Direct determination of Cu by liquid cathode glow discharge-atomic emission spectrometry

作者：Lu, Quanfang^*; Yang, Shuxiu; Sun, Duixiong; Zheng, Jidong; Li, Yun; Yu, Jie^*; Su, Maogen

来源：Spectrochimica Acta Part B: Atomic Spectroscopy , 2016, 125: 136-139.

DOI：10.1016/j.sab.2016.09.019

• Liquid cathode glow discharge (LCGD)
• Atomic emission spectrometry (AES)
• Copper
• Ionic surfactant
• Water analysis

In this study, a novel liquid cathode glow discharge-atomic emission spectrometry was developed for the direct determination of Cu in aqueous solutions, in which the glow discharge plasma was produced in the solution between the needle-like Pt cathode and the electrolyte around it. The effects of discharge voltage, solution pH, and the ionic surfactant cetyltrimethylammonium chloride (CTAC) on emission intensities were investigated. The limit of detection (LOD) of Cu was compared with those measured by closed-type electrolyte cathode discharge-atomic emission spectrometry (ELCAD-AES). The results showed that the optimal operation conditions are voltage of 135 V, a pH of 1, and addition of 0.15% CTAC. CTAC can enhance the emission intensity and lower the LOD of Cu I. The net intensity of atomic emission lines of Cu I at 324.8 nm with 0.15% CTAC improved by 1.5 fold, and the LODs of the Cu at 135 V with 0.15% CTAC and without CTAC are 0.019 and 0.234 mg L-1, respectively. The analytical capability of Cu in this study is comparable to the closed-type ELCAD-AES, and it satisfied the recommended levels of Cu in the WHO standards for drinking-water quality. This technique can be effectively used for on-line monitoring of metal ions in aqueous samples.

• 出版日期2016-11-1
• 单位西北师范大学