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金属络合效应对草酸HPLC分析的影响及消除
吴雨涵, 孙贤波, 徐宏勇
(华东理工大学资源与环境工程学院)
Influence and Elimination of Complexation Effect on HPLC Analysis of Oxalic Acid
WU Yuhan, Sun Xianbo, Xu Hongyong
(East China University of Science and Technology)
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投稿时间:2017-06-14    修订日期:2017-08-18
中文摘要: 电镀废水中“金属-络合剂”带来的络合效应可能会降低高效液相色谱(HPLC)对络合剂分析的准确度。本文以镍-草酸作为模式化合物,考察了络合效应对于络合剂草酸HPLC分析的影响,发现200 mg/L的镍离子对草酸定性分析的影响较小,保留时间的变化幅度为1.0%;200 mg/L的镍离子对草酸定量分析的影响较大,峰面积的分析误差为33.7%。采用氢氧化物沉淀法来消除络合效应,使得峰面积的变化幅度降为1.7%,提高了电镀废水中草酸HPLC分析的准确度。
中文关键词: 络合效应  草酸  HPLC  破络
Abstract:The article is mainly about the complexation effect and the useful method to eliminate this effect. The discussion of the experiment result is about the high performance liquid chromatography (HPLC) analysis of nickel-oxalic acid and hydroxide precipitation pretreatment. It is known that the complexation effect is caused by metal ions and complexing agents and it will promote the formation of metal-complexing agents under the different conditions. The complexation effect brought by metal-complexing agents may reduce the analytical accuracy of complexing agents by HPLC. Since there are various kinds of metal-complexing agents in the electroplating wastewater, nickel-oxalic acid is chosen to be the typical metal-complexing agent in this paper. The research on the analysis of oxalic acid by HPLC that can be influenced by the complexation effect has been studied further. The UV-visible wavelength scanning is assisted to verify that the complexation effect has made a big impact on the HPLC analysis of oxalic acid. The HPLC analysis of oxalic acid is divided into the qualitative analysis and the quantitative analysis. The qualitative analysis is from the data of the retention time, and the quantitative analysis is mainly from the data of the peak area. When adding the nickel ions, the retention time of oxalic acid varies about 1.2%, so it can be concluded that the 200 mg/L nickel ions has less impact on the qualitative analysis of oxalic acid by HPLC. At the same time, the variation of the peak area is about 33.7%, so it is found that the influence of 200 mg/L nickel ions on the quantitative analysis of oxalic acid by HPLC is so large. At last, the pretreatment method of hydroxide precipitation is proposed to eliminate the complexation effect. The precipitation pretreatment makes the variation of the peak area reduce to 1.7%, which increases the analytical accuracy of oxalic acid by HPLC in the electroplating wastewater.
文章编号:20170614001     中图分类号:    文献标志码:
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引用本文:
吴雨涵,孙贤波,徐宏勇.金属络合效应对草酸HPLC分析的影响及消除[J].华东理工大学学报(自然科学版),DOI:10.14135/j.cnki.1006-3080.20170614001.

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