Short name:
OHR-LIF

Full name:
OH Reactivity Laser Induced Fluorescence Instrument (Brune)

What is being measured:
Total OH Reactivity by flow tube kinetics (uses GTHOS)

Sampling Protocol:
Online

Manufacturer:
Custom

Model:
Custom

Instrument year :
None specified

Data recording software:
Inquire with PI

Data analysis software:
Inquire with PI

Raw data time resolution:
Inquire with PI

Analysis data averaging:
Inquire with PI

Detection limit:
Inquire with PI

Sensitivity to temperature (and correction method, if applicable): :
Inquire with PI

Sensitivity to relative humidity (and correction method, if applicable): :
Inquire with PI

Sampling method:
Direct sampling

Sample preparation method:
None

Sample residence time (chamber to instrument) (seconds):

Length of tubing (cm):

Instrument flow rate:
6 LPM from chamber (60 SLM total)

Tubing inner diameter:

Tubing material:

Chemical identification method:
Inquire with PI

Data analysis method:
Inquire with PI

Quantification method:
OH reactivity is a measurement of OH decay kinetics with and without OH-reactants.

Calibration method:
GTHOS calibration technique, see GTHOS instrument for OH

Calibration drift estimate:

Calibration schedule:

Uncertainty estimation method:
The uncertainty in the OH reactivity measurement consists of an absolute uncertainty and the uncertainty associated with the wall loss subtraction. The absolute uncertainty of OH reactivity measurement (2σ ) mainly depends on following factors: (1) uncertainty of the anemometer, which is 2% of reading from the manufacture specification for Model 8455-03 Air Velocity Transducer and 10% for the temperature and pressure correction; (2) uncertainty of the regression coefficients , which is 15% when the decay is less than 2 s−1, and 5% when the decay is about 6 s−1; (3) the statistical precision of the fluorescence signals, which are about 100 cts s−1 for 15 s at the furthest point, for an uncertainty of 4%; and (4) uncertainty of the measured position of the wand, which is less than 1%.

Known interferences:

Link to supplemental information:
Mao et al.: https://www.atmos-chem-phys.net/9/163/2009/acp-9-163-2009.pdf

Additional notes:

Measurement uncertainty:

Measurement units: