---
instrument_id: '390'
data_file_original_name: 'EPA2269A_GC.csv'
skip_headers: '1'
charts: ''
headers:
    - 'Local_Time_PST'
    - 'Experimental_Time_min'
    - 'm-Xylene_Concentration_ppm'
dataset_id: '2394'
experiment_link: 'https://icarus.ucdavis.edu/chambers/539/experiments/281'
experiment_set_link: 'https://icarus.ucdavis.edu/chambers/539/experimentSets/190'
chamber_link: 'https://icarus.ucdavis.edu/chambers/539'
dataset_created_at: '2021-08-24 15:47:16'
dataset_updated_at: '2021-08-24 15:47:16'
instrument_link: 'https://icarus.ucdavis.edu/chambers/539/instruments/390'
instrument:
    id: '390'
    short_name: 'GC-FID'
    full_name: 'Gas Chromatography - Flame Ionization Detector'
    manufacturer: 'Agilent'
    model: '6890N'
    year: '2005'
    data_recording_software: 'Agilent ChemStation'
    data_analysis_software: 'Custom Excel Program'
    raw_data_time_resolution: '1s'
    analysis_data_averaging: '10~20 min'
    detection_limit: '0.1 ppb'
    quantification_limit: ''
    sensitivity_to_temperature: 'N/A'
    sensitivity_to_relative_humidity: 'N/A'
    sampling_method: 'Direct gas sampling'
    sample_preparation_method: 'Filter particle contents before sampling'
    sample_residence_time_in_seconds: ''
    length_of_tubing_in_cm: ''
    flow_rate: ''
    tubing_material: 'FEP Teflon'
    chemical_identification_method: 'Retention time of hydrocarbons in a known column is used to pre-calibration and different VOCs can be assigned to specific peaks.'
    data_analysis_method: 'The built-in ChemStation program converts the raw signal to formatted data in scan reports, then the data is extracted by a custom Excel script.'
    quantification_method: "Integration of ChemStation peaks multiplied by a response\r\nfactor determined from calibration to output ppb data"
    calibration_method: "Performance calibration: sample known concentration of Hexane gas and compare the result to the pre-calibration data to make sure the instrument is in a good working state. THIS IS DONE BEFORE EACH EXPERIMENT STARTS.\r\nHydrocarbon calibration: calibration with three or more dilutions of known hydrocarbon concentrations in FEP Teflon bags (pillow bags). THIS IS DONE ANNUALLY."
    calibration_drift_estimate: 'Low (on the order of weeks)'
    calibration_schedule: 'Annually'
    uncertainty_estimation_method: 'N/A'
    known_interferences: 'Column backgrounds'
    link_to_supplemental_information: 'N/A'
    additional_notes: 'N/A'
    organization_id: '547'
    created_at: '2020-02-25T09:57:16.000000Z'
    updated_at: '2021-08-24T23:05:33.000000Z'
    column_descriptors: "(b) Experimental_Time = relative time, t=0 is defined as the start of the reaction (dark) or light given time (BL/Arc);\r\n(c) VOC_Concentration = the specific VOC concentration during an experiment;\r\n(d) Tracer_Concentration = the specific tracer concentration during an experiment."
    sampling_protocol: 'Online'
    skip_headers: '1'
    tubing_inner_diameter: '1/4'''' OD; 0.152'''' ID'
    what_is_measured: 'Hydrocarbon Concentrations'
    measurement_uncertainty: '(a) Local_Time (N/A); (b) Experimental_Time (N/A); (c) VOC_Concentration (+/- ?%); (d) Tracer_Concentration (+/- ?%)'
    measurement_units: '(a) Local_Time (N/A); (b) Experimental_Time (min); (c) VOC_Concentration (ppm); (d) Tracer_Concentration (ppm)'

---
Local_Time_PST,Experimental_Time_min,m-Xylene_Concentration_ppm
10/26/2016 9:26,-45,0.045781908
10/26/2016 10:08,-2,0.164369772
10/26/2016 10:50,40,0.147972645
10/26/2016 11:32,82,0.141299188
10/26/2016 12:14,124,0.132619959
10/26/2016 12:56,166,0.126058057
10/26/2016 13:38,208,0.120062716
10/26/2016 14:21,250,0.11523467
10/26/2016 15:03,292,0.110730619
10/26/2016 15:44,334,0.107110623
10/26/2016 16:26,376,0.103722361
