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Citation: WANG Shuang, WANG Zhe, HOU Ke-Yong, LI Hai-Yang. Thermal Desorption Low Temperature Plasma Ionization Mass Spectrometry for Rapid and Sensitive Detection of Pesticides in Broomcorn[J]. Chinese Journal of Analytical Chemistry, ;2017, 45(2): 175-182. doi: 10.11895/j.issn.0253-3820.160660 shu

Thermal Desorption Low Temperature Plasma Ionization Mass Spectrometry for Rapid and Sensitive Detection of Pesticides in Broomcorn

1.
Key Laboratory of Separation Science for Analytical Chemistry, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China;
2.
University of Chinese Academy of Sciences, Beijing 100049, China;
3.
Analysis and Test Center of Jing Brand Co., Ltd., Huangshi 344000, China

Received Date: 5 September 2016
Revised Date: 23 November 2016

Fund Project: This work was supported by the National Natural Science Foundation of China (No.21375129) and the National Major Scientific Instrunts and Equipments Special Project (No.2011YQ05006904)

A thermal desorption low temperature plasma (TD-LTP) ionization was developed for rapid and sensitive detection of pesticides by direct mass spectrometry. The thermal desorption sampler was added in fount of the plasma generator. The sample was desorbed in the thermal desorption sampler firstly, and then the gas molecules were transported to the plasma generator by the carrier gas to be ionized. The utilization of thermal desorption sampler helps to shift the interaction of the gas phase plasma with the sample form gas-solid or gas-liquid to gas-gas, which increases the sensitivity and stability especially for non-volatile sample (e.g. pesticides) greatly compared with the traditional LTP ionization source. Under the optimal parameters of the thermal desorption LTP ionization source, the characteristic ions of 12 kinds of pesticides were investigated. Then the thermal desorption LTP ionization source was connected with the commercial ACQUITY TQD mass spectrometer to evaluate the pesticide residue level in broomcorn.
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1.
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