Catalytic decloring spectrophotometric determination of trace chromiumⅥin electroplating wastewater after separationand enrichment with extraction-elution resin
BAI Shan1, OUYANG Zhen-zhong1, LUO Dao-cheng*2
1.Changsha Environmental Protection College,Changsha 410004,China; 2.School of Chemistry and Chemical Engineering,Hunan University of Science and Technology,Xiangtan 411201,China
Abstract：The sample solution passed through micro resin exchange column for exchange and separation at flow rate of 1.0 mL/min. CrⅥ in the sample was adsorbed by tributyl phosphate (TBP) extraction-elution resin. After elution with 0.5 mol/L HCl and water, CrⅥ could be separated from metal ions that had interference with determination such as Fe3+, Al3+ and Cr(Ⅲ), which realizing the separation and enrichment of CrⅥ. In 0.05 mol/L H2SO4 medium, trace CrⅥ could strongly catalyze the oxidizing decoloring reaction between potassium periodate and nuclear fast red. Consequently, a new determination method of trace chromiumⅥ by catalytic spectrophotometry was established. The maximum absorption wavelength of this system was 555 nm. Beer’s law was obeyed for CrⅥ in range of 0-10.0 μg/L. The detection limit was 2.01×10-2 μg/L. The proposed method was applied to the determination of trace chromiumⅥ in electroplating wastewater. The results were consistent with those obtained by inductively coupled plasma atomic emission spectrometry (ICP-AES). The relative standard deviation (RSD, n=6) was less than 4%.
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