Atmospheric Chemistry Lab
Prof. Renyi Zhang's Atmospheric Chemistry Laboratory occupies approximately 2000 square feet in the Department of Atmospheric Sciences at Texas A&M University. The lab is equipped with state-of-art infrastructure, including a fume hood and bench tops, for conducting atmospheric chemistry experiments. Major instruments include three Ion Drift-Chemical Ionization Mass Spectrometer (ID-CIMS) for measurements of gaseous inorganic and organic compounds, an Atmospheric Pressure - ID-CIMS for measurements of gas-phase sulfuric acid, a compact Proton Transfer Reaction Mass Spectrometer (PTR-MS) for measurements of volatile organic compounds, an Ion Drift-Chemical Ionization Tandem Mass Spectrometer equipped with electrostatic precipitation - Thermal Desorption System (TD-ID-CIMS/MS) for chemical analysis of aerosol nanoparticles, and a nano-Tandem Differential Mobility Analyzer (nano-TDMA) for investigation of the nanoparticles growth. A Particle Size Magnifier (PSM) for growing the nucleating clusters and other equipment required for PSM calibration, including an Electro-Spray Ionization (ESI) source of charged clusters and an aerosol electrometer for detection of charged clusters has been constructed and tested in the Zhang's lab.
The Center for Atmospheric Chemistry and the Environment
(CACE) at Texas A&M University owns a well-equipped, climate-controlled air sampling research trailer. Permanently installed in this 7.5 m long trailer are Thermo Environmental CO, NOx, NOy, O3, and SO2 sensors, which are linked to a central computer that continuously records instrument status and measured concentrations. Adjacent to the trailer is a 10 m tower from which the gas and aerosol flows are sampled, and on which a variety of meteorological sensors are mounted. To minimize sample losses, Teflon tubing is used for all of the gas sensor sample lines, while a combination of ¾” stainless steel and ¾” TSI flexible conductive tubing is used for the aerosol sample line. The trailer has ample space and power for additional project-specific instruments.
The Atmospheric Aerosol Research Group at Texas A&M University is equipped with an extensive array of field-deployable research instrumentation. In recent years, this lab has developed a range of novel ground and aircraft- based instruments, many of which are unique. The current list of field instrumentation includes two ground-based and one aircraft-based high flow DMA/TDMAs, an ambient hydration state TDMA, an aircraft-based optical instrument that measures total scattering, radar backscattering, and absorption by aerosols, a TSI Aerodynamic Particle Sizer, a Giant and Ultragiant Particle Spectrometer, and a CCN separator. In the coming months, we will acquire a second TSI Aerodynamic Particle Sizer and a DMT CCN counter, and will construct three additional ground-based TDMAs and one additional aircraft-based DMA system. Additionally, the 1300 square foot lab our group occupies is equipped with a fume hood, an optics table, a nano- pure water purifier, and distributed vacuum, compressed air, and exhaust systems. Calibration equipment includes an atomizer for particle generation, a bubble flow meter for flow rate calibration, and a fabricated relative humidity calibration unit. More information about our laboratory facilities is available at Centers and Facilities.