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

发布时间：2018-07-03 10:02

本文选题：农药残留快速检测 + 热解析进样　；参考：《分析化学》2017年02期

【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。
[Abstract]:In this study, a set of thermoanalytic low-temperature plasma ionization source (TD-LTP) was designed and constructed. The rapid and highly sensitive detection of pesticide residues in waxy sorghum was realized by means of mass spectrometry. TD-LTP was composed of a thermal analysis device and a low-temperature plasma discharge power source. The pesticide residue samples were vaporized in the thermal desorption sampler and then ionized into the plasma region by the carrier band. The gas-solid or gas-liquid interaction between the sample and the vapor plasma produced by the LTP is transformed into gas-gas interaction by the thermal desorption sampler, which greatly improves the ionization efficiency of the difficult volatile sample (such as pesticide). Coaxial connection between ionization source and mass spectrometer injector improves ion utilization and transport efficiency. Compared with the conventional LTP ionization source, the sensitivity of TD-LTP ionization source is increased by more than 8 times, and the stability is increased by 4 times. In this paper, the parameters of the thermal analytical low temperature plasma ionization source are optimized, and the characteristic ions of 12 pesticides under the ionization source are studied by combining with the self-made rectangular ion trap mass spectrometry. Finally, the 12 pesticide residues in waxy sorghum samples were quickly screened by using this ionization source and commercial triple quadrupole mass spectrometer. The results showed that the method was highly sensitive. It can meet the requirement of maximum detection limit of pesticide residue in cereals stipulated by the national standard of food safety.
【作者单位】：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;中国科学院大学;劲牌有限公司分析测试中心;
【基金】：国家重大仪器专项(No.2011YQ05006904) 国家自然科学基金(No.21375129) 国家科技支撑计划(No.2013BAK14B04)资助项目~~
【分类号】：TQ450.263;O657

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