Abstract
The surfactant sensitized spectrofluorimetry for speciation of chromium (Cr(VI)/Cr(III)) was developed. The analytical procedure was that the fluorescence intensity of l4,10,16,22-tetramethoxyl resorcinarene carboxylic acid derivatives (TRCA) could be selectively quenched by Cr(VI) and the fluorescence quenching value (ΔF=FTRCA-FCr(VI)-TRCA) was increased in cetyltrimethylammonium bromide (CTAB). The main influence factors on the fluorescence quenching (ΔF) were investigated in detail. Under the optimal conditions, the linear range of calibration curve for the determination of Cr(VI) was 0.10~5.00 μg/mL, and the detection limit was 0.024 μg/mL with RSD=2.10% (c=1.0 μg/mL, n=3). The concentration of Cr(III) was calculated by subtracting Cr(VI) from the total chromium determined after oxidizing Cr(III) to Cr(VI). The preliminary sensitized mechanism was discussed with the inclusion constant (K) of TRCA-Cr(VI), the fluorescence quantum yield of TRCA, and IR spectra characterization. The method has been applied to the speciation analysis of Cr(VI)/Cr(III) in water samples.
Highlights
Chromium (Cr) is one of the most commonly present heavy metal pollutants in industrial wastewater
The World Health Organization (WHO) and the US Environmental Protection Agency (EPA) recommend that the concentration of Cr(VI) in drinking water should be less than 0.05 mg L−1 and 0.1 mg L−1, respectively [1,2,3,4,5]
It could be seen that the fluorescence intensity of tetramethoxyl resorcinarene carboxylic acid derivatives (TRCA) (FTRCA) was enhanced in presence of cetyltrimethylammonium bromide (CTAB) (FTRCA-CTAB), and the ΔF2 = FTRCA-CTAB − FCr(VI)-TRCA-CTAB was larger than that ΔF1 = FTRCA − FCr(VI)-TRCA with the same concentration of Cr(VI): there was the sensitizing
Summary
Chromium (Cr) is one of the most commonly present heavy metal pollutants in industrial wastewater. Cr(VI) is much more mobile, toxic, and carcinogenic than Cr(III), which is widely used in electroplating, leather tanning, metal finishing, photography and dye and textile industries. The effluents from these industries often contain elevated levels of Cr(VI). The World Health Organization (WHO) and the US Environmental Protection Agency (EPA) recommend that the concentration of Cr(VI) in drinking water should be less than 0.05 mg L−1 and 0.1 mg L−1, respectively [1,2,3,4,5]. The development of accurate and reliable methods for the speciation of Cr(III)/Cr(VI) in water samples is of particular significance to obtain comprehensive information about their toxicity and human health relevance
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