分析化学2018，Vol.46Issue(7)：1017-1024,8.DOI:10.11895/j.issn.0253-3820.181158
单电极介质阻挡放电离子源的消电子技术研究
Electron Elimination Method Based on Single Electrode Dielectric Barrier Discharge Ion Source
摘要
Abstract
Based on the electric field shielding and insulation technology, the single electrode dielectric barrier discharge ion source ( DBDI ) has the characteristics of uniform discharging, stability, and high ionization energy, and thus can be used to detect various samples with a large range of polarity. However, the ionization energy is too high to reduce the background signal noise, and thus affects the detection effectiveness to low polarity and low boiling point samples. To enhance the detection effectiveness to these samples, a method of eliminating electrons of single electrode DBDI by using external metal electrodes was developed in this study. Then, the single electrode DBDI was improved by an external needle electrode and an external metal net, respectively. The mechanism of those external metal electrodes was discussed, and the experimental studies were carried out. The results showed that the external metal net technology had an advantage in improving signal to noise ratio ( SNR ) , and the enhancement of SNR for the detection of isoprocarb, perfluorooctanoic acid and SudanⅢwas about 5-6 times. Based on the technology, a method for determination of Sudan Ⅲ in chili powder was developed. The recoveries, RSD and LOD were 83. 7%-94. 6% , 5. 6%-9. 0% and 23 mg/kg, respectively. The external metal electrode technique has broadened the detection range of single electrode DBDI to the field of low polarity, low boiling point and complex samples.关键词
单电极介质阻挡放电离子源/消电子/外置金属网/信噪比/弱极性Key words
Single electrode dielectric barrier discharge ion source/Electron elimination/External metal net/Signal-to-noise ratio/Low polarity引用本文复制引用
胡舜迪,刘其强,赵鹏,洪欢欢,史振志,周镇宇,闻路红..单电极介质阻挡放电离子源的消电子技术研究[J].分析化学,2018,46(7):1017-1024,8.基金项目
本文系国家重大科学仪器设备开发专项(No. 2016YFF0100300)、国家重大科研仪器研制项目(No. 21727813)、国家自然科学基金项目(Nos. 21727813, 11602116, 51605231)、宁波市自然科学基金项目(No. 2017A610164)和宁波大学王宽诚幸福基金资助 This work was supported by the National Key Scientific Instrument and Equipment Development Project (No. 2016YFF0100300), the National Natural Science Foundation of China ( Nos. 21727813, 11602116, 51605231 ), the Natural Science Foundation of Ningbo City (No. 2017A610164) and the K. C. Wong Magna Fund in Ningbo University, China. （No. 2016YFF0100300）
