Chromatography Forum

Posted: **Sun Mar 15, 2009 10:49 am**

In extraction of cannabis from urie I used a mixture of ethyl acetate: diethyl ether (1:1). I notice in gc-ms it is alawys give a very high abundance peak of diisooctylphthalate!!

Posted: **Sun Mar 15, 2009 2:01 pm**

phthalates are everywhere. Any plastics in sample collection containers, tubing, or disposables associated with sample preparation? Those are potential sources close to the analysis.

Posted: **Mon Mar 16, 2009 3:01 pm**

Dear Che; Ftalatro de Dioctilo; is a platifier; and as Don says is in Anywhere;is very hard to eliminate as and is very sencitive too. you should try to run a several blanks and se if comes form your materials; use glasswares instead of plastic could be an option. and