INTERNAL ONLY – THIS ITEM IS DISCONTINUED

I think the difference is most likely related to the capillary lengths. Normally we don’t care too much about the difference in migration times because a 10% difference is normally considered acceptable. If one measures precisely the capillary length at 60.2cm you find with 50 runs a mean migration time (cv less 0.3%) listed below:

Cl 2.724min
N3 3.175min
Formic 3.447min
Succinic 4.115min
Acetic 4.536min
Propionic 5.072
Butyric 5.390min
Valeric 5.662min
Caproic 5.909min
Octanoic 6.336min

So if you want small differences in migration times from capillary to capillary you need to measure your capillary at the same length the same way each time

 

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