Determination of inorganic anions by ion chromatography with ultraviolet absorbance detection

Abstract

This work describes the appllcatlon of varlable wavelength UV detectlon In sorles with the normal conductlvlty detector, In ion chromatography for the determlnatlon of lnorganlc anions. This comblnatlon of detectors greatly Increases the amount of informatlon that can be collected on a glven sample. The appllcatlon of IJV detection has the foliowlng advantages: (1) ald In the identtflcatlon of unknown peaks, (2) use In resolving overlapplng peaks, (3) help In ellmlnatlng problems assoclated wlth the carbonate dlp, (4) reductlon of problems assoclated wlth ion excluislonIn the suppressor column, (5) ablllty to detect anlons not normally detected by the conductlvlty detector, e.g., stilflde and arsenlte.

Identification and quantification of inorganic and organic selenium compounds with highperformance liquid chromatography

“…The interference from chloride in the determination of selenite was removed by passing the solution through a silver-ion-loaded cationexchange resin;53 interferences from sulfate were eliminated with a barium-ion-loaded ~o l u m n .~.~~ Because sulfate, in contrast to selenite and selenate, does not absorb above 190 nm, the selenium compounds were detected without sulfate inter-ference by means of UV-detector set at 195 nm. 61 The detection limit for selenate in this system was rather poor (30ngSe as selenite, 800ngSe as selenate). Operating a UV-detector in this optical range requires a sufficiently transparent eluent.…”

Simultaneous determination of bromide and nitrate in contaminated waters by ion chromatography using amperometry and absorbance detectors

“…Then the ions with eluent flow through anion suppressor unit, where the hydroxide eluent converts to water and the analyte ions to corresponding acids. This leads to enhanced sensitivity of UV detection as the eluent is UV absorbing in its deprotonated state [17,31]. Since both Br − and NO 3 − are UV active, the peak registered by the UV detector is the summation of the two ions.…”

“…have large extinction coefficients between 195 and 215 nm to make UV absorbance detection a useful analysis technique for these ions [30]. Both Br − and NO 3 − exhibit useful UV absorbance at 210 nm and direct monitoring of UV absorbance is the most straightforward mode of detection for these ions [31,32].…”

A Coulometric Analysis Method and an Ion-exclusion Chromatographic Method for the Determination of Antimony(V) in Large Excess of Antimony(III)

“…52 In the ion-exclusion chromatographic method, the wavelength used for the detection of antimony(V) was 190 nm. Though hydrochloric acid is one of the possible eluents to separate antimony(V) from antimony(III), the UV absorption of the acid increases with a decrease of the wavelength in the UV region.…”