System for δ13C-CO2 and xCO2 analysis of discrete gas samples by cavity ring-down spectroscopy

hello my name is staying Dickinson and I'm at the I stood by science of archery at Ghent University and today I'm going to demonstrate how to measure discrete guess samples on an isotopic laser absorption gas analyzer thank 1st let's have a look at our measurement setup we use in the carriage e 21 31 all I I stop acceded to guess analyzed we're largely aspect for supplying instrument with a stable reference baseline for measurements the gas that is connected to the laws of i one-eighth inch if the p cheating and and dispersing the achieving at to three-way valves were via lock fittings the 1st phallus fulfilling the gas bag of reference here while the 2nd is a sample and the point and finally we using an SGD 50 milliliter gas-tight surrender of fitting and push button thou for straight sample deliberate the principle of operation is as follows we start by taking a 5 to 10 minute measurement of

reference desk in order to provide a steady baseline against which a syringe samples will be distinguished after that's where I would introduce discrete samples which will thus showed as distinctive peaks in the DoDAF aid to standardize this method we developed a basic software script which

manages the sample input prices the takes a sample Bates extracts and analyzes the sample data and outputs a concise results while I will now demonstrate the method

info to be we've already started the carrier gas

analyzer which has been sampling ambient

labia for the past hour so now starts off with script which runs of them the

carrot coordinate application programs at the start of sample sequence there is the opportunity to

adjust various parameters so hero specify a sequence of 3 samples now

the reference in reading the state after the

reference measurement is done ready to run syringe samples understand take samples of Latvia the all I needed those connect the syringed Finland point when the system is ready the software will prominent open the valves

note the position of three-way valve bonnet dereferences supply must be stopped and the

analyzer then draw directly from the syringe

the samples then evacuated of the plunger collecting unassisted it is important that the syringes correctly lubricated so as the sample evacuation proceeds smoothly once a sample is finished the three-way valve must be immediately returned to its initial position so

as to resume reference air intake of minimal disruption is possible the software that

automatically extracts a sample data once

analyzer readings have completely returned to the reference composition this time for the next sample when analyze like the G 21

31 I you can generate expect to complete around 10 samples now now that are 3

samples have been measured whole upload Sample

Descriptors there are 3 separate fields

available for describing each sample and as you can see all measurement data for each sample thus uniquely coded so yeah and the result

society in CSV format meaning they can be easily imported into any data analysis software for further use thanks for

watching demonstration this method is described in further detail in article and Atmospheric Measurement Techniques