Eluents octanesulfonic acid

Eluents and regenerents suitable for the analysis of organic acids when applying an AFS-2 hollow fiber membrane suppressor are listed in Table 4-2. For the analysis of borate and carbonate with octanesulfonic acid as the eluent, an ammonium hydroxide solution with a concentration c = 0.01 mol/L can also be used as the regenerent. 

Fig. 4-4. Analysis of borate and carbonate. — Separator column IonPac ICE-AS1 eluent 0.001 mol/L octanesulfonic acid flow rate 1 mL/min detection suppressed conductivity injection volume SO pL solute concentrations 10 ppm borate and 50 ppm carbonate.

Fig. 4-8. Separation of organic acids upon application of a membrane-based suppressor system. — Separator column IonPac ICE-AS1 eluent 0.001 mol/L octanesulfonic acid flow rate 1 mL/min detection suppressed conductivity injection volume 50 pL solute concentrations 50 ppm oxalic acid (1), 50 ppm tartaric acid (2), 25 ppm fluoride (3), 50 ppm lactic acid (4), 50 ppm formic acid (5), 50 ppm acetic acid (6), and 100 ppm propionic acid (7).

Fig. 5-26 shows the separation of mono-, di-, and triethylamine, accomplished by using octanesulfonic acid as the ion-pair reagent. The less-hydrophobic hexanesulfonic acid is used in combination with boric add as the eluent for the separation of ethanol-amines, as shown in Fig. 5-27. These compounds are detected by measuring the electrical conductance, thus the background conductance is generally lowered with a membrane suppressor. The addition of boric acid to both the eluent and the regenerent serves to enhance the sensitivity for di- and triethanolamine.

Figure 5.9 Separation of borate and carbonate detection suppressed conductivity injection by ion-exclusion chromatography. Separator volume 50 pL peaks 10 mg/L borate (1) and column lonPac ICE-AS1 eluent 1 mmol/L 50 mg/L carbonate (2). octanesulfonic acid flow rate 1 mlVmin ...

Figure 10.147 Analysis of a HF/HNOb/HOAc etching mixture. Separator column lonPac ICE-AS1 eluent 1 mmol/L octanesulfonic acid/ 2-propanol (955 v/v) flow rate 1 mt/min ...

Figure 4.12 Effect of counter-ions and copper on the retention of amino acids. Column, octadecyl-bonded silica gel, 25 cm x 4.6 mm i.d. eluent, 0.01 M sodium acetate buffer (pH 5.6) containing 1.2 mM sodium octanesulfonate (Oc) andj or 0.1 mM copper acetate (Cu) flow rate, 1ml min-1 detection, UV 220 nm. Compounds Glu, glutamic acid, Asp, aspartic acid.

RG. 5. Separation of transition metals by ion interaction chromatography. A Waters (xBondapak C g column was used with SO mM tartaric acid and 2 mM sodium octanesulfonate at pH 3.4 as eluent. Detection by postcolumn reaction with PAR. The detection wavelength was S46 nm. Solute concentrations Co (S ppm) Ni, Cd (2 ppm) remainder (1 ppm). (Courtesy of Waters Chromatography Division.)... 

The GABA uptake inhibitor tiagabine (Figure 6.61) has been measured in plasma using an ODS-modified silica analytical column with acetonitrile-methanol-water (37 + 10 + 53) containing phosphoric acid and sodium phosphate (both lOmmolL ) and sodium octanesulfonate (5mmolL ) as eluent, and ED (PGEs,... 

Karcher and KruII [30] used complexometric calculations to determine the mobile phase concentrations of HIBA and tartaric acid needed to fine tune their separation of eleven metal cations on C and Ci silica-based reverse-phase columns which had been dynamically modified with n-octanesulfonate. Isocratic elution was used to separate the metals into three distinct windows each window corresponding to one of the three dififerent valence states spanned by the eleven metal cations. The metals eluted in the order of increasing valence, with the sole exception of La(III) which did not elute within the trivalent ion window. Figure 6.15 illustrates the separation of ZrdV), Ga(III), Sc(III), Y(III), Al(III), In(III), Zn(II), La(III), Cd(II), Ca(II), and Mg(II) using a Cis column and an eluent comprised of 2.27 mM n-octanesulfonate, 8.18 mM tartaric acid, 52.9 mM HIBA, and 10.7% (v/v) methanol. 

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