It is difficult to rapidly and on-line detect trace volatile organic compounds for miniature massspectrometry due to its limited sampling volume at slow pumping speed. In this paper, we developed anew radiofrequency f...It is difficult to rapidly and on-line detect trace volatile organic compounds for miniature massspectrometry due to its limited sampling volume at slow pumping speed. In this paper, we developed anew radiofrequency field enhanced chemical ionization source （RF-ECI） with vacuum ultraviolet （VUV）lamp by coupling radiofrequency electric field and direct-current field together. The experiment resultsshowed that the sensitivity of benzene, toluene, hydrogen sulfide and other compounds increased by 2-3orders of magnitude under the introduction of RF-ECI comparing to traditional single photon ionization（SPI）. At the same time, the reagent ion of O2＋ realized the charge transfer reaction chemical ionization,and the RF-ECI effectively expanded the detection range of the VUV lamp based SPI. The VUV lamp hasinherent advantages in the on-site analytical instrument for its small size and low power consumption,and the VUV lamp based RF-ECI miniature time-of-flight mass spectrometer （TOFMS） has a limit-of-detection for H2S as low as 0.0571 mg/m3, and it is expected to be used widely in the field of on-site rapidanalvsis.展开更多
在自行设计的微波激发无极紫外灯光氧化反应器和内电解反应器联用体系中,以次氯酸钠为氧化剂,对质量浓度为0.4g/L的C.I.Reactive Blue 194(活性深兰M-2GE)染料废水进行处理。结果表明,氧化剂的投加量为4.6 g/L、微波紫外光反应器中反应...在自行设计的微波激发无极紫外灯光氧化反应器和内电解反应器联用体系中,以次氯酸钠为氧化剂,对质量浓度为0.4g/L的C.I.Reactive Blue 194(活性深兰M-2GE)染料废水进行处理。结果表明,氧化剂的投加量为4.6 g/L、微波紫外光反应器中反应时间30min、铁炭床微电解反应总时间50min时,脱色率、CODCr去除率可分别达到98%、75%的处理效果。展开更多
基金financially supported by the National Natural Science Foundation of China(Nos.21375129 and 21675155)
文摘It is difficult to rapidly and on-line detect trace volatile organic compounds for miniature massspectrometry due to its limited sampling volume at slow pumping speed. In this paper, we developed anew radiofrequency field enhanced chemical ionization source （RF-ECI） with vacuum ultraviolet （VUV）lamp by coupling radiofrequency electric field and direct-current field together. The experiment resultsshowed that the sensitivity of benzene, toluene, hydrogen sulfide and other compounds increased by 2-3orders of magnitude under the introduction of RF-ECI comparing to traditional single photon ionization（SPI）. At the same time, the reagent ion of O2＋ realized the charge transfer reaction chemical ionization,and the RF-ECI effectively expanded the detection range of the VUV lamp based SPI. The VUV lamp hasinherent advantages in the on-site analytical instrument for its small size and low power consumption,and the VUV lamp based RF-ECI miniature time-of-flight mass spectrometer （TOFMS） has a limit-of-detection for H2S as low as 0.0571 mg/m3, and it is expected to be used widely in the field of on-site rapidanalvsis.
文摘在自行设计的微波激发无极紫外灯光氧化反应器和内电解反应器联用体系中,以次氯酸钠为氧化剂,对质量浓度为0.4g/L的C.I.Reactive Blue 194(活性深兰M-2GE)染料废水进行处理。结果表明,氧化剂的投加量为4.6 g/L、微波紫外光反应器中反应时间30min、铁炭床微电解反应总时间50min时,脱色率、CODCr去除率可分别达到98%、75%的处理效果。
