Determination of thallium in wastewater by resonance light scattering method with Rhodamine 6G
DENG Xiang-zhou1, WU Ying-juan2 , GENG Xin-hua1, WANG Yi1ZHANG Hong-guo2
1. College of Chemistry and Chemical Engineering, Guangzhou University, Guangzhou 510006 , China;#br#
2. College of Environmental Science and Engineering, Guangzhou University, Guangzhou 510006 , China
Abstract：In sulfur acid, trace thallium reacted with potassium iodide and generated I3- to form complex (1∶1) with Rhodamine 6G, resulting in significant enhancement of resonance light scattering. Accordingly, a novel method for the determination of trace Tl by resonance light scattering was developed. The spectrum characteristics were investigated: the resonance fluorescent peak of Rhodamine 6G was at 540 nm and the resonance fluorescent peaks of (Rh6G-I3)n complex particles were at 330, 420, 580 nm. Through condition test, it was determined that 0.4 mL of 0.2 mol/L sulfur acid was used as the medium, 0.4 mL of 0.1 mol/L KI solution and 0.4 mL of 1.0×10-4 mol/L Rhodamine 6G was used, and the reaction time was 5 min. Through further investigation, the intensity increment of resonance scattering light showed linear relationship with Tl at 580 nm. The linear range was 0.005-0.10 mg/L. The detection limit was 0.001 2 mg/L. The proposed method was applied to the determination of Tl in industrial wastewater, whose results were basically consistent with those of ICP-MS. The relative standard deviation (RSD, n=6) was 1.8%-3.2%.
王耐芬, 解清, 刘雅琼, 等.ICP-MS检测铊中毒事件中的痕量铊[J].质谱学报(Journal of Mass Spectrometry), 2001, 21(3):43-46.
[10]
Maia S M, Vale M G R, Welz B, et al. Feasibility of -isotope dilution calibration for the determination of thallium in sediment using slurry sampling electrothermal vaporizationinductively coupled plasma mass spectrometry[J]. Spectro-chim Acta Part B:Atomic Spectroscopy, 2001, 56(7):1263-1275.
