title: Selective removal of carbon dioxide contained in the effluent from ion chromatography suppressors using a new non-vacuum device.
abstract: In this paper, a new CO2 gas removal device optimized to selectively remove CO2 gas contained in the effluent from suppressors used in ion chromatography (IC) under non-vacuum conditions is described. This device consists of a closed vessel equipped with gas permeable tubing (GPT) and a CO2 adsorbent. During operation, the CO2 adsorbent adsorbs CO2 gas in the vessel, creating CO2 partial pressure difference between the inside of the GPT and the vessel. The CO2 gas contained in the effluent being pumped into the GPT is selectively removed from the effluent based on the diffusion of the CO2 associated with the CO2 partial pressure difference. The purpose of this study is to optimize the IC operating conditions with the aim of selectively removing HCO3(-) (CO3(2-)) contained in the effluent and reducing the electrical conductivity of the effluent under non-vacuum conditions. The electrical conductivity of the effluent and the signal intensity of the water dip is decreased by approximately 25 μS/cm (from 30 to 5 μS/cm) and by approximately twentieth, respectively, using the optimized CO2 remover. In addition, the anion detection limit achieved in IC instruments with a CO2 remover is on the order of a few ppb.
authors: Nichiri Mfg. Co., Ltd., 324-5, Takatu, Yachiyo, Chiba 276-0036, Japan. Electronic address: h.masunaga@nichiri-mfg.co.jp.
authors: Hiroto
authors: H
authors: Masunaga
authors: Nichiri Mfg. Co., Ltd., 324-5, Takatu, Yachiyo, Chiba 276-0036, Japan.
authors: Yuji
authors: Y
authors: Higo
authors: Nichiri Mfg. Co., Ltd., 324-5, Takatu, Yachiyo, Chiba 276-0036, Japan.
authors: Mizuo
authors: M
authors: Ishii
authors: Nichiri Mfg. Co., Ltd., 324-5, Takatu, Yachiyo, Chiba 276-0036, Japan.
authors: Noboru
authors: N
authors: Maruyama
authors: Department of Applied Science, Okayama University of Science, 1-1 Ridaicho, Okayama 700-0005, Japan.
authors: Shigeo
authors: S
authors: Yamazaki
mesh_terms: D000838:Anions / Q000032:analysis; D002245:Carbon Dioxide / Q000302:isolation & purification*; D002852:Chromatography, Ion Exchange / Q000295:instrumentation*; D014618:Vacuum
chemical_list: D000838:Anions; D002245:Carbon Dioxide
keywords: CO(2) adsorbent; Gas permeable tubing; Ion chromatography for anion analysis; Non-vacuum; Selective CO(2) removal; Suppressor