Colorimetric analysis based on solid-phase extraction with sedimentable dispersed particulates: demonstration of concept and application for on-site environmental water analysis

Kohama, Nozomi; Matsuhira, Koki; Okazaki, Takuya; Sazawa, Kazuto; Hata, Noritake; Kuramitz, Hideki; Taguchi, Shigeru

doi:10.1007/s00216-022-04375-y

Cited by 2 publications

(1 citation statement)

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“…The detection of chemicals in environmental water samples often requires pretreatments such as the separation and concentration of water [1][2][3][4]. Organic ion-associate phase (IAP) microextraction is one such pretreatment [5][6][7][8][9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Evaluation of an Ion-Associate Phase Formed In Situ from the Aqueous Phase by Adding Benzethonium Chloride and Sodium Ethylbenzenesulfonate for Microextraction

et al. 2023

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The concentration region at which the solvent is formed during in situ solvent formation microextraction is determined by varying the concentrations of the two components required to form a solvent. In particular, a solvent is formed in situ during ion-associate phase (IAP) microextraction by mixing an aqueous solution with an organic cation and an organic anion. In this study, benzethonium chloride (BenCl) and sodium ethylbenzenesulfonate (NaEBS) were employed as the organic cation and anion sources of model IAPs to thoroughly investigate the in situ solvent formation. Additionally, the formation of the IAPs and the solvent via centrifugation of the formed ion associates was examined. We demonstrated that ion associates are formed when the product of [EBS] and [Ben] is greater than the solubility product and [EBS] is greater than [Ben]. The highest extraction of polycyclic aromatic hydrocarbons (PAHs) was achieved with an amount of NaEBS 40 times greater than that of BenCl. A higher hydrophobicity in the IAP extraction of PAHs, estrogens, and pesticides facilitated extraction into the IAP.

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