Determination of stability constants of Cu(II), Fe(III) and Pb(II) chelates with N,N,N′,N′-ethylenediamine tetrakis (methylenephosphonic acid) by reversed-phase ion-pair chromatography

Li, C. Y.; Gao, Jinzhang; Zhao, Guifang; Kang, Jingwan; He, Haibo

doi:10.1007/bf02496366

Cited by 8 publications

(4 citation statements)

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“…Established separation techniques involve ion pair chromatography (IPC) on reversed phase columns with ion pair reagents [22,40,48] and anion exchange chromatography (IC) [43,49,50]. Detection has been accomplished via photometry after transformation into UVabsorbent metal complexes by pre-column derivatization with iron(III) [22,40,51], ESI-MS [42,48], and phosphorussensitive inductively coupled plasma mass spectrometry (ICP-MS) [43]. The determination from the low to sub μg/L range, as required for the quantification of surface water samples, requires a pre-concentration step.…”

Section: Established Analytical Methodsmentioning

confidence: 99%

Trace-level determination of phosphonates in liquid and solid phase of wastewater and environmental samples by IC-ESI-MS/MS

et al. 2019

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Phosphonates are increasingly used as water-softening agents in detergents, care products, and industrial processes. Despite poor biodegradability, high removal rates during wastewater treatment (WWT) have been observed, owing to strong adsorption affinity to activated sludge and mineral surfaces. Due to phosphonates representing challenging analytes, no method for the compound-specific quantification of phosphonates from solid samples has hitherto been published. In order to improve the data foundation on the environmental fate of phosphonates, an analytical method based on anion exchange chromatography and detection by electrospray ionization coupled to tandem mass spectrometry (IC-ESI-MS/MS) was developed, allowing the trace quantification of phosphonates from surface water (LOQs between 0.04 and 0.16 μg/L), wastewater (LOQs between 0.6 and 2.3 μg/L), sediment and suspended matter of rivers (LOQ < 0.1 mg/kg), and suspended matter of wastewater (LOQ < 1 mg/kg). Specificity and selectivity were enhanced by the implementation of isotope-labeled internal phosphonate standards derived through synthesis. This study describes the development of a comprehensive tool set for the determination of aminotris(methylenephosphonic acid) (ATMP), diethylenetriaminepenta(methylenephosphonic acid) (DTPMP), ethylenediaminetetra(methylenephosphonic acid) (EDTMP), 1-hydroxyethanediphosphonic acid (HEDP), and 2phosphonobutane-1,2,4-tricarboxylic acid (PBTC) during WWT and in the aqueous environment. In the investigated matrices, HEDP and PBTC were generally present in highest and EDTMP in lowest abundance. The phosphonate contents detected in river water were in the sub to low μg/L range, depending on the wastewater burden, whereas contents in the low to medium μg/L range were found in untreated wastewater. The loads of the solid phases exceeded the contents of the corresponding liquid phases by roughly three orders of magnitude. Current data imply that phosphonates undergo significant partitioning to the solid phase during WWT and in natural water bodies.

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Section: Established Analytical Methodsmentioning

confidence: 99%

Trace-level determination of phosphonates in liquid and solid phase of wastewater and environmental samples by IC-ESI-MS/MS

et al. 2019

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“…Therefore, stability constant data of lanthanide/actinide complexes is important in the development of high performance separation procedures. Chromatographic and electrophoretic methods have been studied for the estimation of stability constant of metal complexes from the retention data [13][14][15][16][17][18]. Retention models of metal ion using ion chromatography were reported in literature [19,20].…”

Section: Introductionmentioning

confidence: 99%

Correlation of retention of lanthanide and actinide complexes with stability constants and their speciation

Datta¹,

Sivaraman²,

Viswanathan³

et al. 2013

Radiochimica Acta

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The present study describes a correlation that is developed from retention of lanthanide and actinide complexes with the stability constant. In these studies, an ion-pairing reagent, camphor-10-sulphonic acid (CSA) was used as the modifier and organic acids such as α-hydroxy isobutyric acid (α-HIBA), mandelic acid, lactic acid and tartaric acid were used as complexing reagent for elution. From these studies, a correlation has been established between capacity factor of a metal ion, concentration of ion-pairing reagent and complexing agent with the stability constant of metal complex. Based on these studies, it has been shown that the stability constant of lanthanide and actinide complexes can be estimated using a single lanthanide calibrant. Validation of the method was carried out with the complexing agents such as α-HIBA and lactic acid.It was also demonstrated that data from a single chromatogram can be used for estimation of stability constant at various ionic strengths. These studies also demonstrated that the method can be applied for estimation of stability constant of actinides with a ligand whose value is not reported yet, e.g., ligands of importance in the lanthanide-actinide separations, chelation therapy etc. The chromatographic separation method is fast and the estimation of stability constant can be done in a very short time, which is a significant advantage especially in dealing with radioactive elements. The stability constant data was used to derive speciation data of plutonium in different oxidation states as well as that of americium with α-HIBA. The elution behavior of actinides such as Pu and Am from reversed phase chromatographic technique could be explained based on these studies.

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“…Among the most accomplished techniques are complex formation titrations or electrophoretic or chromatographic separations to measure these thermodynamic values. [5][6][7][8][9][10] The stability constant can be deduced from the law of mass action. Eqn (1) shows the reaction between one trivalent metal ion (Me) and edta (Y) with the resulting stability constant K 1 .…”

Section: Introductionmentioning

confidence: 99%

Determination of stability constants of strong metal–ligand complexes using anion or cation exchange chromatography and atomic spectrometry detection

Wacker

Seubert

2014

J. Anal. At. Spectrom.

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A method for the determination of stability constants of polyaminocarboxylic acid ligands with trivalent metal ions based on the addition of a second metal ion as a competitor has been developed. However, the absolute values of these stability constants are too high for an accurate direct determination. A competition approach delivers the ratio of the stability constants of the two competing metal ions. The different species were separated via anion and cation ion exchange chromatography and their metal content was quantitatively detected online utilizing inductively coupled plasma atomic emission spectrometry. The model ligand used was N,N,N 0 ,N 0-ethylenediaminetetraacetic acid as a most prominent polyaminocarboxylic acid ligand. The trivalent ions of chromium, iron, gallium, indium, and scandium were successfully investigated using this approach.

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Determination of stability constants of Cu(II), Fe(III) and Pb(II) chelates with N,N,N′,N′-ethylenediamine tetrakis (methylenephosphonic acid) by reversed-phase ion-pair chromatography

Cited by 8 publications

References 4 publications

Trace-level determination of phosphonates in liquid and solid phase of wastewater and environmental samples by IC-ESI-MS/MS

Trace-level determination of phosphonates in liquid and solid phase of wastewater and environmental samples by IC-ESI-MS/MS

Correlation of retention of lanthanide and actinide complexes with stability constants and their speciation

Determination of stability constants of strong metal–ligand complexes using anion or cation exchange chromatography and atomic spectrometry detection

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