Salicylidene-2-amino-4-nitrophenol spectrophotometric determination of trace Cu(Ⅱ) in water with sodium dodecylbenzene sulfonate enhancing sensitivity
MO Donglan1, ZHANG Xiahong*1,2, DONG Yan1,2, LI Jinqi1
1. Department of Chemistry and Material Engineering, Longyan University, Longyan 364012, China; 2. Fujian Provincial Colleges and University Engineering Research Center of Solide Waste Resource Utilization, Longyan 364012,China
Abstract：Copper and its compounds are widely used in industry and agriculture. Copper is a kind of essential trace element for human body, but its harm to human, animals and plants cannot be underestimated in the case of excessive intake. Therefore, the monitoring of copper in the environment is very important, and it is necessary to develop a convenient and rapid method for the detection of copper ions. In the NH3-NH4Cl buffer solution at pH=8.0, the Schiff base salicylidene-2-amino-4-nitrophenol (SANP) could react with copper(Ⅱ) to form a complex with a molar ratio of 1∶1. The maximum absorption wavelength was at 350 nm. After adding the surfactant sodium dodecylbenzene sulfonate (SDBS), the complex changed from colorless to yellow, and the maximum absorption wavelength shifted to 439 nm. It was found that the mass concentration of copper(Ⅱ) in the range of 0-0.635 mg/L had a linear relationship with the absorbance. The equation of linear regression was A=0.080 4+0.079 4ρ. The linear correlation coefficient was r=0.999 83. The apparent molar absorptivity was ε=8.74×104 L·mol-1·cm-1. The limit of detection was 0.13 mg/L. The proposed method was applied to the determination of trace copper(Ⅱ) in industrial wastewater. The relative standard deviations (RSD, n=6) of determination results were between 1.6% and 2.1%, and the recoveries were between 99% and 102%. The measured values were basically consistent with those obtained by inductively coupled plasma atomic emission spectrometry (ICP-AES).
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