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Internal standard for organochlorinated pesticides
Posted: Wed Jul 27, 2011 1:34 am
by thohry
Hi all,
We are analyzing organochlorinated pesticides by GC-ECD with HP5-MS column . Now I want to use some internal standards to improve the quality. What compounds would you recommend to be the istd ?
Thanks
Re: Internal standard for organochlorinated pesticides
Posted: Tue Aug 02, 2011 4:04 pm
by tlahren
Are you using single or dual column? Which pesticides? I'm fairly certain you will find some answers on page 10 of this U.S. EPA method 8081.
http://www.accustandard.com/asi/pdfs/ep ... /8081B.pdf
Hope this helps,
Ty
Re: Internal standard for organochlorinated pesticides
Posted: Wed Aug 03, 2011 4:39 am
by thohry
Thank you very much. I use single column.
Re: Internal standard for organochlorinated pesticides
Posted: Wed Aug 03, 2011 12:17 pm
by tlahren
I always say 'The more, the merrier' with internal standards. I would use both of them if you can resolve them from other analytes and the two recommended surrogates are almost a necessity for GC/ECD. Many times in my past they have helped solve chromatographic issues as well as ensuring the integrity of the results.