Non-suppressed ion chromatography of inorganic anions, magnesium and calcium ions using a pyromellitate eluent and its application in evaluating environmental water quality

2,6-Pyridinedicarboxylic acid as an eluent for UV and conductivity detection of inorganic anions, magnesium and calcium in water by ion chromatography

“…(3) clearly indicates that the conductivity sensitivity increases with decreasing conductance of eluting ion. On the basis of Eqs (1)- (3), we conducted a preliminary study of the effectiveness of eluenting ions with high molar absorptivity and low background conductance (such as trimesic and pyromellitic acids and 2,6-PDC) which could complex with Mg 2+ and Ca 2+ to form anionic complexes [12][13][14]. Figure i shows the separation of solutes with indirect UV detection using (a) a trimesic acid eluent (0.5 mM at pH 6.0) and (b) a pyromellitic acid eluent (0.5 mM at pH 6.0).…”

“…Absorbance increases with increasing molar absorptivity of the eluting ion, and decreases with increasing the charge on the eluting ion. For conductivity detection, the change in conductance (AG) is given by [12] …”

“…There are few reports of simultaneous separation of anions and cations with both detection modes in nonsuppressed IC. Recently, ion chromatographic separations of common inorganic anions, Mg 2+ and Ca 2+ in water samples have been developed using aromatic, carboxylic acidic eluents [12,13]. These methods did not however separate H2PO 4-from other common anions.…”

“…Furthermore, eluent ions with high molar absorptivity and low background conductance enable the simultaneous employment of both indirect UV and conductivity in IC. For example, aromatic carboxylic acids [12] can be used as the eluents for anions and aromatic bases for cations [11]. There are few reports of simultaneous separation of anions and cations with both detection modes in nonsuppressed IC.…”

Development and Validation of a Capillary Zone Electrophoresis Method for the Determination of Calcium in Composite Biomaterials

“…Bioglass®, containing Ca 2+ among other ions, are involved in osteogenic and bone forming responses [3][4]. Due to inorganic ions usually have little UV (ultraviolet) absorbance or no chromophores groups in their chemical structure, conventional quantitation methods such as high performance liquid chromatography (HPLC) are not possible to employ and more sophisticated techniques are usually required such as ion chromatography (IC) [18][19][20][21][22][23], flame atomic absorption spectrometry (FAAS) [24][25] and flame atomic emission spectrometry (FAES) [24][25]. In this way, there are According to our knowledge, there is no report in literature about CE methods for Ca 2+ quantitation from this kind of biomaterials.…”