Separation methods Table chromium

Typical effects of the separation methods on the partition coefficient have been studies by Calmano (1979). Data from radionuclide analysis in Table 4-2 indicate that distribution coefficients between solid and aqueous phases generally are higher from filtration methods than from centrifuge separation for cesium and chromium the difference is a factor of about 10, for iron even higher. 

Therefore, if a fast, automated, routine method for the measurement of multi-species/elements is the desired analytical goal, it is often best to attempt an isocratic separation method first, because of the complexity of method development and the low sample throughput of gradient elution methods. In fact, a simultaneous method for the separation of As, Cr, and Se species in drinking water samples was demonstrated by Neubauer and coworkers they developed a method to determine inorganic forms of arsenic (As, As+ ), chromium (Cr , Cr ), and selenium (Se, Se and SeCN ) by reverse-phase ion-pairing chromatography with isocratic elution. Details of the HPLC separation parameters/conditions they used are shown in Table 18.2. 

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