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• W2079055289 abstract "Abstract A sensitive, rapid and inexpensive capillary electrophoretic method for the determination of Cr(III) and Cr(VI) species is presented. The method is based on the dual opposite end injection principle and contactless conductometric detection. The sample containing cationic and anionic species is injected into the opposite ends of the separation capillary and after the high voltage is applied, the analytes migrate towards the capillary center, where the cell of a contactless conductivity detector is placed. The method does not require any sample pretreatment, except dilution with deionized water. The separation of Cr(III), Cr(VI) and other common inorganic anions and cations is achieved in less than 4 min. The parameters of the separation electrolyte solution, such as pH and concentration of L ‐histidine, were optimized. Best results were achieved with electrolyte solution consisting of 4.5 m M L ‐histidine, adjusted to pH 3.40 with acetic acid. The detection limits achieved for Cr(III) and Cr(VI) were 10 and 39 μg·L –1 , respectively. The repeatability of migration times and peak areas was better than 0.3% and 2.8%, respectively. The developed method was applied to the analyses of rinse water samples from the galvanic industry. The results for the determination of Cr(III) and Cr(VI) were in good agreement with the results obtained by certified differential spectrophotometric method using diphenylcarbazide (CN 83 0520‐40) and with the results for the total chromium concentrations determined by electrothermal atomic absorbance spectrometry (ET‐AAS) and inductively coupled plasma‐mass spectrometry (ICP‐MS)." @default.
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• W2079055289 date "2003-04-28" @default.
• W2079055289 modified "2023-10-09" @default.
• W2079055289 title "Speciation of chromium (III) and chromium (VI) by capillary electrophoresis with contactless conductometric detection and dual opposite end injection" @default.
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• W2079055289 doi "https://doi.org/10.1002/elps.200390179" @default.
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