Sharif Mehwish, Batool Madeeha, Chand Sohail, Farooqi Zahoor Hussain, Tirmazi Syed Azhar Ali Shah, Athar Makshoof
Institute of Chemistry, University of the Punjab, Lahore, Pakistan.
College of Statistical and Actuarial Sciences, University of the Punjab, Lahore, Pakistan.
Int J Anal Chem. 2019 Jan 6;2019:5980967. doi: 10.1155/2019/5980967. eCollection 2019.
Examination and comparison of fountain pen inks are very important in forensic questioned documents examination in developing countries where the chances of fraud are greater in cases of cheques, marriage papers, entry of birth and death, etc. In this study, fountain pen inks of blue, black, green, and red colours that are commercially used in Pakistan have been discriminated by UV-Vis spectroscopy, TLC, and FTIR spectroscopy. We have calculated and compared the results in terms of discriminating power. UV/Visible Spectroscopy of fountain pen inks of different brands showed different composition despite their similar colours. TLC was effectively used to differentiate between the colored components of inks. FTIR results showed that each brand could be distinguished by studying the pattern of their absorption spectra that appeared due to the presence of different functional groups. On the basis of combined results of UV-VIS, TLC, and FTIR, the DP was found from 0.73-0.8 for blue, 0.80-1.0 for black, 0.5-1.0 for green, and 1.0 for red colored fountain pen inks. Overall, this study demonstrated the elevated worth of analysis of fountain pen inks commercially used in Pakistan as the study for fountain pen inks, while not very common, remains an interesting target study.
在支票、结婚证书、出生和死亡登记等案件中欺诈可能性较大的发展中国家，钢笔墨水的检验和比较在法医文件检验中非常重要。在本研究中，利用紫外可见光谱法、薄层色谱法和傅里叶变换红外光谱法对巴基斯坦商业使用的蓝色、黑色、绿色和红色钢笔墨水进行了鉴别。我们根据鉴别能力计算并比较了结果。不同品牌的钢笔墨水，尽管颜色相似，但紫外可见光谱显示出不同的成分。薄层色谱法有效地用于区分墨水中的有色成分。傅里叶变换红外光谱结果表明，通过研究由于不同官能团的存在而出现的吸收光谱模式，可以区分每个品牌。根据紫外可见光谱法、薄层色谱法和傅里叶变换红外光谱法的综合结果，发现蓝色钢笔墨水的鉴别能力为0.73 - 0.8，黑色为0.80 - 1.0，绿色为0.5 - 1.0，红色为1.0。总体而言，本研究证明了对巴基斯坦商业使用的钢笔墨水进行分析具有很高的价值，因为对钢笔墨水的研究虽然不太常见，但仍然是一个有趣的目标研究。
