AI Article Synopsis
- A new capillary electrophoresis method was developed to speciate chromium, particularly focusing on the separation of Cr(III) complexed with DTPA.
- Using a specific phosphate buffer and a voltage for separation, both chromium forms (CrDTPA(2-) and CrO4(2-)) were effectively separated in under 6 minutes with direct UV detection.
- The method's reliability was confirmed by comparing results to flame atomic absorbance spectrometry, ICP-MS, and UV/VIS spectrophotometry, demonstrating its applicability in analyzing chromium in tanning liquor.
Article Abstract
We present a method for the speciation of chromium by capillary electrophoresis. Cr(III) was complexed with diethylenetriaminepentaacetic acid (DTPA) to form a negatively charged complex. Using 20 mM phosphate buffer of pH 8 containing 0.5 mM tetradecyltrimethylammonium hydroxide (TTAOH) at a separation voltage of -15 kV, both forms of chromium CrDTPA(2-) and CrO(4) (2-) were separated in less than 6 min. Direct UV detection at 214 nm was used. The effect of the presence of interfering ions was investigated. The application of the developed method to speciation of chromium in tanning liquor is demonstrated. The obtained results have shown a good correlation with those of flame atomic absorbance spectrometry (FAAS), inductively coupled plasma-mass spectrometry (ICP-MS) and UV/VIS spectrophotometry.
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| http://dx.doi.org/10.1002/elps.200305461 | DOI Listing |
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