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Wang SK, Wei XY, Li S, Liu FJ, Wang YG, Li ZK, Shi C, Yang Z, Zong ZM. Rapid analysis of carboxylic acids and esters with a direct analysis in real time ion source. RAPID COMMUNICATIONS IN MASS SPECTROMETRY : RCM 2018; 32:1521-1528. [PMID: 29729046 DOI: 10.1002/rcm.8156] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/20/2017] [Revised: 03/26/2018] [Accepted: 04/24/2018] [Indexed: 06/08/2023]
Abstract
RATIONALE Coal oxidation produces carboxylic acids (CAs), including aliphatic acids, benzoic acids, and benzenepolycarboxylic acids, which are important fine chemicals which could be used to understand the structural features of coals. However, detecting CAs usually presents great challenges due to extremely troublesome pretreatments. Therefore, it is essential to develop an analytical method for the rapid detection of CAs from coal oxidation. METHODS A series of model compounds (MCs) of oxidation products and two practical samples were investigated by direct analysis in real time time-of-flight mass spectrometry (DART-TOFMS) under three different analytical conditions (ionizing gas temperature, organic solvent, and MC concentration). RESULTS Ionizing methyl benzoate, dimethyl phthalate, and dimethyl adipate produces typical ions of methyl esters, including [M - OCH3 ]+ , [M + H]+ , and [M + NH4 ]+ . In contrast, the characteristic ions generated from CAs are polymer ions, such as [2 M + NH4 ]+ , [3 M + NH4 ]+ , [4 M + NH4 ]+ , and [5 M + NH4 ]+ , indicating the strong intermolecular hydrogen-bond interaction among CAs. CONCLUSIONS Results suggest that DART-TOFMS could rapidly analyze CAs or esters in coal oxidation products according to their typical ions to further gain deep insights into the coal structure.
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Affiliation(s)
- Sheng-Kang Wang
- Key Laboratory of Coal Processing and Efficient Utilization, Ministry of Education, China University of Mining & Technology, Xuzhou, 221116, Jiangsu, China
| | - Xian-Yong Wei
- Key Laboratory of Coal Processing and Efficient Utilization, Ministry of Education, China University of Mining & Technology, Xuzhou, 221116, Jiangsu, China
- State Key Laboratory of High-efficiency Coal Utilization and Green Chemical Engineering, Ningxia University, Yinchuan, 750021, Ningxia, China
| | - Sheng Li
- Key Laboratory of Coal Processing and Efficient Utilization, Ministry of Education, China University of Mining & Technology, Xuzhou, 221116, Jiangsu, China
| | - Fang-Jing Liu
- Key Laboratory of Coal Processing and Efficient Utilization, Ministry of Education, China University of Mining & Technology, Xuzhou, 221116, Jiangsu, China
| | - Yu-Gao Wang
- College of Chemistry and Chemical Engineering, Taiyuan University of Technology, Taiyuan, 030024, Shanxi, China
| | - Zhan-Ku Li
- School of Chemistry and Chemical Engineering, Anhui Key Laboratory of Coal Clean Conversion and Utilization, Anhui University of Technology, Ma'anshan, 243002, Anhui, People's Republic of China
| | - Chong Shi
- Key Laboratory of Coal Processing and Efficient Utilization, Ministry of Education, China University of Mining & Technology, Xuzhou, 221116, Jiangsu, China
| | - Zheng Yang
- Key Laboratory of Coal Processing and Efficient Utilization, Ministry of Education, China University of Mining & Technology, Xuzhou, 221116, Jiangsu, China
| | - Zhi-Min Zong
- Key Laboratory of Coal Processing and Efficient Utilization, Ministry of Education, China University of Mining & Technology, Xuzhou, 221116, Jiangsu, China
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