Study on Optical Path Optimization for Direct Determination of
Spectrophotometry of High Concentration Hexavalent Chromium
Solution by Ultraviolet Visible Spectroscopy
ZHANG Rong1, 2, DUAN Ning1, 3, JIANG Lin-hua1, 3*, XU Fu-yuan3, JIN Wei3, LI Jian-hui1
1. Research Center for Cleaner Production and Circular Economy, Chinese Research Academy of Environmental Sciences, Beijing 100012, China
2. Water Science Research Institute, Beijing Normal University, Beijing 100875, China
3. School of Environmental Science and Engineering, Tongji University, Shanghai 200092, China
Abstract：Cr(Ⅵ) has severe toxicity and mobility in the environment, especially for high-concentration Cr(Ⅵ) in the industrial process. It is important to developing an accurate and practical method for its determination. This study described a new direct spectrophotometry for determining Cr(Ⅵ) solution based on optical path optimization. The method focused on the high-concentration and determination sensitivity of the Cr(Ⅵ) solution under different optical paths. The results showed that the linear determination concentration of Cr(Ⅵ) solution increased to 1 500 mg·L-1 by changing the optical paths (1, 5, 10, 30, 50, 100 mm), and the determination sensitivity increased by 100.3 times (from 0.001 6 to 0.161 5 L·mg-1) linearly from 1 to 100 mm. Based on the highest sensitivity, the optical path optimization method was studied on the premise of ensuring accuracy. Different concentrations have the highest sensitivity under different optical path measurement conditions. In addition, the results showed that under the condition of coexistence of Cr(Ⅵ) with trivalent Cr(Ⅲ), Fe(Ⅲ), Cu(Ⅱ) and Ni(Ⅱ) in a certain proportion, the method had good anti-ion interference performance, and the accuracy of the determination results was hardly affected by the change of temperature (5~30 ℃). The method was also successfully applied to analyse high-concentration Cr(Ⅵ) in practical electroplating wastewater samples. Moreover, compared with other common Cr(Ⅵ) determination methods, this method showed a wider Cr(Ⅵ) concentration linear range (0.003 96～1 500 mg·L-1), higher analytical accuracy of high-concentration Cr(Ⅵ) solutions, and rapid determination time (1.5 min). Therefore, this method had good application prospects in the industrial process for environmental analysis and monitoring of the Cr(Ⅵ) solution.
Key words：Chromium(Ⅵ); Direct spectrophotometry; Optical path optimization; High-concentration; High sensitivity
张 榕，段 宁，降林华，徐夫元，金 伟，李建辉. 紫外可见分光光度法直接测定高浓度六价铬溶液的光程优化研究[J]. 光谱学与光谱分析, 2023, 43(06): 1829-1837.
ZHANG Rong, DUAN Ning, JIANG Lin-hua, XU Fu-yuan, JIN Wei, LI Jian-hui. Study on Optical Path Optimization for Direct Determination of
Spectrophotometry of High Concentration Hexavalent Chromium
Solution by Ultraviolet Visible Spectroscopy. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2023, 43(06): 1829-1837.
[1] Jia J L, Yao C J, Chen J F, et al. Chemosphere, 2020, 260：127546.
[2] Chauhan D, Jaiswal M, Sankararamakrishnan N. Carbohydrate Polymers, 2012, 88：670.
[3] Perotti R, Paisio C E, Agostini E, et al. Environmental Scienceand Pollution Research, 2020, 27：9465.
[4] Ma Y X, Chen Y L, Liu J J, et al. Talanta, 2018, 185：249.
[5] Levitskaia T G, O’Hara M J, Sinkov S I, et al. Applied Spectroscopy, 2008, 62：107.
[6] Jin W, Zhang Z Y, Wu G S, et al. RSC Advances, 2014, 4：27843.
[7] Hwang J D, Wang W J. Applied Spectroscopy, 1994, 48：1111.
[8] Mehmood R, Imran U, Ullah A, et al. Environmental Scienceand Pollution Research, 2020, 27：24162.
