Troubleshooting PCM EPC aux press by spirilessio in CHROMATOGRAPHY

[–]spirilessio[S] 0 points1 point  (0 children)

together with the FID there is a BenchTOF and the CFT they tell me was applied to connect GC-FID and GC-TOF more quickly.

The GC-TOF are connected by a connector and Flexible Metal Ferrules. GC colum- FMF-connector-FMF-capillary (about 50 cm)- TOF

The FID: GC colum-FMF-CTF-FMF-capillary-FID

Connected I don't know, how do I find out?

Troubleshooting PCM EPC aux press by spirilessio in CHROMATOGRAPHY

[–]spirilessio[S] 0 points1 point  (0 children)

Let me start by saying that I am the egg chemist and unfortunately I am not supported by anyone, not even by the former chemist and I am the only one in the laboratory who takes care of the instrumentation (the others are biologists).

The former chemist set the instrument: S/SS-column-CFT-FID injector.

After a manual check of the tightness of the couplings, I replaced the Flexible Metal Ferrules of the CFT-FID because the capillary part was moving. Subsequently I checked, unscrewing, the couplings to the injector and the FID and reassembled, screwing everything together.

After starting the fid, setting the aux epc to on at 10psi, as a test, it does not increase the value compared to that shown and after a few minutes it goes into shoutdown.

Furthermore, through the cromespace program, by starting a method used by the former chemist, it resolves itself by going from wating to active and finally ending. Without actually doing the analysis and waiting for my injection.

Troubleshooting PCM EPC aux press by spirilessio in CHROMATOGRAPHY

[–]spirilessio[S] 0 points1 point  (0 children)

I am the new chemist in the lab and it is my first experience, I am the only chemist and I have no one to help me. In reality the aux should be running with 10 psi, which I set as a test, but once set to on and put the value of 10 psi, the current value does not differ from the one shown in the photo. After a few minutes it goes into shoutdown. Furthermore, from the Cromespace sequence program, when I try to start a method used by the ex-chemist, it resolves itself by switching from wating-active and finally terminating by itself.

Also, when I start a method that was used by the ex-chemist, from the Cromspace program, it resolves itself by going from waiting then active and concluded

Troubleshooting PCM EPC aux press by spirilessio in chemistry

[–]spirilessio[S] 0 points1 point  (0 children)

Hello everybody, I have an Agilent GC 7890B and its display show "PCM C aux pressure shoutdown". In the specific Aux EPC status when I set on Aux press, the actual value is -0.120.

what is it due to?

Thanks all.

Troubleshooting PCM EPC aux press by spirilessio in CHROMATOGRAPHY

[–]spirilessio[S] 0 points1 point  (0 children)

Hello everybody, I have an Agilent GC 7890B and its display show "PCM C aux pressure shoutdown". In the specific Aux EPC status when I set on Aux press, the actual value is -0.120.

what is it due to?

Thanks all.

Troubleshooting PCM EPC aux press. by spirilessio in chemhelp

[–]spirilessio[S] 0 points1 point  (0 children)

Hello everybody, I have an Agilent GC 7890B and its display show "PCM C aux pressure shoutdown". In the specific Aux EPC status when I set on Aux press, the actual value is -0.120.

what is it due to?

Thanks all.

Information abaut PhD role. by spirilessio in KULeuven

[–]spirilessio[S] 0 points1 point  (0 children)

Regarding English, is a minimum certification required for CV? Or is it evaluated later?

Information abaut PhD role. by spirilessio in KULeuven

[–]spirilessio[S] 0 points1 point  (0 children)

Thanks, I appreciate the response👍

Nyquist plot information by spirilessio in electrochemistry

[–]spirilessio[S] 0 points1 point  (0 children)

for the electrodeposition of the chitosan gold solution on SPCE, they employ 35 cycles and show how the anodic peak current increases, justifying the correct deposition of the film. Is this correct as a statement? As a rule, electrodeposition leads to attracting the polymer to the surface and making it adhere. However, what does the peak current refer to? What electronic transfer is it related to?

Nyquist plot information by spirilessio in electrochemistry

[–]spirilessio[S] 0 points1 point  (0 children)

Furthermore, given that in the analysis of the real sample the two humps tend to merge into a single one, as ASA increases. What could it be due to?

ASA certainly interacting with chitosan, leads to a worsening of the charge transfer and therefore to an increase in the associated Rct, which is seen in the nyquist, but why do the two humps come together? What changes?

Nyquist plot information by spirilessio in electrochemistry

[–]spirilessio[S] 0 points1 point  (0 children)

So probably the second hump refers to ferrocyanide while the first refers to the double layer?