Improvement of vacuum nebulizing interface for direct coupling micro-liquid chromatograph with mass spectrometer and some applications to polar natural organic compounds

1982 ◽  
Vol 311 (7) ◽  
pp. 674-680 ◽  
Author(s):  
H. Yoshida ◽  
K. Matsumoto ◽  
K. Itoh ◽  
S. Tsuge ◽  
Y. Hirata ◽  
...  
Keyword(s):  
Organic Compounds ◽  
Mass Spectrometer ◽  
Direct Coupling ◽  
Liquid Chromatograph ◽  
Natural Organic Compounds

Vacuum nebulizing interface for direct coupling of micro-liquid chromatograph and mass spectrometer

1979 ◽  
Vol 51 (1) ◽  
pp. 166-169 ◽  
Author(s):  
Shin. Tsuge ◽  
Yukio. Hirata ◽  
Tsugio. Takeuchi
Keyword(s):  
Mass Spectrometer ◽  
Direct Coupling ◽  
Liquid Chromatograph

Organics Analyzer for Sampling Icy Surfaces: A liquid chromatograph-mass spectrometer for future in situ small body missions

2013 ◽  
Author(s):  
Stephanie A. Getty ◽  
Jason P. Dworkin ◽  
Daniel P. Glavin ◽  
Mildred Martin ◽  
Yun Zheng ◽  
...  
Keyword(s):  
Mass Spectrometer ◽  
Small Body ◽  
Liquid Chromatograph

scholarly journals Characteristics of marine shipping emissions at berth: profiles for particulate matter and volatile organic compounds

2018 ◽  
Vol 18 (13) ◽  
pp. 9527-9545 ◽  
Author(s):  
Qian Xiao ◽  
Mei Li ◽  
Huan Liu ◽  
Mingliang Fu ◽  
Fanyuan Deng ◽  
...  
Keyword(s):  
Volatile Organic Compounds ◽  
Organic Compounds ◽  
Mass Spectrometer ◽  
Elemental Carbon ◽  
Atmospheric Stability ◽  
Diesel Oil ◽  
Human Populations ◽  
Volatile Organic ◽  
Before And After ◽  
The Impact

Abstract. Emissions from ships at berth play an important role regarding the exposure of high density human populations to atmospheric pollutants in port areas; however, these emissions are not well understood. In this study, volatile organic compounds (VOCs) and particle emissions from 20 container ships at berth were sampled and analyzed during the “fuel switch” period at Jingtang Port in Hebei Province, China. VOCs and particles were analyzed using a gas chromatography-mass spectrometer (GC-MS) and a single particle aerosol mass spectrometer (SPAMS), respectively. VOC analysis showed that alkanes and aromatics, especially benzene, toluene and heavier compounds e.g., n-heptane, n-octane and n-nonane, dominated the total identified species. Secondary organic aerosol (SOA) yields and ozone (O3) forming potential were 0.017 ± 0.007 g SOA g−1 VOCs and 2.63 ± 0.37 g O3 g−1 VOCs, respectively. Both positive and negative ion mass spectra from individual ships were derived and the intensity of specific ions were quantified. Results showed that elemental carbon (35.74 %), elemental carbon–organic carbon mixtures (33.95 %) and Na-rich particles (21.12 %) were major classes, comprising 90.7 % of the particles observed. Particles from ship auxiliary engines were in the 0.2 to 2.5 µm size range, with a peak occurring at around 0.4 µm. The issue of using vanadium (V) as tracer element was examined, and it was found that V was not a proper tracer of ship emissions when using low sulfur content diesel oil. The average percentage of sulfate particles observed in shipping emissions before and after switching to marine diesel oil remained unchanged at 24 %. Under certain wind conditions, when berths were upwind of emission sources, the ratios before and after 1 January were 35 and 27 % respectively. The impact of atmospheric stability was discussed based on PM2.5 and primary pollutant (carbon monoxide) concentration. With a background of frequent haze episodes and complex mechanisms of particulate accumulation and secondary formation, the impact of atmospheric stability is believed to have been weak on the sulfate contribution from shipping emissions. The results from this study provide robust support for port area air quality assessment and source apportionment.

Sign in / Sign up

Export Citation Format

Share Document