Investigation of Atmospheric Pressure Photochemical Ionization Mass Spectra of Binary Organic Solutions without Their Se
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Investigation of Atmospheric Pressure Photochemical Ionization Mass Spectra of Binary Organic Solutions without Their Separation in Dependence on the Concentration of Solutions and Analyte Vapors in Nitrogen Using the Exponential Dilution Method and a Time-of-Flight Mass Spectrometer with an Atmospheric Pressure Photochemical Ionization Ion Source I. A. Revelskya, A. A. Sysoeva, A. I. Revelskya, A. G. Adamova, S. S. Poteshina, A. S. Samokhina, M. E. Chivarzina, *, D. A. Chepelyanskya, and Yu. S. Yashina a
Department of Chemistry, Lomonosov Moscow State University, Moscow, 119991 Russia *e-mail: [email protected] Received December 24, 2019; revised January 13, 2020
Abstract—The study is devoted to the investigation of atmospheric pressure photochemical ionization mass spectra of binary organic solutions of a small set of the analytes (dibutyl ether, propyl acetate, amyl acetate) in the same solvent (acetone) in the vapor phase and in a nitrogen flow without their separation in dependence on the analyte concentration in the solution and in nitrogen. The study was carried out using a custommade time-of-flight mass spectrometer combined with a custom-made atmospheric pressure photoionization (APPhI) ion source coupled to an exponential dilution flask. Solvent vapor concentration in the nitrogen flow was 10–1–10–4%. Analyte concentration in the same flow was 10–3–10–6%. Exponential dilution was carried out using a heated exponential dilution flask with a magnetic stirrer. The temperature of the flask, glass transfer line to the APPhI ion source, and of the ion source itself was 80°С. It was shown that, at the initial acetone and analyte concentrations in nitrogen equal to 10–1 and 10–3%, respectively, mass spectra of the solution vapors contained peaks of ions, such as [M–H]+, M•+, [M + H]+, [2M + H]+, [M + Mа• + H]+, [Mа + H]+, and [2Mа + H]+. When acetone and analyte concentrations in nitrogen were equal to 10–3 and 10–6%, respectively, mass spectra of each analyte revealed mainly peaks of the [M–H]+ ion for dibutyl ether and amyl acetate and peaks of [2M + H]+ and M•+ ions for propyl acetate. Keywords: atmospheric pressure photo- and photochemical ionization mass spectrometry, exponential dilution, time-of-flight mass spectrometer, mixture analysis without separation DOI: 10.1134/S1061934820140117
INTRODUCTION Atmospheric pressure photochemical ionization mass spectrometry (APPhI–MS) in combination with capillary gas chromatography, and also atmospheric pressure photoionization mass spectrometry (APPI– MS) has first been proposed by Revelsky and Yashin with coworkers in 1985 [1, 2]. It has been shown that the sensitivity of APPhI–MS is 10–100 times higher than that of APPI–MS: the limit of detection for benzene by APPI–MS was of about 10–12 g and that for benzophenone by APPhI–MS, about 10–14 g (in the single ion registration mode) [2]. A possibility of the direct analysis of a mixture of aromatic hydrocarbons in hexane by APPhI–MS without analyte separation was shown in the same work [2]. In this case, sol
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