Abstract:Vapours of organic matters were determined qualitatively employed with ultraviolet-visible absorption spectroscopy. Vapours of organic matters were detected using ultraviolet-visible spectrophotometer employing polyethylene film as medium, the ultraviolet and visible absorption spectra of vegetable oil vapours of soybean oil, sunflower seed oil, peanut oil, rapeseed oil, sesame oil, cotton seed oil, tung tree seed oil, and organic compound vapours of acetone, ethyl acetate, 95% ethanol, glacial acetic acid were obtained. Experimental results showed that spectra of the vegetable oil vapour and the organic compound vapour could be obtained commendably, since ultra violet and visible spectrum of polyethylene film could be deducted by spectrograph zero setting. Different kinds of vegetable oils could been distinguished commendably in the spectra since the λmax, λmin, number of absorption peak, position, inflection point in the ultra violet and visible spectra obtained from the vapours of the vegetable oils were all inconsistent, and the vapours of organic compounds were also determined perfectly. The method had a good reproducibility, the ultraviolet and visible absorption spectra of the vapours of sunflower seed oil in 10 times determination were absolutely the same. The experimental result indicated that polyethylene film as a kind of medium could be used for qualitative analysis of ultraviolet and visible absorption spectroscopy. The method for determination of the vapours of the vegetable oils and organic compounds had the peculiarities of fast speed analysis, well reproducibility, accuracy and reliability and low cost, and so on. Ultraviolet and visible absorption spectrum of organic vapour could provide feature information of material vapour and structural information of organic compound, and provide a novel test method for identifying vapour of compound and organic matter.
[1] ZHANG Run-sheng, WANG Kua-dou, GONG Fei-jun, et al(张润生,王跨陡,龚飞君,等). Chinese Journal of Analytical Chemistry(分析化学),2012, 40(6):915. [2] SHANG Bin, DONG Hong-min, ZHU Zhi-ping, et al(尚 斌,董红敏,朱志平,等). Transactions of the Chinese Society of Agricultural Engineering(农业工程学报),2010, 26(4):259. [3] LIU Bian-xia, SHAO Li-min(刘便霞,邵利民). Chinese Journal of Analytical Chemistry(分析化学),2011, 39(4):580. [4] WANG Hui-fang(王慧芳). Instrumentation Analysis Monitoring(仪器仪表与分析监测),2013, 2: 10. [5] ZHANG Deng-yin, WANG Hai-lin, HONG Xin-hua(张登印,王海林,洪新华). Laser Journal(激光杂志),2012, 33(5):9. [6] QIU Jian, YANG Guan-ling, HE Zhen-jiang, et al(邱 健,杨冠玲,何振江,等). Chinese Journal of Scientific Instrument(仪器仪表学报),2008, 29(1):174. [7] ZENG Tian-ling, WEN Zhi-yu, WEN Zhong-quan, et al(曾甜玲,温志渝,温中泉,等). Spectroscopy and Spectral Analysis(光谱学与光谱分析),2013, 33(4):1098. [8] QIANG Lu, ZHU Jing-ying, TANG Li-ming, et al(强 璐,朱晶莹,唐黎明,等). Acta Polymerica Sinica(高分子学报),2013, 3: 414. [9] SHEN Qing-qing, ZENG Ming-yong, ZHAO Yuan-hui(沈晴晴,曾名湧,赵元晖). Chemical Journal of Chinese Universities(高等学校化学学报),2014, 35(5):965. [10] XU Rong, WU Zai-zhen, GUO Li-ping, et al(徐 容,吴再珍,郭丽萍,等). Journal of Instrumental Analysis(分析测试学报),2011, 30(3): 336.