Efficiency and characteristics of solid-phase (ion-exchange) extraction for removal of Cl− matrix

Razpotnik, Polona; Turšič, Janja; Veber, Marjan; Novič, Milko

doi:10.1016/s0021-9673(03)00216-4

Cited by 12 publications

(7 citation statements)

References 21 publications

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“…Locally concentrated silver ions can easily cause the coprecipitation of silver with other coexisting anions, creating mass transfer resistance for the migration of trace anions in the solution. On the other hand, the highly concentrated nitrate ions can also interfere in the determination of other coexisting anions by ion chromatography [1]. Clearly, a suitable precipitating reagent should be the one that not only provides the precipitating ions at a desirable speed such that only silver chloride is formed, but also brings no interfering anions into the solution.…”

Section: Theorymentioning

confidence: 99%

“…This is true for the anions chromate, phosphate, and oxalate. Based on a bulk silver concentration of 1.3610 -7 mol/L after sample treatment and the mathematical formula above, the critical precipitating concentrations for chromate, phosphate, and oxalate were estimated to be 1 high concentration in a chloride-rich sample; thus the spiked samples were all accurately recovered as shown in Table 2. On the other hand, due to the low solubility of silver bromide (AgBr: k sp = 5.0610…”

Section: Applicability and Limitationsmentioning

confidence: 99%

“…To eliminate the contamination of the silver ions leaked from the silver cartridge, a high-capacity hydrogen cartridge was usually utilized after the silver treatment [1]. However, with the sample treatment proposed in this study, the post-treatment can be omitted.…”

Section: The Effect Of Silver On the Performance Of Analytical Columnmentioning

confidence: 99%

“…A common case is the determination of trace anions in chloride-rich samples [1]. There has been tremendous effort in tackling with the interference on the detection of trace anions caused by the high concentration of chloride [1 -6].…”

Section: Introductionmentioning

confidence: 99%

“…However, in some cases, a reasonable resolution between the interested compounds and chloride might be still difficult to achieve and the performance of the column can significantly vary with time depending on the nature and the loading of the samples. A commonly accepted methodology in dealing with the interference is to reduce the free chloride ions from the sample matrix using a high-capacity silver cartridge [1,5,9,11]. The reduction of chloride concentration based on this methodology is to form silver chloride inside the cartridge.…”

Section: Introductionmentioning

confidence: 99%

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Reduction of chloride matrix effect using silver oxide as a precipitating reagent for the determination of trace anions in chloride‐rich samples via ion chromatography

Fu¹,

Chuncheng²,

Zhao

et al. 2007

J of Separation Science

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Original PaperReduction of chloride matrix effect using silver oxide as a precipitating reagent for the determination of trace anions in chloride-rich samples via ion chromatography A new method was developed for the determination of trace anions in chloride-rich samples via ion chromatography by reducing the concentration of chloride ions using silver oxide as a precipitating reagent. In this method the sample pretreatment was started with the addition of silver oxide powder followed by 8 min of stirring and 2 min of centrifugation at a speed of 1500 rpm. The supernatant was diluted with a 1:10 ratio using deionized water and filtered with a 0.22 lm NC filter. All the samples were analyzed in a Dionex ICS-2500 system with an ED50 electrochemical detector in conductivity mode. On the basis of Dionex IonPac AG18 (50 mm62 mm) and AS18 (250 mm62 mm) columns, 25 lL sample filtrate was eluted isocratically with a mobile phase of 32 mmol/L NaOH at a flow rate of 0.25 mL/ min and each eluted analyte was detected after postcolumn suppression via a Dionex anion suppressor ULTRA II (2 mm). With this method most of the common anions at mg/kg level in chloride-rich samples can be accurately quantified. By controlling the equivalent weight ratio of silver oxide to chloride in sample solutions and the time of pretreatment, the free silver and chloride ions in the sample solution are optimized such that most coexisting common anions can be determined simultaneously.

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Section: Theorymentioning

confidence: 99%

Section: Applicability and Limitationsmentioning

confidence: 99%

Section: The Effect Of Silver On the Performance Of Analytical Columnmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%