热解析低温等离子体电离源用于糯高粱中农药残留的快速筛查

引用本文: 王爽, 王喆, 侯可勇, 李海洋. 热解析低温等离子体电离源用于糯高粱中农药残留的快速筛查[J]. 分析化学, 2017, 45(2): 175-182. doi: 10.11895/j.issn.0253-3820.160660 shu

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

热解析低温等离子体电离源用于糯高粱中农药残留的快速筛查

王爽 ^1,2, ,
王喆 ^3, ,
侯可勇 ^1, ,
李海洋 ^1,

1.
中国科学院分离分析化学重点实验室, 中国科学院大连化学物理研究所, 大连 116023;
2.
中国科学院大学北京 100039;
3.
劲牌有限公司分析测试中心黄石 435000
基金项目:
本文系国家重大仪器专项（No.2011YQ05006904）和国家自然科学基金（No.21375129）和国家科技支撑计划（No.2013BAK14B04）资助项目

摘要: 本研究设计并搭建了一套热解析低温等离子体电离源（TD-LTP），与质谱联用实现了糯高粱中农药残留的快速和高灵敏检测。TD-LTP由热解析装置和低温等离子体放电源两部分组成，农药残留样品首先在热解析进样器内汽化，再由载气载带进入等离子体区域被电离。热解析进样器使LTP产生的气相等离子体与样品之间的气-固或气-液相互作用转变为气-气相互作用，大大提高了难挥发样品（如农药）的电离效率；电离源与质谱进样口之间采用同轴连接，提高了离子的利用率和传输效率。与传统的LTP电离源相比，TD-LTP电离源的灵敏度提高了8倍以上，稳定性提高了4倍。本研究对热解析低温等离子体电离源的各参数进行了优化，并与自制的矩形离子阱质谱相结合，研究了12种农药在该电离源下的特征离子。最后，将此电离源与商品化的三重四极杆质谱仪联用，对糯高粱样品中的12种农药残留进行了快速筛查，结果表明，本方法灵敏度高，可以满足食品安全国家标准规定的谷物中农药残留最大限量检测要求。

关键词:

English

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: 05 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)

Abstract: 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.

Key words:

Rapid detection of pesticide residues
/ Thermal desorption sample introduction
/ Low temperature plasma ion source
/ Rectilinear ion trap
/ Triple quadrupole mass spectrometry

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热解析低温等离子体电离源用于糯高粱中农药残留的快速筛查

English

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

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中国化学会秘书处

热解析低温等离子体电离源用于糯高粱中农药残留的快速筛查

English

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

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CCS Chemistry：工作高效不疲劳，只须让催化剂动起来

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