Anion chromatography separation conditions

ICP-MS offers sensitivity, accuracy, and precision with multi-element capabilities, which is not available with other analytical techniques. The unique qualities of ICP-MS, when coupled with proper chromatographic techniques, provides the analyst with concentration and nature of the elemental species present in their samples. Other elemental techniques, which have been coupled with chromatographic systems, do not exhibit the same robustness as has been demonstrated with the ICP-MS [4,5]. Exploiting this ability, we were able to use ICP-MS coupled with an anionic chromatography separation, to determine ideal conditions for remediation of selenium contamination in various aqueous refinery streams. 

Experimental values correlated well with the predicted ones proving that the model is a valuable addition to the theory of ion chromatography [98], Many synthetic dyes are sulphonated derivatives of complicate organic molecules. Because of their strong adsorption capacity their separation under traditional RP-HPLC conditions is sometimes difficult. Anion chromatography offers an advantageous alternative for the analysis of this type of synthetic dyes. 

The maximum retention factor (kQ) is related to the log P value and k and k are the retention factors of the cationic and anionic forms, respectively. The pKa values are known, and the retention factor in a given eluent can therefore be predicted in reversed-phase liquid chromatography using an alkyl-bonded silica gel or polystyrene gel column. The separation conditions can be adjusted according to their logP and pKa values by the selection of a suitable organic modifier concentration and the pH of the eluent.3,4... 

The separation of selenite (SeOs ") and selenate (Se04 ) by anion chromatography with ICP-MS detection is a typical example [27]. The connection of the anion exchange column and direct injection nebulizer to the mass spectrometer and chromatographic conditions are similar to those employed with AES detection [26]. It is important to minimize the dead volume between the column and DIN, otherwise significant broadening of the separated peaks can occur. 

In report separately discuss the peculiarities of determination of the anion composition of the solid solutions, that conditioned by ability of diphosphate anion to destruction in water solutions. In given concrete case by most acceptable method of control of the diphosphate anion in the hydrated solid solutions is a traditional method of the quantitative chromatography on the paper. Methodical ways which providing of minimum destruction of the diphosphate anion in the time of preparation of the model to analysis (translation in soluble condition) and during quantitative determination of the P.,0, anion are considered. 

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