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A novel sorbent-packed planar wall microcolumn-based optosensor coupled to a flow injection analysis system (FIA) for the determination of traces of nitrite by solid-phase spectrophotometry is presented. The methodology is based on the on-line nitrite derivatization with a modified Griess reagent to form an azo-dye whose retention onto octadecyl-covalently bonded silica gel by physical adsorption...
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