Assuring precision and calibration linearity in ultrasensitive suppressed ion chromatography by using deliberately contaminated hydroxide eluent

Jiwon Eom, Gahyeon Lee, Dong Soo Lee

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1 Citation (Scopus)

Abstract

Experimental: and theoretical studies were conducted to investigate low and non-linear responses in sub-micro molar-level suppressed ion chromatography with a hydroxide eluent. A calculated response was derived using experimentally determined detector effluent ion composition data and compared with measured experimental responses. The calibration curve was non-linear, and its slope varied considerably with different instrumental setups and operating conditions. The non-linearity of the solution conductivity response was determined by two acid-base equilibria of water and carbonic acid, and fluoride ion. By using eluent contaminated with para-toluene sulfonate at micro molar level, the non-linear response was greatly alleviated.

Original languageEnglish
Pages (from-to)90-98
Number of pages9
JournalJournal of Chromatography A
Volume1557
DOIs
Publication statusPublished - 2018 Jul 6

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Ion chromatography
Calibration
Chromatography
Carbonic Acid
Ions
Acid-Base Equilibrium
Bicarbonates
Fluorides
Effluents
Theoretical Models
Detectors
Water
Chemical analysis
hydroxide ion
4-toluenesulfonic acid

All Science Journal Classification (ASJC) codes

  • Analytical Chemistry
  • Biochemistry
  • Organic Chemistry

Cite this

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AB - Experimental: and theoretical studies were conducted to investigate low and non-linear responses in sub-micro molar-level suppressed ion chromatography with a hydroxide eluent. A calculated response was derived using experimentally determined detector effluent ion composition data and compared with measured experimental responses. The calibration curve was non-linear, and its slope varied considerably with different instrumental setups and operating conditions. The non-linearity of the solution conductivity response was determined by two acid-base equilibria of water and carbonic acid, and fluoride ion. By using eluent contaminated with para-toluene sulfonate at micro molar level, the non-linear response was greatly alleviated.

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