐渐减少的趋势,鞣酸铁墨水字迹色痕提取液中,Fe^(3+)的质量浓度随着时间的推移呈现逐渐升高的趋势;超过1年之后,提取液中Fe^(2+)、Fe^(3+)质量浓度都呈现减少的趋势,这种变化规律归属于被空气中氧气的氧化和载体中纸张的吸附作用力引起的变化规律。该方法可成功地检测不同年代的样本中鞣酸铁墨水字迹色痕的形成时间,通过与同期样品进行双重比对检验的方式判断鞣酸铁墨迹色痕的形成时间。最后,依据不同年代的样本测试数据,拟合出鞣酸铁墨水中Fe^(2+)、Fe^(3+)与时间的变化规律,并在真实的样本中得到了验证。

To explore the application of a new chemosensor in accurate analyzation of the forming time of handwriting trace of iron gallic ink, we have developed a model based on a Fe-based chemosensor to determine the forming time of handwriting trace of iron tannate ink by using o-phenanthroline to identify the molality of Fe^(2+) and using sulfosalicylic acid to identify the molality of Fe^(3+). The results showed that, within one year, the molality of Fe^(2+) ion in the handwriting trace of iron gallic ink decreased, while the molality of Fe^(3+) ion increased. After a year, both the molalitys of Fe^(2+) and Fe^(3+) ions in the extracts decreased, which were attributed to the oxidation by oxygen in the air and the adsorption effect of the paper. Our method can successfully detecte the forming time of handwriting trace of iron gallic ink with the different age samples, and the trace forming time was judged by performing a double comparison test with the sample in the same period of time. Finally, based on the experiment data of the different age samples, we fitted the change curve of iron ions contents vs. time in the iron gallic ink, then verified it in the real samples.