Low-temperature Conductivity Detection for Ultrasensitive Ion Chromatography

• Published in: Bulletin of the Korean Chemical Society Vol. 37; no. 3; pp. 321 - 329
• Main Authors: Eom, Jiwon, Lee, Dong Soo
• Format: Journal Article
• Language: English
• Published: Weinheim Wiley-VCH Verlag GmbH & Co. KGaA 01.03.2016; Wiley‐VCH Verlag GmbH & Co. KGaA; 대한화학회
• Subjects: Calibration sensitivity; Conductivity detection; Ion chromatography; Low-temperature; Nonlinear response; 화학
• ISSN: 1229-5949; 0253-2964; 1229-5949
• DOI: 10.1002/bkcs.10673

The effects of conductivity detection temperature on calibration sensitivity and linearity in suppressed ion chromatography using hydronium or hydroxide eluent were investigated. Theoretical calibration curves for lithium and nitrate ions at 0–35 °C were calculated and compared with experimental data. As the detection temperature was lowered, both sensitivity and linearity of calibration at low concentrations were improved due to the reduced interference by water autoionization equilibrium; 4.3‐ and 1.3‐fold increases in linear regression slopes were observed in the 0–1 µmol/L range when the temperature was lowered from 35 to 5 °C for lithium and nitrate, respectively, along with significant increases in the correlation coefficient. Any remaining water autoionization effect was near completely removed by using eluents contaminated with rubidium or bromide ion at 0.1 µmol/L.