Peak tailing in GC

Hi koti.vanga,

Peak tiling can happened by many reasons

1- Contaminated  injector liner this solved by clean or replace injector liner,Contaminated column Bake out the column

Cut 4 inches off the end of the column.

2-poor installed column and liner ,and this confirm by injecting inert peak(methane)  if it tails, column is not properly installed. Reinstall liner and column.

3-Split ratio is too low Increase split ratio to at least 20/1.

so we need more information like inlet,split ratio,.......is Mr.James referred.

Best regards

Dheya

Hi koti.vanga,

Do you have an example you could show us? Peak tailing can be an inlet problem where maintenance needs to be completed. We need a bit more information such as the GC Model, inlet type , detetcor etc.

Regards

James 

Hi

thank you

GC model : Auto Sampler: 7890B, 7693A;

Capillary column inlet

FID detector

split ratio 200

Best regards

koti

Hi koti.vanga,

can you attach  image to this problem ,do you inject by auto sampler or LSV ?

The split ratio 200 high so check for leaks ,if not leaks in injector,column connection  

try reinstall column in injector and detector side because the most peak tiling problem cause by leaks and bad instillation for column.

see below links for instillation 

 https://www.agilent.com/cs/library/Support/Documents/F03041.pdf 

https://www.agilent.com/cs/library/Support/Documents/F03034.pdf 

Dheya  

I didn't see a column flow listed. If the total flow on the inlet is 200 ml or above, its recommended for a split/splitless inlet to have a cross cut gold seal rather than the regular seal. The parameters supplied do not mention inlet type.

Cross cut gold seal for spli/splitless inlet 5182-9652 . 

Liner information would be helpful as well.

Regards 

James 

It could also be a bad column or it got trashed by a bad sample.  200 is very high, money right out the vent.