[9] Jamroz E, Kocot K, Zawisza B, et al. Microchemical Journal, 2019, 149：104060.
[10] Jin W, Wu G S, Chen A C. Analyst, 2013, 139：235.
[11] Zhang X, Koropchak J A. Microchemical Journal, 1999, 62：192.
[12] Chang I S, Kim B H. Chemosphere, 2007, 68：218.
[13] Kumar R, Bishnoi N R, Garima, et al. Chemical Engineering Journal, 2008, 135：202.
[14] Duan N, Jiang L H, Xu F Y, et al. Engineering, 2018, 4：392.
[15] Sun Z, Liang P. Microchimca Acta, 2008, 162：121.
[16] Zhu X Y, Deng Y, Li P C, et al. Microchemical Journal, 2018, 145：1135.
[17] Frois S R, Grassi M T, Campos M S, et al. Analytical Methods, 2012, 4：4389.
[18] Sereshti H, Farahani M V, Baghdadi M. Talanta, 2016, 146：662.
[19] YANG Wen-wu, ZHANG Jun(杨文武，张 钧). Environmental Engineering(环境工程)，2010，28(3)：108.
[20] XI Dan-li, SUN Yu-sheng(奚旦立，孙玉胜). Environmental Monitoring(环境监测), 4th ed.(第4版). Beijing: Higher Education Press(北京：高等教育出版社), 2010. 89.
[21] Mrkua M. Water Research, 1983, 17：231.
[22] Pai S C, Gong G C, Liu K K. Marine Chemistry, 1993, 41：343.
[23] Drolc A Vrtosěk J. Bioresource Technology, 2010, 101：4228.
[24] Buerge I J, Hug S J. Environmental Science Technology, 1997, 31：1426.
[25] Christine M, Salaün F, Salaün P. Central European Journal of Chemistry, 2007, 5：1084.
[26] Kim D, Om J. Universal Journal of Engineering Science, 2013, 1：1.
[27] Arnaud S H, Annette H. Comptes Rendus Chimie, 2018, 21：890.
[28] Lay P A, Levina A. Coordination Chemistry of Chromium, 2014. 1.
[29] Arosio P, Jaquet B, Wu H, et al. Morbidelli, Biophysical Chemistry, 2012, 168：19.
[30] KE Yi-kan, DONG Hui-ru(柯以侃，董慧茹). Handbook of Analytical Chemistry(分析化学手册). 3rd ed.(第3版) Beijing: Chemical Industry Press(北京：化学工业出版社), 2016. 9.
[31] Lu S, Li Z X, Fu X Y, et al. Dyes and Pigments, 2021, 187：109126.
[32] Lin Q, Chen P, Liu J, et al. Dyes and Pigments, 2013, 98：100.
[33] Kafle B P. Chemical Analysis and Material Characterization by Spectrophotometry, Chapter 2-Theory and Instrumentation of Absorption Spectroscopy: UV-Vis Spectrophotometry and Colorimetry. 2020, 17.
[34] Foreman W T, Williams T L, Furlong E T, et al. Talanta, 2021, 228: 122139.
[35] Park D, Yun Y S, Jo J H, et al. Industrial and Engineering Chemistry Research, 2006, 45: 5059.
[36] Sarai V P, Carlos B D, Ivonne L H, et al. Industrial and Engineering Chemistry Research, 2012, 51: 5905.
[37] Ye Z X, Yin X B, Chen L F, et al. Journal of Cleaner and Production, 2019, 236：117631.
[38] Hosseinkhani A, Rad B F, Baghdadi M. J. Environmental Manage, 2020, 274：111153.
[39] Dai L B, Cui L, Zhou D L, et al. Journal of the Taiwan Institute of Chemical Engineers, 2015, 54：170.
[40] Ya V, Li C W. Journal of the Taiwan Institute of Chemical Engineers, 2018, 87：91.
[41] Liu C, Fiol N, Poch J, et al. Journal of Water Process Engineering, 2016, 11：143.
[42] Sun Y, Xu Z Z, Zhang F F, et al. Talanta, 2022, 237：122964.
