Citation: LIANG Da-Peng, FANG Yuan-Ping, LIU Wen-Jie, ZHANG Hua, QIU Yan-Ting, DONG Yi-Ming, NING Yang. Direct Detection of Di-2-ethylhexy Phthalate in Environmental Water Sample Based on Extractive Electrospray Ionization Mass Spectrometry[J]. Chinese Journal of Analytical Chemistry, ;2018, 46(6): 883-888. doi: 10.11895/j.issn.0253-3820.171525 shu

Direct Detection of Di-2-ethylhexy Phthalate in Environmental Water Sample Based on Extractive Electrospray Ionization Mass Spectrometry

1.
College of Environment and Resources, Key Lab of Groundwater Resources and Environment Ministry of Education, Jilin University, Changchun 130012, China;
2.
College of Chemistry, State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, Jilin University, Changchun 130012, China

Received Date: 21 December 2017
Revised Date: 24 March 2018

Fund Project: This work was supported by the National Natural Science Foundation of China (Nos. 21404047, 21307040) and the 111 Project (No. B16020).

The environmental organic pollutant of di-2-ethylhexy phthalate (DEHP) was analyzed by extractive electrospray ionization mass spectrometry (EESI-MS). Effect of some important experimental conditions were investigated systematically, including the electrospray voltage, temperature of ion-transport tube, sample injection rate and extractant composition. Under the optimal conditions, a method for rapid detection of DEHP in water sample was established. DEHP levels in different samples with complex matrixes were measured, including landfill leachate, urban sewage and lake water. The results showed that DEHP in water samples could be ionized by EESI source and obtained the molecule ion (m/z 391.28) at the positive detection mode, and then CID experiment were performed to obtain the secondary fragment ions m/z 279.26, 167.12 and 149.11. The intensity of characteristic peak m/z 149.11 possessed a good linearity with the concentration of DEHP in the range of 5-1000 μg/L with the correlation coefficient of R²=0.9991, and the detection limit (LOD) of 0.21 μg/L. The recoveries of DEHP at three spiked levels (8, 80, 400 μg/L) were 96.2%-111.2%, with RSDs of 5.6%-11.8%. With the developed EESI-MS method, the concentrations of DEHP in landfill leachate, urban sewage and Yan lake water were 556.5, 275.3 and 37.8 μg/L, respectively. The EESI-MS method possessed many advantages such as no requirement of sample pretreatment, fast analysis speed (about 3 min per sample), simple operation and high sensitivity, thus providing a new mass spectrometric method for rapid detection of phthalate esters.
- Di-2-ethylhexyl phthalate,
- Extractive electrospray ionization,
- Mass spectrometry,
- Environmental water sample
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沈阳化工大学材料科学与工程学院沈阳 110142