Abstract：The ionic liquid (1 butyl 3 methylimidazolium hexafluorophosphate, ［Bmim］PF6) was mixed with ethyl acetate in the same volume and used as flotation agent. A new determination method of trace Cu in environmental water samples by spectrophotometry after ionic liquid solvent sublation was established using tetracycline (TC) as trapping agent. The effect of pH, the composition of complex, the flow rate of gas, the flotation time and the interference ions was investigated to obtain the optimal reaction conditions. In the solution at pH 58, when the flow rate of gas was 50 mL/min and the flotation time was 50 min, the enrichment factor (α)of Cu was up to 98 (500 mL of original sample solution / 5 mL of testing solution). The apparent molar absorptivity ε373was 2.54×105 L·mol-1·cm-1, the linear range was 0.08~0.56 mg/L, and the detection limit was 0.3 μg/LThis method was applied to the determination of Cu in environmental water samples, and the relative standard deviation (RSD) was smaller than 4.5 %The determination results were basically consistent with those obtained by atomic absorption spectrometryThis method was applicable for the analysis of trace / super trace Cu in environmental water samples.
马春宏;朱红;姜大雨;王庆伟;王良;闫永胜. 离子液体溶剂浮选-光度法测定环境水样中痕量铜[J]. 冶金分析, 2011, 31(1): 74-77.
MA Chun hong;ZHU Hong;JIANG Da yu;et al.. Determination of trace copper in environmental water samples by spectrophotometry after solvent flotation with ionic liquid. , 2011, 31(1): 74-77.
