Citation: YU Jing-Xiang, LIU Guo-Hong, REN Li-Jun, LIU Meng, HUANG Zhi-Ping, LI Jian, LI Dan-Ping, XIAO Yan-Hua. A New Portable RGB Chromaticity Sensor for Quantitative Determination of Lewisite in Water[J]. Chinese Journal of Analytical Chemistry, ;2020, 48(7): 962-968. doi: 10.19756/j.issn.0253-3820.191431 shu

A New Portable RGB Chromaticity Sensor for Quantitative Determination of Lewisite in Water

Department of Chemical Defence, Institute of NBC Defence, PLA Army, Beijing 102205, China

Received Date: 22 July 2019
Revised Date: 16 April 2020

Fund Project: This work was supported by the National Key Research and Development Program of China (No. 2017YFA0207102).

Lewisite as well as its hydrolysis products can react with cuprous ion and produce red cuprous acetylene under the alkaline condition. To overcome the issue that a change in the intensity leads to a change in all the three components based on the RGB (red, green, blue) model, the RGB chromaticity scheme derived from normalized RGB system instead of RGB scheme was utilized for the detection in this study. The type of solubilizers and reductants, the concentrations of reductants, copper chloride and sodium hydroxide, the dosage of acetic acid, the reaction temperature, and the reaction time were optimized. As a result, gelatin and hydroxylamine hydrochloride (0.32 mol/L) were respectively used as solubilizer and reductant, the concentrations of copper chloride, sodium hydroxide and 30 μL of acetic acid were 0.15 mol/L, 30% (m/m) and 36% (m/m), respectively, and the reaction was performed for 5 min at room temperature. Under the optimal conditions, the chromaticity value showed a linear correlation with Lewisite concentration in the range of 0.40-10.05 mg/L. The theoretical detection limits for R and B values were 0.389 mg/L and 0.391 mg/L, respectively, and the practical detection limit was 0.40 mg/L. The method was successfully applied to the determination of Lewisite in artificial water samples, with the recoveries of 96.9%-106.9%. The experimental results showed that the method had high selectivity, sensitivity and good repeatability.
- RGB chromaticity sensor,
- Lewisite,
- Water
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