I am able to detect the same using a packed column but the resolution and minimum detection values are poor, I wonder if capillary column can improve on those factors. Can you also suggest the capillary column that may be useful for this purpose.
I would recommend that you use a polar column such as a wax column.
There are some wax columns that are specially treated to be used with acidic compounds, but I have not found them to be significantly different than a regular wax column. If you use a non-polar column, you will see significant tailing. The tailing will make it difficult to see low levels.
I am not sure if going to a capillary column will do much for your sensitivity since the detector is a concentration sensitive detector as opposed to mass sensitive.
Some things to consider are that acidic compounds can corrode the filaments, the volume of the detector should be designed for capillary flows, they tend to operate best at lower temp.
The short answer is no, not with any appreciable sensitivity. You can see percent levels, but you really can't do better than that. You need to change analytical techniques.
You can separate the formic on Gas-Chrom Q, but you can't fix the TCD issue.
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