Eluant oxalic acid

Polyspher IC AN-1 from Merck AG (Darmstadt, Germany), consisting of a hydrophilic polymethacrylate packing with a particle diameter of 12 pm, exhibits a similar selectivity. Depending on the type of application, this column can be operated with eluants based on phthalic acid, p-hydroxybenzoic acid, tartaric acid, oxalic acid, or boric acid. Figure 3-16 shows a typical chromatogram obtained with a phthalic acid eluant. Under these chromatographic conditions (pH 4) orthophosphate elutes as a monovalent anion ahead of chloride. 

Fig. 3 -125. Comparison between the retention behavior of inorganic anions and several carboxylic acids. -Separator columns 2 lonPac AS4 eluant 2.8 mmol/L NaHCOs + 2.2 mmol/L Na2COj flow rate 1.6 mL/min detection suppressed conductivity injection 50 pL solute concentrations A) 1.5 mg/L fluoride (1), 2 mg/L chloride (2), 5 mg/L each of orthophosphate (3) and bromide (4), 10 mg/L nitrate (5), and 12.5 mg/L sulfate (6), B) 5 mg/L formic acid (7), 40 mg/L benzoic acid (8), 20 mg/L succinic acid (9), 10 mg/L malonic acid (10), 20 mg/L each of maleic acid (11), tartaric acid (12), and oxalic acid (13).

Fig. 4-29. Separation of alkaline-earth metals on a silica-based cation exchanger. — Separator column Nucleosil 5 SA eluant 3.5 mmol/L oxalic acid +...

Fig. 4-32. Separation of transition metals together with alkali- and alkaline-earth metals on PBDMA-coated silica. - Separator column LiChrosil IC CA column temperature 40°C eluant 2 mmol/L tartaric acid a- 0.5 mmol/L oxalic acid flow rate 1 mL/min detection ...

If the eluant contains complexing agents such as citric acid or oxalic acid, then the equation for the distribution coefficient of the metal ion, M , must also take into account the competing equilibrium of the complex formation. The complex formation coefficient may be expressed as follows ... 

Fig. 4-52. Separation of some selected transition metals with oxalic acid as a complexing agent. - Separator column lonPac CSS eluant 50 mmol/L oxalic acid, pH 4.8 with LiOH flow rate, detection and injection volume see Fig. 4-50 solute concentrations 4 mg/L Pb (1), 0.5 mg/L Cu (2), 4 mg/L Cd (3), 2 mg/L Co (4), 2 mg/L Zn (5), and 4 mg/L Ni (6).

Fig. 4-57. Separation of transition metals on the ionPac CS5A bifunctional latexed cation exchanger with oxalic acid as a complexing agent. - Eluant ...

Fig. 5-3. Separation of carboxylic acids and hydroxycarboxylic acids on lonPac ICE-AS6. - Eluant 0.4 mmol/L heptafluorobutyric acid flow rate 0.4 mL/min detection suppressed conductivity injection volume 50 pL solute concentrations 5 mg/L oxalic acid (1), 10 mg/L tartaric acid (2),...

Di-basic acids are eluted prior to the corresponding mono-basic acids because of their higher solubility in polar eluants. Thus, it is observed that oxalic acid elutes prior to acetic acid, and malonic acid prior to propionic acid. 

Fig. 9-24. Transition metal analysis in an industrial wastewater. - Separator column lonPac CS5A eluant 0.05 mol/L oxalic acid + 0.095 mol/L LiOH flow rate ...

Fig. 9-150. Isocratic separation of transition metals in various wines after UV photolysis. - Separator column lonPac CS5A eluant 80 mmol/L oxalic acid +...

Sb, and Sn tracers on Dowex-1 columns using 0. IM oxalic acid as the eluant. 

Fig. 4-61. Simultaneous analysis of transition metals and lanthanides. - Separator column ionPac CSS eluant (A) water, (B) 6 mmol/L PDCA + 50 mmol/L NaOAc + 50 mmol/L HOAc, (C) 0.1 mol/L oxalic aicd + 0.19 mol/L LiOH, (D) 0.1 mol/L diglycolic acid + 0.19 mol/ L LiOH flow rate 1 mL/min detection see Fig. 4-60 injection volume 50 pL solute...

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