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| 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
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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.
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Received: 2022-03-17
Accepted: 2022-06-08
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Corresponding Authors:
JIANG Lin-hua
E-mail: jianglinhua2022@163.com
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