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- W2046528797 abstract "The formation of the lutetium, trans-1,2-diaminocyclohexane-N,N,N',N'-tetraacetic acid, and 8-hydroxyquinoline-5sulfonic acid (Lu-CDTA-HQS) fluorescent ternary complex is used to determine chelating ligands. The ligands are complexed with Lu 3+ and separated on an anion-exchange column. The eluent mixes with 1 mM CDTA-HQS postcolumn reagent. CDTA displaces the analyte ligand from its lutetium complex to form the more stable Lu-CDTA complex, which further complexes with HQS to form the ternary fluorescent complex. The mechanism and kinetics of this postcolumn reaction are discussed. The scheme of sequential addition of CDTA-HQS at low pH and followed by NaOH enables detection of triethylenetetramine (Trien), tetraethylenepentamine (Tetren), nitrilotriacetic acid (NTA), ethylene glycol-bis(β-aminoethylether) N,N,N',N',-tetraacetic acid (EGTA), ethylenediaminetetraacetic acid (EDTA), diethylenetriaminepentaacetic acid (DTPA) and CDTA. The ligands of NTA, EGTA, EDTA, DTPA, and CDTA were separated by ion chromatography and detected with postcolumn addition of CDTA-HQS (pH 2.8) and then NaOH. The detection limits obtained were l.lo -7 M (ca. 1 ng) for NTA, 2.5.lo -8 M (ca. 0.5 ng) for EGTA, 2.5.lo -8 M (ca. 0.5 ng) for EDTA, 5.lo -8 M (ca. I ng) for DTPA, and 5.lo -8 M (ca. I ng) for CDTA. The response linear range for NTA was from 100 ng to 2.5 ng ; for EGTA from 750 ng to 1 ng ; for EDTA from 750 ng to 1 ng ; for DTPA from 5000 ng to 1 ng ; and for CDTA from 5000 ng to 2 ng. The existence of ten-fold excess alkaline earth metal and transition metal ions did not interfere with the determination of these chelating ligands after a metal-exchange sample pretreatment step was included in the procedure. The recovery rates were greater than 80%." @default.
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- W2046528797 date "1996-07-01" @default.
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- W2046528797 title "Ion chromatographic determination of chelating ligands based on the postcolumn formation of ternary fluorescent complexes" @default.
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- W2046528797 doi "https://doi.org/10.1016/0021-9673(96)00047-7" @default.
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