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SOP for Gas Chromatography Headspace System (Agilent-6797A)


Purpose: 
To develop the standard Operation procedure for GC-HS; Agilent 6797A and its compliance with the provision of Good laboratory practice regulations. 

Scope: 
Describes the finest details of the steps to be followed for simplest and precise handling of the machine and analytical technique 

Responsibilities: 
All the staff members carrying out operation of GC-HS; Agilent are responsible for strictly adhering to the procedure given. 

PEOPLE ALSO READ: SOP for Calibration of HPLC

Procedure: 

Cold Start of Gas Chromatography Headspace Instrument 
  • Before starting the Instrument, switch “On” the Air Conditioning of the room. 
  • Switch “On” all the gases (Nitrogen, Hydrogen & Zero air) by pushing the valve up on Gas Panel. 
  • Switch “On” the main UPS by long pressing start/stop button for 3 seconds. Before starting the GC Instrument, check the voltage stability (Voltage should be #233V). 
  • Switch “On” the GC instrument by pressing the button on the lower left corner. 
  • Similarly switch “On” the HS instrument by pressing the button on the lower left corner. 
  • Switch “On” the CPU of computer. 
  • As the system loads, from the desktop, select ‘GC’ from Administrator and GC. 

Preparation of Sample and Standards for Analysis 

Preparation of Standard 
  • From the standard GC grade analyte (99.95% GC grade), pipette 1ml and dilute the analyte in 100ml Ultra-pure water. 
  • Pipette out serial dilutions of 2000µl, 1000µl, 500µl, 250µl, 100µl, from stock solution of 1ml/100ml and dilute in 10ml of Ultra-pure water. 

Preparation of Internal Standard 
  • From the standard GC grade analyte (n-propanol), pipette 300µl and dilute the analyte in 100ml distilled water. 
  • Take 90µl of internal standard in the vial along with Standard and Sample if required.  

Sample Preparation 
  • In a clean, dry 20 ml HS vial take 1000µl/1ml of liquid analyte. 
  • If required as per analytical conditions, add 90µl of Internal Standard (n-propanol). 
  • Seal the mouth of vial using fresh PTFE septa and metallic crimp. 
  • Shake the vial slowly to mix sample and standard. 

Creating New Method for analysis 

Creating New Method 
  • On the Desktop, Double click on “Instrument1 online” icon; Method and Run Control screen will appear. 2. From the Menu bar click on “Method”, from the drop-down list select “New Method”. 
Creating Calibration of a Method 
  • Successively run samples of serial dilutions; 2000µl, 1000µl, 500µl, 250µl, 100µl in a sequence. 
  • Double click on “Instrument 1 offline” icon on desktop; Data analysis screen will appear. 
  • From the Menu bar click on “Method”, from the drop-down list select “Load Method”. From the list, select the method on which calibration is to be drawn.  
  • Select the graph of maximum concentration and load. 
  • On the “Menu bar” click on “Calibration”, from the drop-down list select “New Calibration Table”. 
  • “Calibrate: Instrument 1, New Calibration Table” window will appear, click on “OK”. 
  • All the peaks appear highlighted and table appears with RT and area. 
  • For every peak specify “Name” and “Amount”. 
  • For next dilution, from the “Menu bar” click on “Calibration”, from the dropdown list select “Add Level”. 
  • Specify only amount. After all concentrations have been labelled, click on “OK”. 
  • From the Menu bar click on “Method”, from the drop-down list select “Save Method”. 

PEOPLE ALSO READ: SOP for Operation of HPLC

Operation of Gas-Chromatography Headspace System 

  • Double click on“Instrument 1 online” icon on desktop; Method and Run Control screen will appear. 
  • From the Menu bar click on “Method”, from the drop-down list select “Load Method”. 
  • Run “CONDITIONING.M” method for at least 30 minutes before analyzing any sample. 
Analyzing Sample on GC-HS 
  • From the Menu bar click on “Method”, from the drop-down list select “Load Method”. From the list, select the method to be run (recent calibration method), and click ‘OK’. 
  • From the Menu bar click on “Sequence”, from the drop-down list select “Sequence Table”. 
  • On the Sequence Table: Instrument1 window, fill the following data of 
  1. Vial position where vial is kept 
  2. Sample Name ID of the sample to be analyzed 
  3. Method name Method on which sample is to be analyzed 
  4. Inj/vial Always “1” 
  5. Sample type Sample/ Standard 
  • For every next line, press down key. 
  • For every vial in the carousal, information should be filled up. 
  • Start sequence by clicking on “Run Sequence” or by pressing F6. 


Viewing Report of Sample Run 
  • On the Desktop, Double click on “Instrument 1 offline” icon on desktop; Data analysis screen will appear. 
  • From the Menu bar click on “Method”, from the drop-down list select “Load Method”. From the list, select the method to be loaded. 
  • From “Data Analysis” window, on the left side of screen, select the sequence run. 
  • Load the graph. 
  • From the Menu bar click on “Report”, click on “Print Report”. 
  • View report and print if required. 

Shut Down of Gas Chromatography Headspace Instrument 
  • On the Desktop, Double click on “Instrument1 offline” icon. From the Menu bar click on “Method”, from the drop-down list select “Load Method”. From the list, select “COOLING.M” method. 
  • As soon as Detector temperature of GC system and Oven temperature of Headspace system acquire temperature below 50°C, close the “ChemStation Online” or “Offline” windows. 
  • Switch “Off” the Instruments by pressing the button at the left down corner. Push the valve down for gases (Nitrogen, Hydrogen & Zero Air) from as panel. 
  • Press the “Start/Stop” button on the UPS, wait till the supply becomes zero. 
  • Switch “Off” the Air conditioners of the room. 


FITTING OF NEW COLUMN FOR ANALYSIS 

Fitting New Column in Oven Compartment 
  • Open the Oven compartment, ensuring that system is cooled and not in working condition. 
  • Open the nut of Inlet and Detector with a spanner. 
  • Insert the new column within the hanger in oven. Take one end of column to be fixed in Inlet end and other at Detector bend. 
  • To fix the Inlet end, cut the capillary column at about a length of 1mm with the help of cutter. Insert a septa and ferrule leaving a length of 4mm-6mm from tip. 
  • Insert the column tip in the Inlet end, leaving a distance of 1mm from top. Seal the attachment by screwing the nut using a spanner. 
  • Similarly, seal the detector end by cutting the capillary column at about a length of 1mm with the help of cutter. Insert a septa and ferrule leaving a length of 4mm-6mm from tip. 
  • Insert the end in detector, leaving a tip of 1mm and seal using spanner.

Configuring New Column

  • From the Menu bar click on “Method”, from the drop-down list select “Load Method”. From the list, select the method on which new column is to be configured. 
  • On the Menu bar click on “Edit Instrument Parameters”, Setup Method window will appear. 
  • Select 7690A (GC Sampler), different conditions of Auto sampler; Column; Oven; Inlet; Detector etc. will appear. 
  • Click on “Column”, column conditions will appear. 
  • Click on “Show All Columns”, list of columns appears. Select your column specifying the Identification and its length etc. click on “Install”, specify Inlet and Outlet. 
  • Click on “Calibrate Column”. 
  • Click on “OK” and save method changes. 
  • Run Conditioning method for 1 hour before running any sample on a new column. 
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