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Speciation of chromium by the combination of dispersive liquid–liquid microextraction and microsample injection flame atomic absorption spectrometry

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A microextraction procedure was established for the speciation of total Cr, Cr(III), and Cr(VI). Sudan blue II was used as a ligand for speciation works. Some factors affecting the recoveries of chromium species, including type of extraction and dispersive solvents, pH, ligand amount, extraction time, and matrix ions, were examined. Optimum values for the dispersive liquid–liquid microextraction method were pH 6, LOD 0.34 µg L−1 , and preconcentration factor 400. |

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