Chromatography Forum

Hi ,, Empower again !
Anybody know how to use custom calculation special field for when a peak is not detected
I have a custom field for LOD and LOQ (using -60007 and 60009) but require this for when peak is not detected, -60002 for 'Not Detected'
ie
Amount/%w/w
8.0
2.0
BPQL (-60009)
BDL (-60007)
Not Detected (where this is a blank column in report at this time)

Any suggestions much appreciated

Hi there !!!

I am using Waters 996 with Empower software which is a good software.

I need some guideline .

Let me set the example for you.

Suppose i have a actual compound on wavelength is 230 with Mobile phase Meoh/h20 50:50.

Now we run the sample . The peak of interest appears with good resolution.

The question is that if somebody adds any impurity or anything other than my active compound in production process, how come i know that something is added in my sample .

Since i do not get any other response except my compound of interest with my mobile phase mixture at 230 nm.

Naturally the unknown impurity is not necesseraly will elute with my mobile phase combination and still i wish to know any other response within the spectral range of 200-400nm


Please guide me from this point

Thanks

Fareed Tayyeb
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Hi ,

Still no takers on this question ,

I thougth I would include Excel formula that I am using at the moment

=IF(G7="n.a.","Not Detected",IF(N7<0.03,"<ND",IF(N7<0.045,"<LOQ",N7)))

How would I include this using special values of Empower?
As I mentioned I do have this using special values for <LOQ and <LOD but when a peak is not present, thats the tricky part

Thanks