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- W2039732677 abstract "A published method for the determination of heavy metals was applied to the determination of Cu(II), Ni(II), Zn(II) and Mn(II) in synthetic solutions that contained one of the following ligands (L): citrate, nitrilotriacetate (NTA), ethylenediaminetetraacetate acid (EDTA) and cyclohexylenediaminetetraacetate (CDTA). The method involves on-column derivatization with 2,6-pyridinedicarboxylic acid (PDCA) and ion-exchange separation, followed by post-column reaction with 4-(2-pyridylazo)resorcinol (PAR) to form metal-PAR chelates, which can be sensitively monitored by spectrophotometric detection at 520 nm. Solutions with 12.6 μ mol/1 of Cu(II), Ni(II), Zn(II) and Mn(II) and 12.6 or 25.2 μmol/1 of L were analysed. A 100% recovery was obtained for all metals with citrate or NTA, for Cu(II), Zn(II) and Mn(II) with EDTA and only for Mn(II) with CDTA. The recoveries in further cases were Ni(II)-EDTA ⩽68%, Ni-CDTA ⩽80%, Cu(II)-CDTA ⩽20 and Zn(II)-CDTA ⩽87%. To interpret these results, simpler solutions with 12.6 or 6.3 μmol/1 Cu(II) and Cu:L ratios (R) in the range 4.2-0.26 were analysed. For both citrate and NTA an almost 100% recovery of Cu(II) was found for all values of R. For EDTA, 100% recovery was only observed for R⩾1.0. For CDTA the recoveries were between 76% (R = 4.2) and 0% (R⩽0.52). Speciation calculations showed that only kinetic factors were responsible for the inefficiency of both the on-column and the post-column derivatizations. Analytical implications of the results are discussed." @default.
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- W2039732677 date "1995-04-01" @default.
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- W2039732677 title "Limitations of ion chromatography with post-column reaction for determination of heavy metals in waters containing strong chelating agents" @default.
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- W2039732677 doi "https://doi.org/10.1016/0021-9673(94)01295-p" @default.
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