单电极介质阻挡放电离子源的消电子技术研究
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摘要
基于电场绝缘屏蔽技术的单电极介质阻挡放电离子源(DBDI),具有放电均匀、稳定、离子化能量高等优点,可实现对更大极性范围样品的快速检测。较高的离子化能量也增大了质谱图的背景噪声水平,对部分弱极性、低沸点样品的检测信噪比不高。本研究发展了基于单电极DBDI体系的外置电极消电子技术,探讨了外置针电极和外置金属网的消电子机理及其检测效果。结果表明,外置金属网消电子技术显著提高了部分弱极性样品的检测信噪比,异丙威、全氟辛酸、苏丹红Ⅲ的信噪比提升了5~6倍。基于该技术测定辣椒粉中苏丹红Ⅲ,回收率为83.7%~94.6%,相对标准偏差(RSD)为5.6%~9.0%,检出限为23 mg/kg,满足辣椒粉中苏丹红Ⅲ添加剂检测分析的要求。外置金属网消电子技术进一步提高了单电极DBDI对弱极性、低沸点、复杂样品的检测能力。
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 Sudan Ⅲ was 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.
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 Sudan Ⅲ was 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.
引文
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24 Li Z,Zhang Y W,Zhang Y D,Liu H W.Anal.Methods,2014,7(1):86-90
2 Takats Z,Wiseman J M,Cooks R G.J.Mass Spectrom.,2005,40:1261-1275
3 Cooks R G,Ouyang Z,Takats Z,Wiseman J M.Science,2006,311:1566-1570
4 Mirabelli M F,Wolf J C,Zenobi R.Anal.Bioanal.Chem.,2016,408(13):3425-3434
5 Gilbert-López B,Geltenpoth H,Meyer C,Michels A,Hayen H,Molina-Díaz A,García-Reyes J F,Franzke J.Rapid Commun.Mass Spectrom.,2013,27(3):419-429
6 Saha S,Mandal M K,Nonami H,Hiraoka K.Ana.Chim.Acta,2014,839:1-7
7 Klute F D,Michels A,Schütz A,Vadla C,Horvatic V,Franzke J.Anal.Chem.,2016,88(9):4701-4705
8 Zhan X,Zhao Z,Yuan X,Wang Q,Li D,Xie H,Li X,Zhou M,Duan Y.Anal.Chem.,2013,85:4512-4519
9 Na N,Zhang C,Zhao M,Zhang S,Yang C,Fang X,Zhang X.J.Mass Spectrom.,2007,42:1079-1085
10 Yang S,Ding J,Zheng J,Hu B,Li J,Chen H,Zhou Z,Qiao X.Anal.Chem.,2009,81:2426-2436
11 HONG Huan-Huan,ZHAO Peng,NING Lu-Sheng,WEN Lu-Hong,XU Tie-Feng.Chinese J.Anal.Chem.,2017,45(10):1529-1534洪欢欢,赵鹏,宁录胜,闻路红,徐铁峰.分析化学,2017,45(10):1529-1534
12 Chen L C,Hashimoto Y,Furuya H,Takekawa K,Kubota T,Hiraoka K.Rapid Commun.Mass Spectrom.,2009,23:333-339
13 Dumlao M C,Xiao D,Zhang D,Fletcher J,Donald W A.J.Am.Soc.Mass Spectrom.,2017,28:575
14 Habib A,Ninomiya S,Chen L C,Usmanov D T,Hiraoka K.J.Am.Soc.Mass Spectrom.,2014,25:1177-1180
15 Na N,Zhao M,Zhang S,Yang C,Zhang X.J.Am.Soc.Mass Spectrom.,2007,18(10):1859-1862
16 Na N,Zhang C,Zhao M,Zhang S,Yang C,Fang X,Zhang X.J.Mass Spectrom.,2007,42(8):1079-1085
17 SHAO Kang,HAN Wen-Wen,ZHAO Xue,WANG Shu-Wei,LONG Zi,NA Na.Chinese J.Anal.Chem.,2017,45(6):862-867邵康,韩雯雯,赵雪,王舒炜,龙姿,那娜.分析化学,2017,45(6):862-867
18 NING Lu-Sheng,XU Ming,GUO Cheng-An,ZHAO Peng,WEN Lu-Hong,ZHANG Xin-Rong.Chinese J.Anal.Chem.,2016,44(2):252-257宁录胜,徐明,郭成安,赵鹏,闻路红,张新荣.分析化学,2016,44(2):252-257
19 ZHANG Jia-Ling,HUO Fei-Feng,ZHOU Zhi-Gui,BAI Yu,LIU Hu-Wei.Progress in Chemistry,2012,24(1):101-109张佳玲,霍飞凤,周志贵,白玉,刘虎威.化学进展,2012,24(1):101-109
20 Hiraoka K,Chen L C,Iwama T,Mandal M K,Ninomiya S,Suzuki H,Ariyada O,Furuya H,Takekawa K.J.Mass Spectrom.Soc.Japan,2010,58(6):215-220
21 JING Tao,DAI Ying,MA Xiao-Juan,HUANG Bai-Biao.Chinese Optic,2016,9(1):1-15荆涛,戴瑛,马晓娟,黄柏标.中国光学,2016,9(1):1-15
22 LIU Chong,WU Cheng-Bai,ZHANG Wen-Tao,LIANG Jun-Sheng,WANG Li-Ding.Optics and Precision Engineering,2008,16(3):459-466刘冲,吴成百,张文涛,梁军生,王立鼎.光学精密工程,2008,16(3):459-466
23 LIU Wei-Bo,DONG Li-Fang.Chinese Journal of Luminescence,2017,38(2):232-237刘伟波,董丽芳.发光学报,2017,38(2):232-237
24 Li Z,Zhang Y W,Zhang Y D,Liu H W.Anal.Methods,2014,7(1):86-90