H2S measurement by PFPD

[civany]

Good afternoon,

We are in the process of calibrating a PFPD for H2S measurement in natural gas.

When injecting a 25 ppm H2S in air standard we are seeing a "peak" at a retention time where H2S is expected. However, we are not seeing a sharp peak but a rounded low peak with extended tailing (I hope I have described that well enough to understand).

Are there any suggestions as to what could be causing this?

Thanks.

[chromatographer1]

Metal exposed at the injector or elsewhere in the flow path of the injected analyte,

A column what is not inert to strongly acidic analytes like H2S

Rod

[chromatographer1]

Metal exposed at the injector or elsewhere in the flow path of the injected analyte,

A column that is not inert to strongly acidic analytes like H2S

Rod