By Kaoula on Sunday, July 4, 2004 - 12:14 am:

Hi ALL:

Please i need a clarification about the rule for choice between L7 coulmn and L1 coulmn ??
thank you ver match
Kaoula

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By Anonymous on Sunday, July 4, 2004 - 11:47 am:

Exactly what do you need clarified?

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By Kaoula on Wednesday, July 7, 2004 - 06:13 am:

Hi ALL:
What is the rule for the choice between L7 coulmn and L1 coulmn ??

thank you ver match
Kaoula

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By tom jupille on Wednesday, July 7, 2004 - 08:29 am:

L1 = C18
L7 = C8

If you are adapting a USP method, then you should use an "equivalent" column (i.e. one from the same "L" class as the column specified). The catch is that there are several hundred commercially available columns which fit the L1 description, and they are *not* all equivalent. It is up to you to demonstrate equivalence for the specific column you use.

If you are not dealing with a USP method, then the "L" designations are irrelevant.